diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..97c645a
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+Gemfile.lock
+**/*.swp
+coverage/
diff --git a/.rspec b/.rspec
new file mode 100644
index 0000000..3687797
--- /dev/null
+++ b/.rspec
@@ -0,0 +1,2 @@
+--require spec_helper
+--color
diff --git a/.rubocop.yml b/.rubocop.yml
new file mode 100644
index 0000000..be02188
--- /dev/null
+++ b/.rubocop.yml
@@ -0,0 +1,13 @@
+require: rubocop-rspec
+inherit_from: .rubocop_todo.yml
+
+AllCops:
+  TargetRubyVersion: 2.5
+
+RSpec/DescribeClass:
+  Exclude:
+    - 'spec/**/*_spec.rb'
+
+Metrics/BlockLength:
+  Exclude:
+    - 'spec/**/*_spec.rb'
diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
new file mode 100644
index 0000000..961b79d
--- /dev/null
+++ b/.rubocop_todo.yml
@@ -0,0 +1,606 @@
+# This configuration was generated by
+# `rubocop --auto-gen-config`
+# on 2019-11-26 16:32:38 +0000 using RuboCop version 0.73.0.
+# The point is for the user to remove these configuration records
+# one by one as the offenses are removed from the code base.
+# Note that changes in the inspected code, or installation of new
+# versions of RuboCop, may require this file to be generated again.
+
+# Offense count: 2
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, IndentationWidth.
+# SupportedStyles: with_first_argument, with_fixed_indentation
+Layout/AlignArguments:
+  Exclude:
+    - 'lib/gnuplot.rb'
+    - 'test/test_gnuplot.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+Layout/AlignArray:
+  Exclude:
+    - 'test/test_gnuplot.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+Layout/EmptyLineAfterGuardClause:
+  Exclude:
+    - 'lib/gnuplot.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+Layout/EmptyLineAfterMagicComment:
+  Exclude:
+    - 'ruby_gnuplot.gemspec'
+
+# Offense count: 2
+# Cop supports --auto-correct.
+# Configuration parameters: AllowAdjacentOneLineDefs, NumberOfEmptyLines.
+Layout/EmptyLineBetweenDefs:
+  Exclude:
+    - 'lib/gnuplot.rb'
+    - 'test/test_gnuplot.rb'
+
+# Offense count: 12
+# Cop supports --auto-correct.
+Layout/EmptyLines:
+  Exclude:
+    - 'lib/gnuplot.rb'
+    - 'test/test_gnuplot.rb'
+
+# Offense count: 10
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: empty_lines, no_empty_lines
+Layout/EmptyLinesAroundBlockBody:
+  Exclude:
+    - 'examples/multiple_data_sets.rb'
+    - 'test/arrtest.rb'
+    - 'test/multtest.rb'
+    - 'test/sinwave.rb'
+
+# Offense count: 11
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: empty_lines, empty_lines_except_namespace, empty_lines_special, no_empty_lines, beginning_only, ending_only
+Layout/EmptyLinesAroundClassBody:
+  Exclude:
+    - 'lib/gnuplot.rb'
+    - 'test/test_gnuplot.rb'
+
+# Offense count: 2
+# Cop supports --auto-correct.
+Layout/EmptyLinesAroundMethodBody:
+  Exclude:
+    - 'lib/gnuplot.rb'
+    - 'test/test_gnuplot.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: empty_lines, empty_lines_except_namespace, empty_lines_special, no_empty_lines
+Layout/EmptyLinesAroundModuleBody:
+  Exclude:
+    - 'lib/gnuplot.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: AllowForAlignment, AllowBeforeTrailingComments, ForceEqualSignAlignment.
+Layout/ExtraSpacing:
+  Exclude:
+    - 'test/test_gnuplot.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: IndentationWidth.
+Layout/IndentAssignment:
+  Exclude:
+    - 'lib/gnuplot.rb'
+
+# Offense count: 2
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: normal, indented_internal_methods
+Layout/IndentationConsistency:
+  Exclude:
+    - 'examples/multiple_data_sets.rb'
+    - 'lib/gnuplot.rb'
+
+# Offense count: 5
+# Cop supports --auto-correct.
+# Configuration parameters: Width, IgnoredPatterns.
+Layout/IndentationWidth:
+  Exclude:
+    - 'examples/3d_surface_plot.rb'
+    - 'lib/gnuplot.rb'
+
+# Offense count: 2
+# Cop supports --auto-correct.
+Layout/SpaceAfterComma:
+  Exclude:
+    - 'lib/gnuplot.rb'
+
+# Offense count: 13
+# Cop supports --auto-correct.
+Layout/SpaceAfterMethodName:
+  Exclude:
+    - 'lib/gnuplot.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: space, no_space
+Layout/SpaceAroundEqualsInParameterDefault:
+  Exclude:
+    - 'lib/gnuplot.rb'
+
+# Offense count: 6
+# Cop supports --auto-correct.
+# Configuration parameters: AllowForAlignment.
+Layout/SpaceAroundOperators:
+  Exclude:
+    - 'examples/discrete_points.rb'
+    - 'examples/multiple_data_sets.rb'
+    - 'ruby_gnuplot.gemspec'
+    - 'test/arrtest.rb'
+    - 'test/histtest.rb'
+    - 'test/multtest.rb'
+
+# Offense count: 4
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, EnforcedStyleForEmptyBraces.
+# SupportedStyles: space, no_space
+# SupportedStylesForEmptyBraces: space, no_space
+Layout/SpaceBeforeBlockBraces:
+  Exclude:
+    - 'examples/histogram.rb'
+    - 'lib/gnuplot.rb'
+
+# Offense count: 18
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, EnforcedStyleForEmptyBrackets.
+# SupportedStyles: space, no_space, compact
+# SupportedStylesForEmptyBrackets: space, no_space
+Layout/SpaceInsideArrayLiteralBrackets:
+  Exclude:
+    - 'lib/gnuplot.rb'
+    - 'test/test_gnuplot.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+Layout/SpaceInsideArrayPercentLiteral:
+  Exclude:
+    - 'examples/histogram.rb'
+
+# Offense count: 7
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, EnforcedStyleForEmptyBraces, SpaceBeforeBlockParameters.
+# SupportedStyles: space, no_space
+# SupportedStylesForEmptyBraces: space, no_space
+Layout/SpaceInsideBlockBraces:
+  Exclude:
+    - 'examples/histogram.rb'
+    - 'lib/gnuplot.rb'
+
+# Offense count: 120
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: space, no_space
+Layout/SpaceInsideParens:
+  Enabled: false
+
+# Offense count: 6
+# Cop supports --auto-correct.
+# Configuration parameters: IndentationWidth.
+Layout/Tab:
+  Exclude:
+    - 'examples/3d_surface_plot.rb'
+    - 'examples/multiple_data_sets.rb'
+    - 'lib/gnuplot.rb'
+    - 'test/test_gnuplot.rb'
+
+# Offense count: 7
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: final_newline, final_blank_line
+Layout/TrailingBlankLines:
+  Exclude:
+    - 'examples/histogram.rb'
+    - 'examples/sin_wave.rb'
+    - 'test/arrtest.rb'
+    - 'test/histtest.rb'
+    - 'test/multtest.rb'
+    - 'test/sinwave.rb'
+    - 'test/test_gnuplot.rb'
+
+# Offense count: 27
+# Cop supports --auto-correct.
+# Configuration parameters: AllowInHeredoc.
+Layout/TrailingWhitespace:
+  Exclude:
+    - 'examples/discrete_points.rb'
+    - 'examples/histogram.rb'
+    - 'examples/multiple_data_sets.rb'
+    - 'examples/output_image_file.rb'
+    - 'examples/sin_wave.rb'
+
+# Offense count: 1
+Lint/AmbiguousOperator:
+  Exclude:
+    - 'lib/gnuplot.rb'
+
+# Offense count: 2
+Lint/ShadowingOuterLocalVariable:
+  Exclude:
+    - 'test/test_gnuplot.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: IgnoreEmptyBlocks, AllowUnusedKeywordArguments.
+Lint/UnusedBlockArgument:
+  Exclude:
+    - 'test/histtest.rb'
+
+# Offense count: 1
+Lint/UselessAssignment:
+  Exclude:
+    - 'test/test_gnuplot.rb'
+
+# Offense count: 3
+Metrics/AbcSize:
+  Max: 23
+
+# Offense count: 9
+# Configuration parameters: CountComments, ExcludedMethods.
+# ExcludedMethods: refine
+Metrics/BlockLength:
+  Max: 143
+
+# Offense count: 1
+Metrics/CyclomaticComplexity:
+  Max: 13
+
+# Offense count: 8
+# Configuration parameters: CountComments, ExcludedMethods.
+Metrics/MethodLength:
+  Max: 22
+
+# Offense count: 1
+Metrics/PerceivedComplexity:
+  Max: 12
+
+# Offense count: 1
+# Configuration parameters: EnforcedStyleForLeadingUnderscores.
+# SupportedStylesForLeadingUnderscores: disallowed, required, optional
+Naming/MemoizedInstanceVariableName:
+  Exclude:
+    - 'Rakefile'
+
+# Offense count: 4
+# Configuration parameters: MinNameLength, AllowNamesEndingInNumbers, AllowedNames, ForbiddenNames.
+# AllowedNames: io, id, to, by, on, in, at, ip, db
+Naming/UncommunicativeMethodParamName:
+  Exclude:
+    - 'lib/gnuplot.rb'
+
+# Offense count: 1
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: snake_case, camelCase
+Naming/VariableName:
+  Exclude:
+    - 'lib/gnuplot.rb'
+
+# Offense count: 1
+Security/Eval:
+  Exclude:
+    - 'Rakefile'
+
+# Offense count: 16
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: prefer_alias, prefer_alias_method
+Style/Alias:
+  Exclude:
+    - 'lib/gnuplot.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: always, conditionals
+Style/AndOr:
+  Exclude:
+    - 'lib/gnuplot.rb'
+
+# Offense count: 6
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, ProceduralMethods, FunctionalMethods, IgnoredMethods, AllowBracesOnProceduralOneLiners.
+# SupportedStyles: line_count_based, semantic, braces_for_chaining, always_braces
+# ProceduralMethods: benchmark, bm, bmbm, create, each_with_object, measure, new, realtime, tap, with_object
+# FunctionalMethods: let, let!, subject, watch
+# IgnoredMethods: lambda, proc, it
+Style/BlockDelimiters:
+  Exclude:
+    - 'examples/multiple_data_sets.rb'
+    - 'lib/gnuplot.rb'
+    - 'test/multtest.rb'
+
+# Offense count: 2
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: is_a?, kind_of?
+Style/ClassCheck:
+  Exclude:
+    - 'lib/gnuplot.rb'
+
+# Offense count: 5
+# Cop supports --auto-correct.
+Style/ClassMethods:
+  Exclude:
+    - 'lib/gnuplot.rb'
+
+# Offense count: 9
+# Cop supports --auto-correct.
+Style/ColonMethodCall:
+  Exclude:
+    - 'lib/gnuplot.rb'
+    - 'test/test_gnuplot.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, SingleLineConditionsOnly, IncludeTernaryExpressions.
+# SupportedStyles: assign_to_condition, assign_inside_condition
+Style/ConditionalAssignment:
+  Exclude:
+    - 'lib/gnuplot.rb'
+
+# Offense count: 7
+Style/Documentation:
+  Exclude:
+    - 'spec/**/*'
+    - 'test/**/*'
+    - 'lib/gnuplot.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+Style/Encoding:
+  Exclude:
+    - 'ruby_gnuplot.gemspec'
+
+# Offense count: 9
+# Cop supports --auto-correct.
+Style/ExpandPathArguments:
+  Exclude:
+    - 'Rakefile'
+    - 'examples/3d_surface_plot.rb'
+    - 'examples/discrete_points.rb'
+    - 'examples/histogram.rb'
+    - 'examples/multiple_data_sets.rb'
+    - 'examples/output_image_file.rb'
+    - 'examples/sin_wave.rb'
+    - 'ruby_gnuplot.gemspec'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: each, for
+Style/For:
+  Exclude:
+    - 'lib/gnuplot.rb'
+
+# Offense count: 23
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: always, never
+Style/FrozenStringLiteralComment:
+  Enabled: false
+
+# Offense count: 1
+# Configuration parameters: MinBodyLength.
+Style/GuardClause:
+  Exclude:
+    - 'lib/gnuplot.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: UseHashRocketsWithSymbolValues, PreferHashRocketsForNonAlnumEndingSymbols.
+# SupportedStyles: ruby19, hash_rockets, no_mixed_keys, ruby19_no_mixed_keys
+Style/HashSyntax:
+  EnforcedStyle: hash_rockets
+
+# Offense count: 3
+# Cop supports --auto-correct.
+Style/IfUnlessModifier:
+  Exclude:
+    - 'lib/gnuplot.rb'
+
+# Offense count: 1
+Style/IfUnlessModifierOfIfUnless:
+  Exclude:
+    - 'lib/gnuplot.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: IgnoredMethods.
+Style/MethodCallWithoutArgsParentheses:
+  Exclude:
+    - 'test/histtest.rb'
+
+# Offense count: 2
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: require_parentheses, require_no_parentheses, require_no_parentheses_except_multiline
+Style/MethodDefParentheses:
+  Exclude:
+    - 'lib/gnuplot.rb'
+
+# Offense count: 1
+Style/MethodMissingSuper:
+  Exclude:
+    - 'lib/gnuplot.rb'
+
+# Offense count: 1
+Style/MissingRespondToMissing:
+  Exclude:
+    - 'lib/gnuplot.rb'
+
+# Offense count: 3
+# Cop supports --auto-correct.
+Style/MultilineIfThen:
+  Exclude:
+    - 'lib/gnuplot.rb'
+
+# Offense count: 3
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: literals, strict
+Style/MutableConstant:
+  Exclude:
+    - 'lib/gnuplot.rb'
+    - 'lib/ruby_gnuplot/version.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: both, prefix, postfix
+Style/NegatedIf:
+  Exclude:
+    - 'lib/gnuplot.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+Style/NestedModifier:
+  Exclude:
+    - 'lib/gnuplot.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+Style/Not:
+  Exclude:
+    - 'lib/gnuplot.rb'
+
+# Offense count: 18
+# Cop supports --auto-correct.
+# Configuration parameters: Strict.
+Style/NumericLiterals:
+  MinDigits: 7
+
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: AutoCorrect, EnforcedStyle, IgnoredMethods.
+# SupportedStyles: predicate, comparison
+Style/NumericPredicate:
+  Exclude:
+    - 'lib/gnuplot.rb'
+
+# Offense count: 3
+# Cop supports --auto-correct.
+# Configuration parameters: AllowSafeAssignment, AllowInMultilineConditions.
+Style/ParenthesesAroundCondition:
+  Exclude:
+    - 'lib/gnuplot.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: PreferredDelimiters.
+Style/PercentLiteralDelimiters:
+  Exclude:
+    - 'examples/histogram.rb'
+
+# Offense count: 3
+# Cop supports --auto-correct.
+# Configuration parameters: AllowMultipleReturnValues.
+Style/RedundantReturn:
+  Exclude:
+    - 'lib/gnuplot.rb'
+
+# Offense count: 5
+# Cop supports --auto-correct.
+Style/RedundantSelf:
+  Exclude:
+    - 'lib/gnuplot.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: use_perl_names, use_english_names
+Style/SpecialGlobalVars:
+  Exclude:
+    - 'ruby_gnuplot.gemspec'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+Style/StderrPuts:
+  Exclude:
+    - 'lib/gnuplot.rb'
+
+# Offense count: 235
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, ConsistentQuotesInMultiline.
+# SupportedStyles: single_quotes, double_quotes
+Style/StringLiterals:
+  Enabled: false
+
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: MinSize.
+# SupportedStyles: percent, brackets
+Style/SymbolArray:
+  EnforcedStyle: brackets
+
+# Offense count: 7
+# Cop supports --auto-correct.
+# Configuration parameters: IgnoredMethods.
+# IgnoredMethods: respond_to, define_method
+Style/SymbolProc:
+  Exclude:
+    - 'examples/discrete_points.rb'
+    - 'examples/histogram.rb'
+    - 'examples/multiple_data_sets.rb'
+    - 'lib/gnuplot.rb'
+    - 'test/arrtest.rb'
+    - 'test/multtest.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, AllowSafeAssignment.
+# SupportedStyles: require_parentheses, require_no_parentheses, require_parentheses_when_complex
+Style/TernaryParentheses:
+  Exclude:
+    - 'lib/gnuplot.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyleForMultiline.
+# SupportedStylesForMultiline: comma, consistent_comma, no_comma
+Style/TrailingCommaInArrayLiteral:
+  Exclude:
+    - 'examples/histogram.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: WordRegex.
+# SupportedStyles: percent, brackets
+Style/WordArray:
+  EnforcedStyle: percent
+  MinSize: 10
+
+# Offense count: 3
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: forbid_for_all_comparison_operators, forbid_for_equality_operators_only, require_for_all_comparison_operators, require_for_equality_operators_only
+Style/YodaCondition:
+  Exclude:
+    - 'test/test_gnuplot.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+Style/ZeroLengthPredicate:
+  Exclude:
+    - 'lib/gnuplot.rb'
+
+# Offense count: 9
+# Cop supports --auto-correct.
+# Configuration parameters: AutoCorrect, AllowHeredoc, AllowURI, URISchemes, IgnoreCopDirectives, IgnoredPatterns.
+# URISchemes: http, https
+Metrics/LineLength:
+  Max: 115
diff --git a/ChangeLog b/ChangeLog
index 4a9cdf9..0698188 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,12 @@
+2.6.1
+* TheKnight 	Fix bug in SPlot.to_gplot implementation. 
+
+2.6.0
+* better readme, allow for unsetting variables, thanks @kot-behemoth and @evnu
+
+2.5.0
+ * save output to instance variable, thanks for the patch.
+
 2.4.1
  * Quote escape more strings. Thanks for the tip!
 
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..8123674
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,17 @@
+FROM ruby:2.5.0 as base
+
+RUN apt-get update && apt-get install -y gnuplot
+
+RUN useradd -u 1000 gnuplot; \
+    mkdir -p /home/gnuplot/gnuplot; \
+    chown gnuplot.gnuplot -R /home/gnuplot
+
+WORKDIR /home/gnuplot/gnuplot
+
+USER gnuplot
+
+COPY lib/ ./lib/
+COPY *.gemspec ./
+COPY Gemfile ./
+
+RUN gem install bundler; bundle install
diff --git a/Gemfile b/Gemfile
new file mode 100644
index 0000000..3ef8ff9
--- /dev/null
+++ b/Gemfile
@@ -0,0 +1,4 @@
+source 'https://rubygems.org'
+
+# Specify your gem's dependencies in ruby_gnuplot.gemspec
+gemspec
diff --git a/README.textile b/README.textile
index 43b6773..3757e4e 100644
--- a/README.textile
+++ b/README.textile
@@ -14,71 +14,79 @@ h2.  History and Background
       been using it actively ever since. Now rdp maintains it.
       See also the changelog for more detail.
     
+h2.  Pre-requisites and Installation
+
+      1. (mac) Install XQuartz from here: 
+	     @http://xquartz.macosforge.org/landing/@
+	  
+	  2. Install gnuplot with homebrew (not OS X? install it using your package manager):
+	     @brew install gnuplot --with-x11@
+	  
+	  3. Install gnuplot gem:
+	     @gem install gnuplot@
+	  
 h2.  Ruby Gnuplot Concepts 
 
       Gnuplot has a very simple conceptual model.  Calls to _Set_ are
       made to set parameters and either _Plot_ or _Splot_ is
       called to generate the actual plot.  The _dataset_ to be 
-      plotted can be specified in a number of ways, contained in a seperate
+      plotted can be specified in a number of ways, contained in a separate
       file, generated from a function, read from standard input, or read
       immediately after the plot command.
     
 
       The object model for the Ruby gnuplot wrapper directly mimics this
-      layout and flow.  The following are the standard steps for generating a
+      layout and flow. The following are the standard steps for generating a
       plot:
     
     
-p.  Instantiate a Plot or Splot object and set parameters by gnuplot variable name. 
-p. Instantiate DataSet objects and attach Ruby objects containing
-	  the data to be plotted to the DataSet. Attach properties that modify
-	  the plot command using the modifier name.
+	  1.     Instantiate a @Plot@ or @Splot@ object and set parameters by gnuplot variable name. 
+
+	  2.     Instantiate @DataSet@ objects and attach Ruby objects containing the data to be plotted to the @DataSet@. Attach properties that modify the plot command using the modifier name.
       
-p. Send the Plot/Splot object to a Gnuplot instance for
-	  plotting.  
+	  3.     Send the @Plot@/@Splot@ object to a @Gnuplot@ instance for plotting.  
 
       The Version 2.0 interface makes very heavy use of blocks leading to very
       readable code.
     
-Gnuplot.open 
-
+@Gnuplot.open@
 
 bq. 
-      Instantiates a new Gnuplot process.  The path to the executable is
+      Instantiates a new Gnuplot process. The path to the executable is
       determined on a Unix or MacOSX system using the which command.  Windows
       users, I have no idea what to do.
       If a block is given to the function the opened process is passed into
-      the block.  This mimics the most common usage of the File.open method.
+      the block. This mimics the most common usage of the @File.open@ method.
     
-Plot.new 
+@Plot.new@ 
 
 
-SPlot.new
+@SPlot.new@
  
 bq. 
-      Create a new Plot or Splot object.  DataSets are attached to the object
+      Create a new @Plot@ or @SPlot@ object. @DataSet@ s are attached to the object
       to specify the data and its properties. 
       If a block is given to the function, the plot object is passed into the
       block.
     
-DataSet.new
+@DataSet.new@
 
 bq. 
       Associates a Ruby object containing the data to plot with the properties
-      that will be passed to the plot command for that dataset.  Any Ruby
-      object can be associated with a DataSet as long as it understands the
-      to_gplot method.
+      that will be passed to the plot command for that dataset. Any Ruby
+      object can be associated with a @DataSet@ as long as it understands the
+      @to_gplot@ method.
     
- to_gplot 
+@to_gplot@ 
  
 bq. 
       Within Gnuplot, plot data is read in very simple formats.  The
-      to_gplot method is expected to write the data of the object in a format
-      that is understandable by Gnuplot.  One of the many great things about
-      Ruby is that methods can be added after the original declaration.  The
-      gnuplot module defines the to_gplot method on the following classes:
-      Array, String, and Matrix.
-      Simply define a to_gplot method on your own class to tie the class into
+      @to_gplot@ method is expected to write the data of the object in a format
+      that is understandable by Gnuplot. One of the many great things about
+      Ruby is that methods can be added after the original declaration. The
+      gnuplot module defines the @to_gplot@ method on the following classes:
+      @Array@, @String@, and @Matrix@.
+      Simply define a @to_gplot@ method on your own class to tie the class into
       gnuplot.
     
 h2.  Examples 
@@ -89,26 +97,13 @@ h3.  Simple sin wave
 bq. The following example simply plots the value of sin(x) between the
       ranges of -10 and 10.  A few points to notice:
     
-p.  The code uses nested blocks to construct the plot.  The newly
-	  created object is passed to the block so it can be modified in
-	  place.
+*  The code uses nested blocks to construct the plot.  The newly created object is passed to the block so it can be modified in place.
       
-p.  Each of the gnuplot plot variables are modified using the 
-	  variable name as a method name on the plot object or on the dataset
-	  object.  The wrapper also takes care of the single quoting that is
-	  required on some of the variables like title, ylabel, and xlabel.
-	
+*  Each of the gnuplot plot variables are modified using the variable name as a method name on the plot object or on the dataset object.  The wrapper also takes care of the single quoting that is required on some of the variables like @title@, @ylabel@, and @xlabel@.
       
-p.  The plot object simply has an array of DataSets.  The
-	  constructor initializes this empty array before yielding to the
-	  block.  This method uses the << operator to add the DataSet to
-	  the plot.
-	
+*  The plot object simply has an array of @DataSet@s.  The constructor initializes this empty array before yielding to the block.  This method uses the @<<@ operator to add the @DataSet@ to the plot.
       
-p.  When the plot block ends, if an IO object is given to the Plot
-	  constructor, the plot commands will be written to the IO object.
-	  Any object can be passed to the constructor as long as it
-	  understands the << operator.
+*  When the plot block ends, if an @IO@ object is given to the @Plot@ constructor, the plot commands will be written to the @IO@ object.  Any object can be passed to the constructor as long as it understands the @<<@ operator.
 	  
 <pre>
 Gnuplot.open do |gp|
@@ -116,8 +111,8 @@ Gnuplot.open do |gp|
   
     plot.xrange "[-10:10]"
     plot.title  "Sin Wave Example"
-    plot.ylabel "x"
-    plot.xlabel "sin(x)"
+    plot.xlabel "x"
+    plot.ylabel "sin(x)"
     
     plot.data << Gnuplot::DataSet.new( "sin(x)" ) do |ds|
       ds.with = "lines"
@@ -130,21 +125,22 @@ end
 </pre>
 
 Or you can write it out to a file (the above snippet displays the graph, in Linux, but in windows you'd need to write it to a file).
-See the file examples/output_image_file.rb.
+
+See the file @examples/output_image_file.rb@.
 
 h3. Plotting discrete points
 
-Array data can be plotted quite easily since Arrays have a defined to_gplot method.
+Array data can be plotted quite easily since @Array@s have a defined @to_gplot@ method.
 
-Simply pass an array of data to the constructor of the DataSet object or set the data property of the DataSet. In this example, because there are two arrays, each array will be a single column of data to the gnuplot process.
+Simply pass an array of data to the constructor of the @DataSet@ object or set the data property of the @DataSet@. In this example, because there are two arrays, each array will be a single column of data to the gnuplot process.
 
 <pre>
 Gnuplot.open do |gp|
   Gnuplot::Plot.new( gp ) do |plot|
   
     plot.title  "Array Plot Example"
-    plot.ylabel "x"
-    plot.xlabel "x^2"
+    plot.xlabel "x"
+    plot.ylabel "x^2"
     
     x = (0..50).collect { |v| v.to_f }
     y = x.collect { |v| v ** 2 }
@@ -159,9 +155,9 @@ end
     
 h3. Multiple Data Sets
 
-As many data sets as are desired can be attached to a plot. Each of these can have their own plot modifiers. Notice in this example how the data array is explicitly set instead of using the << operator.
+As many data sets as are desired can be attached to a plot. Each of these can have their own plot modifiers. Notice in this example how the data array is explicitly set instead of using the @<<@ operator.
 
-Also in this example, the commands are not written to the Gnuplot process but are instead written to a File called gnuplot.dat. This file can later be run directly by a gnuplot process as it contains only the gnuplot commands.
+Also in this example, the commands are not written to the Gnuplot process but are instead written to a File called @gnuplot.dat@. This file can later be run directly by a gnuplot process as it contains only the gnuplot commands.
 
 <pre>
 File.open( "gnuplot.dat", "w") do |gp|
@@ -192,11 +188,19 @@ File.open( "gnuplot.dat", "w") do |gp|
 end
 </pre>    
 
+h3. Miscellanrous
+
 You can also add arbitrary lines to the output 
 
 <pre>
-plot.arbitrary_lines << "set ylabel \"y label" font \"Helvetica,20\""
+plot.arbitrary_lines << "set ylabel \"y label\" font \"Helvetica,20\""
 </pre>
 
 See more in the examples folder.  Also since this is basically just a wrapper for gnuplot itself, you should be able to do anything that it can do (demos: 
-http://gnuplot.sourceforge.net/demo_4.4/ ) 
\ No newline at end of file
+http://gnuplot.sourceforge.net/demo_4.4/ ) 
+
+h3. Security
+
+Note that if you pass any user-controlled strings to the gem, it's possible for an attacker to run arbitrary commands.
+
+In addition to title, any other graph properties that accept strings should be affected too.  they're all passed to the system command.  So only use strings you trust.
diff --git a/Rakefile b/Rakefile
index 5b8c3aa..bc3514b 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,10 +1,23 @@
-require 'jeweler'
-Jeweler::Tasks.new do |s|
-  s.name = 'gnuplot'
-  s.description = s.summary = "Utility library to aid in interacting with gnuplot from ruby"
-  s.version = "2.4.1"
-  s.authors='roger pack'
-  s.autorequire = 'gnuplot.rb'
-  s.email = "rogerpack2005@gmail.com"
-  s.homepage = "http://github.com/rdp/ruby_gnuplot/tree/master"
-end
\ No newline at end of file
+require "bundler/gem_tasks"
+require 'rake'
+require 'rake/clean'
+require 'rake/testtask'
+require 'rubygems/package_task'
+
+require_relative 'lib/ruby_gnuplot/version'
+
+desc 'run unit tests'
+task :default => :test
+
+Rake::TestTask.new do |t|
+  t.libs << "lib" << 'spec/support'
+  t.test_files = FileList['test/**/*.rb']
+  t.verbose = false
+  t.warning = false
+end
+
+def gemspec
+  @clean_gemspec ||= eval(File.read(File.expand_path('../ruby_gnuplot.gemspec', __FILE__)))
+end
+
+Gem::PackageTask.new(gemspec) { |pkg| }
diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 0000000..61d4e71
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,9 @@
+version: '3'
+services:
+  ruby_gnuplot:
+    build: .
+    working_dir: /home/gnuplot/gnuplot
+    container_name: ruby_gnuplot
+    command: /bin/bash
+    volumes:
+      - .:/home/gnuplot/gnuplot
diff --git a/examples/3d_surface_plot.rb b/examples/3d_surface_plot.rb
index 3c02451..942d8ce 100644
--- a/examples/3d_surface_plot.rb
+++ b/examples/3d_surface_plot.rb
@@ -1,3 +1,4 @@
+$LOAD_PATH.unshift(File.expand_path('../../lib', __FILE__))
 require "gnuplot"
 
 Gnuplot.open do |gp|
@@ -11,4 +12,4 @@
     ]
   end
   sleep 10
-end
\ No newline at end of file
+end
diff --git a/lib/gnuplot.rb b/lib/gnuplot.rb
index 92cd27f..21ca23d 100644
--- a/lib/gnuplot.rb
+++ b/lib/gnuplot.rb
@@ -1,21 +1,21 @@
 # Methods and variables for interacting with the gnuplot process.  Most of
 # these methods are for sending data to a gnuplot process, not for reading from
-# it.  Most of the methods are implemented as added methods to the built in 
+# it.  Most of the methods are implemented as added methods to the built in
 # classes.
 
 require 'matrix'
- 
+
 module Gnuplot
 
   # Trivial implementation of the which command that uses the PATH environment
   # variable to attempt to find the given application.  The application must
   # be executable and reside in one of the directories in the PATH environment
   # to be found.  The first match that is found will be returned.
-  # 
+  #
   # bin [String] The name of the executable to search for.
-  # 
+  #
   # Return the full path to the first match or nil if no match is found.
-  # 
+  #
   def Gnuplot.which ( bin )
     if RUBY_PLATFORM =~ /mswin|mingw/
       all = [bin, bin + '.exe']
@@ -41,59 +41,67 @@ def Gnuplot.which_helper bin
 
     # This is an implementation that works when the which command is
     # available.
-    # 
+    #
     # IO.popen("which #{bin}") { |io| return io.readline.chomp }
 
     return nil
-  end 
+  end
 
   # Find the path to the gnuplot executable.  The name of the executable can
   # be specified using the RB_GNUPLOT environment variable but will default to
-  # the command 'gnuplot'.  
-  # 
+  # the command 'gnuplot'.
+  #
   # persist [bool] Add the persist flag to the gnuplot executable
-  # 
+  #
   # Return the path to the gnuplot executable or nil if one cannot be found.
   def Gnuplot.gnuplot( persist = true )
-    cmd = '"' + which( ENV['RB_GNUPLOT'] || 'gnuplot' ) + '"'
-    raise 'gnuplot executable not found' unless cmd
+    exe_loc = which( ENV['RB_GNUPLOT'] || 'gnuplot' )
+    raise 'gnuplot executable not found on path' unless exe_loc
+    cmd = '"' + exe_loc + '"'
     cmd += " -persist" if persist
     cmd
   end
-    
+
   # Open a gnuplot process that exists in the current PATH.  If the persist
   # flag is true then the -persist flag is added to the command line.  The
-  # path to the gnuplot executable is determined using the 'which' command. 
+  # path to the gnuplot executable is determined using the 'which' command.
   #
   # See the gnuplot documentation for information on the persist flag.
   #
   # <b>todo</b> Add a method to pass the gnuplot path to the function.
-  
+
   def Gnuplot.open( persist=true )
-    cmd = Gnuplot.gnuplot( persist ) or raise 'gnuplot not found'
-    IO::popen( cmd, "w") { |io| yield io }
-  end 
-    
-    
+    cmd = Gnuplot.gnuplot( persist )
+    IO::popen( cmd, "w+") { |io|
+      yield io
+      io.close_write
+      @output = io.read
+    }
+    return @output
+  end
+
+
+
   # Holds command information and performs the formatting of that command
   # information to a Gnuplot process.  When constructing a new plot for
   # gnuplot, this is the first object that must be instantiated.  On this
   # object set the various properties and add data sets.
 
   class Plot
-    attr_accessor :cmd, :data, :sets
+    attr_accessor :cmd, :data, :settings
 
     QUOTED = [ "title", "output", "xlabel", "x2label", "ylabel", "y2label", "clabel", "cblabel", "zlabel" ]
 
     def initialize (io = nil, cmd = "plot")
       @cmd = cmd
-      @sets = []
+      @settings = []
       @arbitrary_lines = []
       @data = []
+      @styles = []
       yield self if block_given?
-      puts "writing this to gnuplot:\n" + to_gplot + "\n" if $VERBOSE
+      $stderr.puts "writing this to gnuplot:\n" + to_gplot + "\n" if $VERBOSE
 
-      if io    
+      if io
         io << to_gplot
         io << store_datasets
       end
@@ -111,14 +119,19 @@ def method_missing( methId, *args )
 
     # Set a variable to the given value.  +Var+ must be a gnuplot variable and
     # +value+ must be the value to set it to.  Automatic quoting will be
-    # performed if the variable requires it.  
+    # performed if the variable requires it.
     #
     # This is overloaded by the +method_missing+ method so see that for more
     # readable code.
 
     def set ( var, value = "" )
       value = "\"#{value}\"" if QUOTED.include? var unless value =~ /^'.*'$/
-      @sets << [ var, value ]
+      @settings << [ :set, var, value ]
+    end
+
+    # Unset a variable. +Var+ must be a gnuplot variable.
+    def unset ( var )
+        @settings << [ :unset, var ]
     end
 
 
@@ -127,10 +140,72 @@ def set ( var, value = "" )
     # gnuplot process.
 
     def [] ( var )
-      v = @sets.assoc( var )
-      v[1] || nil
+      v = @settings.reverse.rassoc( var )
+      if v.nil? or v.first == :unset
+          nil
+      else
+          v[2]
+      end
     end
 
+    class Style
+      attr_accessor :linestyle, :linetype, :linewidth, :linecolor,
+        :pointtype, :pointsize, :fill, :index
+
+      alias :ls :linestyle
+      alias :lt :linetype
+      alias :lw :linewidth
+      alias :lc :linecolor
+      alias :pt :pointtype
+      alias :ps :pointsize
+      alias :fs :fill
+
+      alias :ls= :linestyle=
+      alias :lt= :linetype=
+      alias :lw= :linewidth=
+      alias :lc= :linecolor=
+      alias :pt= :pointtype=
+      alias :ps= :pointsize=
+      alias :fs= :fill=
+
+      STYLES = [:ls, :lt, :lw, :lc, :pt, :ps, :fs]
+
+      def Style.increment_index
+        @index ||= 0
+        @index += 1
+
+        @index
+      end
+
+      def initialize
+        STYLES.each do |s|
+          send("#{s}=", nil)
+        end
+        yield self if block_given?
+
+        # only set the index if the user didn't do it
+        @index = Style::increment_index if index.nil?
+      end
+
+      def to_s
+        str = "set style line #{index}"
+        STYLES.each do |s|
+          style = send(s)
+          if not style.nil?
+            str << " #{s} #{style}"
+          end
+        end
+
+        str
+      end
+    end
+
+    # Create a gnuplot linestyle
+    def style &blk
+      s = Style.new &blk
+      @styles << s
+      s
+    end
 
     def add_data ( ds )
       @data << ds
@@ -138,7 +213,10 @@ def add_data ( ds )
 
 
     def to_gplot (io = "")
-      @sets.each { |var, val| io << "set #{var} #{val}\n" }
+      @settings.each do |setting|
+          io << setting.map(&:to_s).join(" ") << "\n"
+      end
+      @styles.each{|s| io << s.to_s << "\n"}
       @arbitrary_lines.each{|line| io << line << "\n" }
 
       io
@@ -152,21 +230,25 @@ def store_datasets (io = "")
         v = @data.collect { |ds| ds.to_gplot }
       	io << v.compact.join("e\n")
       end
-      
+
       io
     end
   end
 
+  # Analogous to Plot class, holds command information and performs the formatting of that command
+  # information to a Gnuplot process. Should be used when for drawing 3D plots.
+
   class SPlot < Plot
 
     def initialize (io = nil, cmd = "splot")
       super
     end
-    
-    def to_gplot (io = "")
-      @sets.each { |var, val| io << "set #{var} #{val}\n" }
 
-      io
+    # Currently using the implementation from parent class Plot.
+    # Leaving the method explicit here, though, as to allow an specific
+    # implementation for SPlot in the future.
+    def to_gplot (io = "")
+      super
     end
 
   end
@@ -176,7 +258,7 @@ def to_gplot (io = "")
   # has a reference to the actual data being plotted as well as settings that
   # control the "plot" command.  The data object must support the to_gplot
   # command.
-  # 
+  #
   # +data+ The data that will be plotted.  The only requirement is that the
   # object understands the to_gplot method.
   #
@@ -187,39 +269,47 @@ def to_gplot (io = "")
   #
   # @todo Use the delegator to delegate to the data property.
 
-  class DataSet 
-    attr_accessor :title, :with, :using, :data, :linewidth, :matrix, :smooth, :axes
-  
+  class DataSet
+    attr_accessor :title, :with, :using, :data, :linewidth, :linecolor, :matrix, :smooth, :axes, :index, :linestyle
+
+    alias :ls :linestyle
+    alias :ls= :linestyle=
+
     def initialize (data = nil)
       @data = data
-      @title = @with = @using = @linewidth = @matrix = @smooth = @axes = nil # avoid warnings
+      @linestyle = @title = @with = @using = @linewidth = @linecolor = @matrix =
+          @smooth = @axes = @index = nil # avoid warnings
       yield self if block_given?
     end
-        
+
     def notitle
       @title = "notitle"
     end
 
     def plot_args (io = "")
-      
+
       # Order of these is important or gnuplot barfs on 'em
 
       io << ( (@data.instance_of? String) ? @data : "'-'" )
 
+      io << " index #{@index}" if @index
+
       io << " using #{@using}" if @using
-     
+
       io << " axes #{@axes}" if @axes
- 
+
       io << case @title
             when /notitle/ then " notitle"
             when nil       then ""
-            else " title '#{@title}'" 
+            else " title '#{@title}'"
             end
 
       io << " matrix" if @matrix
       io << " smooth #{@smooth}" if @smooth
       io << " with #{@with}" if @with
+      io << " linecolor #{@linecolor}" if @linecolor
       io << " linewidth #{@linewidth}" if @linewidth
+      io << " linestyle #{@linestyle.index}" if @linestyle
       io
     end
 
@@ -238,19 +328,20 @@ def to_gsplot
       else @data.to_gsplot
       end
     end
-    
+
   end
 end
 
 class Array
   def to_gplot
-    if ( self[0].kind_of? Array ) then
+    return "" if self.empty?
+
+    case self[0]
+    when Array
       tmp = self[0].zip( *self[1..-1] )
       tmp.collect { |a| a.join(" ") }.join("\n") + "\ne"
-    elsif ( self[0].kind_of? Numeric ) then
-      s = ""
-      self.length.times { |i| s << "#{self[i]}\n" }
-      s
+    when Numeric
+      self.join("\n")
     else
       self[0].zip( *self[1..-1] ).to_gplot
     end
@@ -258,7 +349,7 @@ def to_gplot
 
   def to_gsplot
     f = ""
-    
+
     if ( self[0].kind_of? Array ) then
       x = self[0]
       y = self[1]
@@ -275,16 +366,16 @@ def to_gsplot
     else
       self[0].zip( *self[1..-1] ).to_gsplot
     end
-    
+
     f
   end
 end
-   
+
 class Matrix
   def to_gplot (x = nil, y = nil)
     xgrid = x || (0...self.column_size).to_a
     ygrid = y || (0...self.row_size).to_a
-  
+
     f = ""
     ygrid.length.times do |j|
       y = ygrid[j]
@@ -294,7 +385,7 @@ def to_gplot (x = nil, y = nil)
         end
       end
     end
-    
+
     f
   end
 
diff --git a/lib/ruby_gnuplot/version.rb b/lib/ruby_gnuplot/version.rb
new file mode 100644
index 0000000..ba6c60b
--- /dev/null
+++ b/lib/ruby_gnuplot/version.rb
@@ -0,0 +1,3 @@
+module RubyGnuplot
+  VERSION = "2.6.1"
+end
diff --git a/ruby_gnuplot.gemspec b/ruby_gnuplot.gemspec
new file mode 100644
index 0000000..97239a1
--- /dev/null
+++ b/ruby_gnuplot.gemspec
@@ -0,0 +1,25 @@
+# coding: utf-8
+lib = File.expand_path('../lib', __FILE__)
+$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
+require 'ruby_gnuplot/version'
+
+Gem::Specification.new do |s|
+  s.name = 'gnuplot'
+  s.description = s.summary = "Utility library to aid in interacting with gnuplot from ruby"
+  s.version = RubyGnuplot::VERSION
+  s.authors='roger pack'
+  s.email = "rogerpack2005@gmail.com"
+  s.homepage = "http://github.com/rdp/ruby_gnuplot/tree/master"
+  s.license = "BSD"
+
+  s.files         = `git ls-files`.split($/)
+  s.executables   = s.files.grep(%r{^bin/}) { |f| File.basename(f) }
+  s.test_files    = s.files.grep(%r{^(test|spec|features)/})
+  s.require_paths = ["lib"]
+
+  s.add_development_dependency 'minitest'
+  s.add_development_dependency 'rspec',         '3.9.0'
+  s.add_development_dependency 'rubocop',       '0.73.0'
+  s.add_development_dependency 'rubocop-rspec', '1.33.0'
+  s.add_development_dependency 'simplecov',     '0.17.0'
+end
diff --git a/spec/fixtures/plots/array_plot.eps b/spec/fixtures/plots/array_plot.eps
new file mode 100644
index 0000000..98b8de1
--- /dev/null
+++ b/spec/fixtures/plots/array_plot.eps
@@ -0,0 +1,810 @@
+%!PS-Adobe-2.0 EPSF-2.0
+%%Title: spec/tmp/array_plot.eps
+%%Creator: gnuplot 5.0 patchlevel 5
+%%CreationDate: Wed Nov  6 21:24:07 2019
+%%DocumentFonts: (atend)
+%%BoundingBox: 50 50 410 302
+%%EndComments
+%%BeginProlog
+/gnudict 256 dict def
+gnudict begin
+%
+% The following true/false flags may be edited by hand if desired.
+% The unit line width and grayscale image gamma correction may also be changed.
+%
+/Color false def
+/Blacktext false def
+/Solid false def
+/Dashlength 1 def
+/Landscape false def
+/Level1 false def
+/Level3 false def
+/Rounded false def
+/ClipToBoundingBox false def
+/SuppressPDFMark false def
+/TransparentPatterns false def
+/gnulinewidth 5.000 def
+/userlinewidth gnulinewidth def
+/Gamma 1.0 def
+/BackgroundColor {-1.000 -1.000 -1.000} def
+%
+/vshift -46 def
+/dl1 {
+  10.0 Dashlength userlinewidth gnulinewidth div mul mul mul
+  Rounded { currentlinewidth 0.75 mul sub dup 0 le { pop 0.01 } if } if
+} def
+/dl2 {
+  10.0 Dashlength userlinewidth gnulinewidth div mul mul mul
+  Rounded { currentlinewidth 0.75 mul add } if
+} def
+/hpt_ 31.5 def
+/vpt_ 31.5 def
+/hpt hpt_ def
+/vpt vpt_ def
+/doclip {
+  ClipToBoundingBox {
+    newpath 50 50 moveto 410 50 lineto 410 302 lineto 50 302 lineto closepath
+    clip
+  } if
+} def
+%
+% Gnuplot Prolog Version 5.1 (Oct 2015)
+%
+%/SuppressPDFMark true def
+%
+/M {moveto} bind def
+/L {lineto} bind def
+/R {rmoveto} bind def
+/V {rlineto} bind def
+/N {newpath moveto} bind def
+/Z {closepath} bind def
+/C {setrgbcolor} bind def
+/f {rlineto fill} bind def
+/g {setgray} bind def
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diff --git a/spec/integration/arrtest_spec.rb b/spec/integration/arrtest_spec.rb
new file mode 100644
index 0000000..49485f4
--- /dev/null
+++ b/spec/integration/arrtest_spec.rb
@@ -0,0 +1,42 @@
+describe "Array Plot Example" do
+  let(:file_path)    { 'spec/tmp/array_plot.eps' }
+  let(:fixture_path) { 'spec/fixtures/plots/array_plot.eps' }
+
+  let(:file_content) do
+    File.read(file_path).gsub(/CreationDate.*/, "")
+  end
+
+  let(:fixture_content) do
+    File.read(fixture_path).gsub(/CreationDate.*/, "")
+  end
+
+  before do
+    path = file_path
+
+    Gnuplot.open do |gp|
+      Gnuplot::Plot.new( gp ) do |plot|
+        plot.title  "Array Plot Example"
+        plot.ylabel "x"
+        plot.xlabel "x^2"
+        plot.term   "postscript eps"
+        plot.output path
+
+        x = (0..50).collect(&:to_f)
+        y = x.collect { |v| v**2 }
+
+        plot.data << Gnuplot::DataSet.new( [x, y] ) do |ds|
+          ds.with = "linespoints"
+          ds.notitle
+        end
+      end
+    end
+  end
+
+  after do
+    File.delete(file_path)
+  end
+
+  it "plots expected file" do
+    expect(file_content).to eq(fixture_content)
+  end
+end
diff --git a/spec/integration/histtest_spec.rb b/spec/integration/histtest_spec.rb
new file mode 100644
index 0000000..7301023
--- /dev/null
+++ b/spec/integration/histtest_spec.rb
@@ -0,0 +1,49 @@
+describe "Histogram Plot Example" do
+  let(:file_path)    { 'spec/tmp/histogram_plot.eps' }
+  let(:fixture_path) { 'spec/fixtures/plots/histogram_plot.eps' }
+
+  let(:file_content) do
+    File.read(file_path).gsub(/CreationDate.*/, "")
+  end
+
+  let(:fixture_content) do
+    File.read(fixture_path).gsub(/CreationDate.*/, "")
+  end
+
+  before do
+    path = file_path
+    RandomGenerator.seed(0.17)
+
+    collection = (0..500).collect do
+      (RandomGenerator.rand - 0.5)**3
+    end
+
+    Gnuplot.open do |gp|
+      gp << "bin(x, s) = s*int(x/s)\n"
+
+      Gnuplot::Plot.new( gp ) do |plot|
+        plot.title  "Histogram"
+        plot.xlabel "x"
+        plot.ylabel "frequency"
+
+        plot.data << Gnuplot::DataSet.new( [collection] ) do |ds|
+          ds.title = "smooth frequency"
+          ds.using = "(bin($1,.01)):(1.)"
+          ds.smooth = "freq"
+          ds.with = "boxes"
+        end
+
+        plot.term   "postscript eps"
+        plot.output path
+      end
+    end
+  end
+
+  after do
+    File.delete(file_path)
+  end
+
+  it "plots expected file" do
+    expect(file_content).to eq(fixture_content)
+  end
+end
diff --git a/spec/integration/multtest_spec.rb b/spec/integration/multtest_spec.rb
new file mode 100644
index 0000000..3da4043
--- /dev/null
+++ b/spec/integration/multtest_spec.rb
@@ -0,0 +1,52 @@
+describe "Multtest Plot Example" do
+  let(:file_path)    { 'spec/tmp/multtest_plot.eps' }
+  let(:fixture_path) { 'spec/fixtures/plots/multtest_plot.eps' }
+
+  let(:file_content) do
+    File.read(file_path).gsub(/CreationDate.*/, "")
+  end
+
+  let(:fixture_content) do
+    File.read(fixture_path).gsub(/CreationDate.*/, "")
+  end
+
+  before do
+    path = file_path
+
+    Gnuplot.open do |gp|
+      Gnuplot::Plot.new( gp ) do |plot|
+        plot.xrange "[-10:10]"
+        plot.title  "Sin Wave Example"
+        plot.ylabel "x"
+        plot.xlabel "sin(x)"
+
+        plot.term   "postscript eps"
+        plot.output path
+
+        x = (0..50).collect(&:to_f)
+        y = x.collect { |v| v**2 }
+
+        plot.data = [
+          Gnuplot::DataSet.new( "sin(x)" ) do |ds|
+            ds.with = "lines"
+            ds.title = "String function"
+            ds.linewidth = 4
+          end,
+
+          Gnuplot::DataSet.new( [x, y] ) do |ds|
+            ds.with = "linespoints"
+            ds.title = "Array data"
+          end
+        ]
+      end
+    end
+  end
+
+  after do
+    File.delete(file_path)
+  end
+
+  it "plots expected file" do
+    expect(file_content).to eq(fixture_content)
+  end
+end
diff --git a/spec/integration/sinwave_spec.rb b/spec/integration/sinwave_spec.rb
new file mode 100644
index 0000000..c27e7f5
--- /dev/null
+++ b/spec/integration/sinwave_spec.rb
@@ -0,0 +1,41 @@
+describe "Sin Wave Plot Example" do
+  let(:file_path)    { 'spec/tmp/sin_wave_plot.eps' }
+  let(:fixture_path) { 'spec/fixtures/plots/sin_wave_plot.eps' }
+
+  let(:file_content) do
+    File.read(file_path).gsub(/CreationDate.*/, "")
+  end
+
+  let(:fixture_content) do
+    File.read(fixture_path).gsub(/CreationDate.*/, "")
+  end
+
+  before do
+    path = file_path
+
+    Gnuplot.open do |gp|
+      Gnuplot::Plot.new( gp ) do |plot|
+        plot.xrange "[-10:10]"
+        plot.title  "Sin Wave Example"
+        plot.ylabel "x"
+        plot.xlabel "sin(x)"
+
+        plot.term   "postscript eps"
+        plot.output path
+
+        plot.data << Gnuplot::DataSet.new( "sin(x)" ) do |ds|
+          ds.with = "lines"
+          ds.linewidth = 4
+        end
+      end
+    end
+  end
+
+  after do
+    File.delete(file_path)
+  end
+
+  it "plots expected file" do
+    expect(file_content).to eq(fixture_content)
+  end
+end
diff --git a/spec/lib/ruby_gnuplot/data_set_spec.rb b/spec/lib/ruby_gnuplot/data_set_spec.rb
new file mode 100644
index 0000000..efb96f8
--- /dev/null
+++ b/spec/lib/ruby_gnuplot/data_set_spec.rb
@@ -0,0 +1,89 @@
+require 'spec_helper'
+
+describe Gnuplot::DataSet do
+  subject(:data_set) { described_class.new(data) }
+
+  let(:data) { nil }
+
+  describe '#to_gplot' do
+    context 'when data is an empty array' do
+      let(:data) { [] }
+
+      it do
+        expect(data_set.to_gplot).to eq('')
+      end
+    end
+
+    context 'when data is an array of numbers' do
+      let(:data) { [1, 10.0, 2.3] }
+
+      it 'converts to gplot format' do
+        expect(data_set.to_gplot).to eq("1\n10.0\n2.3")
+      end
+    end
+
+    context 'when data is a matrix of numbers' do
+      let(:data) { [[1, 10.0], [0, 2]] }
+
+      it 'converts to gplot matrix format' do
+        expect(data_set.to_gplot).to eq("1 0\n10.0 2\ne")
+      end
+    end
+
+    context 'when data is a string' do
+      let(:data) { 'x' }
+
+      it do
+        expect(data_set.to_gplot).to be_nil
+      end
+    end
+
+    context 'when data is an instance of Matrix' do
+      xit 'to be implemented'
+    end
+
+    context 'when data is nil' do
+      it do
+        expect(data_set.to_gplot).to be_nil
+      end
+
+      it 'assigns data' do
+        expect(data_set.data).to eq(data)
+      end
+    end
+
+    context 'when setting attributes in a block' do
+      subject(:data_set) do
+        described_class.new do |ds|
+          ds.with  = 'lines'
+          ds.using = '1:2'
+          ds.data = [ [0, 1, 2], [1, 2, 5] ]
+        end
+      end
+
+      it 'returns only the data' do
+        expect(data_set.to_gplot)
+          .to eq("0 1\n1 2\n2 5\ne")
+      end
+    end
+  end
+
+  describe '#plot_args' do
+    context 'when setting attributes on initialize block' do
+      subject(:data_set) do
+        described_class.new do |ds|
+          ds.with  = 'lines'
+          ds.using = '1:2'
+          ds.data = data
+        end
+      end
+
+      let(:data) { [ [0, 1, 2], [1, 2, 5] ] }
+
+      it 'returns plot attributes' do
+        expect(data_set.plot_args)
+          .to eq("'-' using 1:2 with lines")
+      end
+    end
+  end
+end
diff --git a/spec/lib/ruby_gnuplot/plot/style_spec.rb b/spec/lib/ruby_gnuplot/plot/style_spec.rb
new file mode 100644
index 0000000..b80f845
--- /dev/null
+++ b/spec/lib/ruby_gnuplot/plot/style_spec.rb
@@ -0,0 +1,66 @@
+describe Gnuplot::Plot::Style do
+  subject(:style) { described_class.new }
+
+  let(:index) { style.index }
+
+  describe '#to_s' do
+    context "when nothing has been set" do
+      it 'creates an empty style' do
+        expect(style.to_s).to eq("set style line #{index}")
+      end
+    end
+
+    context 'when setting the stype' do
+      before do
+        style.ls = 1
+        style.lw = 2
+        style.lc = 3
+        style.pt = 4
+        style.ps = 5
+        style.fs = 6
+      end
+
+      it 'creates and indexes the style' do
+        expect(style.to_s).to eq(
+          "set style line #{index} ls 1 lw 2 lc 3 pt 4 ps 5 fs 6"
+        )
+      end
+    end
+
+    context 'when setting the stype on initialize' do
+      subject(:style) do
+        described_class.new do |style|
+          style.ls = 1
+          style.lw = 2
+          style.lc = 3
+          style.pt = 4
+          style.ps = 5
+          style.fs = 6
+        end
+      end
+
+      it 'creates and indexes the style' do
+        expect(style.to_s).to eq(
+          "set style line #{index} ls 1 lw 2 lc 3 pt 4 ps 5 fs 6"
+        )
+      end
+    end
+
+    context 'when setting using the full method name' do
+      before do
+        style.linestyle = 1
+        style.linewidth = 2
+        style.linecolor = 3
+        style.pointtype = 4
+        style.pointsize = 5
+        style.fill      = 6
+      end
+
+      it 'creates and indexes the style' do
+        expect(style.to_s).to eq(
+          "set style line #{index} ls 1 lw 2 lc 3 pt 4 ps 5 fs 6"
+        )
+      end
+    end
+  end
+end
diff --git a/spec/lib/ruby_gnuplot/plot_spec.rb b/spec/lib/ruby_gnuplot/plot_spec.rb
new file mode 100644
index 0000000..49e4279
--- /dev/null
+++ b/spec/lib/ruby_gnuplot/plot_spec.rb
@@ -0,0 +1,216 @@
+shared_examples 'quotes value when setting in a plot for' do |field|
+  describe "##{field}" do
+    before do
+      plot.public_send(field, 'text')
+    end
+
+    let(:expected_settings) do
+      [
+        [:set, field.to_s, '"text"'],
+        [:set, field.to_s, '"new text"']
+      ]
+    end
+
+    it 'quotes value when setting it' do
+      expect(plot.to_gplot).to eq("set #{field} \"text\"\n")
+    end
+
+    it 'enquees into settings' do
+      expect { plot.public_send(field, 'new text') }
+        .to change(plot, :settings)
+        .from([[:set, field.to_s, '"text"']])
+        .to(expected_settings)
+    end
+  end
+end
+
+describe Gnuplot::Plot do
+  subject(:plot) { described_class.new }
+
+  describe '#to_gplot' do
+    let(:expected_string) do
+      [
+        'set title "Array Plot Example"',
+        'set ylabel "x"',
+        'set xlabel "x^2"',
+        'set term postscript eps',
+        'set output "file.eps"',
+        ''
+      ].join("\n")
+    end
+
+    context 'when nothing has been set' do
+      it "returns an empty string" do
+        expect(plot.to_gplot).to eq('')
+      end
+    end
+
+    context 'when titles and labels have been set' do
+      before do
+        plot.title  "Array Plot Example"
+        plot.ylabel "x"
+        plot.xlabel "x^2"
+        plot.term   "postscript eps"
+        plot.output "file.eps"
+      end
+
+      it "wraps strings with quotes when needed" do
+        expect(plot.to_gplot).to eq(expected_string)
+      end
+    end
+
+    context 'when variables are set throgh set call' do
+      before do
+        plot.set "title",  "Array Plot Example"
+        plot.set "ylabel", "x"
+        plot.set "xlabel", "x^2"
+        plot.set "term",   "postscript eps"
+        plot.set "output", "file.eps"
+      end
+
+      it "wraps strings with quotes when needed" do
+        expect(plot.to_gplot).to eq(expected_string)
+      end
+    end
+
+    context "when setting from inside initialization" do
+      subject(:plot) do
+        described_class.new do |p|
+          p.title  "Array Plot Example"
+          p.ylabel "x"
+          p.xlabel "x^2"
+          p.term   "postscript eps"
+          p.output "file.eps"
+        end
+      end
+
+      it "wraps strings with quotes when needed" do
+        expect(plot.to_gplot).to eq(expected_string)
+      end
+    end
+  end
+
+  it_behaves_like 'quotes value when setting in a plot for', :title
+  it_behaves_like 'quotes value when setting in a plot for', :output
+  it_behaves_like 'quotes value when setting in a plot for', :xlabel
+  it_behaves_like 'quotes value when setting in a plot for', :x2label
+  it_behaves_like 'quotes value when setting in a plot for', :ylabel
+  it_behaves_like 'quotes value when setting in a plot for', :y2label
+  it_behaves_like 'quotes value when setting in a plot for', :clabel
+  it_behaves_like 'quotes value when setting in a plot for', :cblabel
+  it_behaves_like 'quotes value when setting in a plot for', :zlabel
+
+  describe '#unset' do
+    let(:expected_string) do
+      [
+        'set title "My Title"',
+        'unset title',
+        ''
+      ].join("\n")
+    end
+
+    before do
+      plot.title 'My Title'
+    end
+
+    it 'changes value in current settings' do
+      expect { plot.unset 'title' }
+        .to change { plot['title'] }
+        .from('"My Title"').to(nil)
+    end
+
+    it 'unsets key on output' do
+      plot.unset 'title'
+      expect(plot.to_gplot).to eq(expected_string)
+    end
+  end
+
+  describe '#[]' do
+    context 'when value was never set' do
+      it { expect(plot['key']).to be_nil }
+    end
+
+    context 'when value was only unset' do
+      before { plot.unset 'title' }
+
+      it { expect(plot['title']).to be_nil }
+    end
+
+    context 'when value was set only once' do
+      before { plot.title "My Title" }
+
+      it "returns the value to be used (quoted when needed)" do
+        expect(plot['title']).to eq('"My Title"')
+      end
+    end
+
+    context 'when value was set twice' do
+      before do
+        plot.title "My Title"
+        plot.title "My New Title"
+      end
+
+      it "returns the last value set" do
+        expect(plot['title']).to eq('"My New Title"')
+      end
+    end
+
+    context 'when value was set then unset' do
+      before do
+        plot.title "My Title"
+        plot.unset "title"
+      end
+
+      it { expect(plot['title']).to be_nil }
+    end
+
+    context 'when value was set, unset and set again' do
+      before do
+        plot.title "My Title"
+        plot.unset "title"
+        plot.title "My New Title"
+      end
+
+      it "returns the last value set" do
+        expect(plot['title']).to eq('"My New Title"')
+      end
+    end
+  end
+
+  describe 'method missing' do
+    it 'delegates to set call' do
+      expect { plot.fake_field('value') }
+        .to change(plot, :settings)
+        .from([])
+        .to([[:set, 'fake_field', 'value']])
+    end
+
+    context 'when field should be quoted' do
+      it 'delegates to set call and quote it' do
+        expect { plot.output('value') }
+          .to change(plot, :settings)
+          .from([])
+          .to([[:set, 'output', '"value"']])
+      end
+    end
+  end
+
+  describe '#style' do
+    subject(:plot) do
+      described_class.new do |p|
+        p.title 'My title'
+        p.style do |style|
+          style.ls = 1
+        end
+      end
+    end
+
+    let(:expected_output) do
+      /^set title "My title"\nset style line \d+ ls 1\n$/
+    end
+
+    it 'adds style to gplot output' do
+      expect(plot.to_gplot).to match(expected_output)
+    end
+  end
+end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
new file mode 100644
index 0000000..e2940fd
--- /dev/null
+++ b/spec/spec_helper.rb
@@ -0,0 +1,109 @@
+# This file was generated by the `rspec --init` command. Conventionally, all
+# specs live under a `spec` directory, which RSpec adds to the `$LOAD_PATH`.
+# The generated `.rspec` file contains `--require spec_helper` which will cause
+# this file to always be loaded, without a need to explicitly require it in any
+# files.
+#
+# Given that it is always loaded, you are encouraged to keep this file as
+# light-weight as possible. Requiring heavyweight dependencies from this file
+# will add to the boot time of your test suite on EVERY test run, even for an
+# individual file that may not need all of that loaded. Instead, consider making
+# a separate helper file that requires the additional dependencies and performs
+# the additional setup, and require it from the spec files that actually need
+# it.
+#
+# See http://rubydoc.info/gems/rspec-core/RSpec/Core/Configuration
+require 'simplecov'
+SimpleCov.start do
+  add_filter '/spec/'
+end
+
+require "gnuplot"
+
+support_files = File.expand_path('spec/support/**/*.rb')
+
+Dir[support_files].sort.each { |file| require file }
+
+RSpec.configure do |config|
+  # rspec-expectations config goes here. You can use an alternate
+  # assertion/expectation library such as wrong or the stdlib/minitest
+  # assertions if you prefer.
+  config.expect_with :rspec do |expectations|
+    # This option will default to `true` in RSpec 4. It makes the `description`
+    # and `failure_message` of custom matchers include text for helper methods
+    # defined using `chain`, e.g.:
+    #     be_bigger_than(2).and_smaller_than(4).description
+    #     # => "be bigger than 2 and smaller than 4"
+    # ...rather than:
+    #     # => "be bigger than 2"
+    expectations.include_chain_clauses_in_custom_matcher_descriptions = true
+  end
+
+  # rspec-mocks config goes here. You can use an alternate test double
+  # library (such as bogus or mocha) by changing the `mock_with` option here.
+  config.mock_with :rspec do |mocks|
+    # Prevents you from mocking or stubbing a method that does not exist on
+    # a real object. This is generally recommended, and will default to
+    # `true` in RSpec 4.
+    mocks.verify_partial_doubles = true
+  end
+
+  # This option will default to `:apply_to_host_groups` in RSpec 4 (and will
+  # have no way to turn it off -- the option exists only for backwards
+  # compatibility in RSpec 3). It causes shared context metadata to be
+  # inherited by the metadata hash of host groups and examples, rather than
+  # triggering implicit auto-inclusion in groups with matching metadata.
+  config.shared_context_metadata_behavior = :apply_to_host_groups
+
+  # The settings below are suggested to provide a good initial experience
+  # with RSpec, but feel free to customize to your heart's content.
+  #   # This allows you to limit a spec run to individual examples or groups
+  #   # you care about by tagging them with `:focus` metadata. When nothing
+  #   # is tagged with `:focus`, all examples get run. RSpec also provides
+  #   # aliases for `it`, `describe`, and `context` that include `:focus`
+  #   # metadata: `fit`, `fdescribe` and `fcontext`, respectively.
+  #   config.filter_run_when_matching :focus
+  #
+  #   # Allows RSpec to persist some state between runs in order to support
+  #   # the `--only-failures` and `--next-failure` CLI options. We recommend
+  #   # you configure your source control system to ignore this file.
+  #   config.example_status_persistence_file_path = "spec/examples.txt"
+  #
+  #   # Limits the available syntax to the non-monkey patched syntax that is
+  #   # recommended. For more details, see:
+  #   #   - http://rspec.info/blog/2012/06/rspecs-new-expectation-syntax/
+  #   #   - http://www.teaisaweso.me/blog/2013/05/27/rspecs-new-message-expectation-syntax/
+  #   #   - http://rspec.info/blog/2014/05/notable-changes-in-rspec-3/#zero-monkey-patching-mode
+  #   config.disable_monkey_patching!
+  #
+  #   # This setting enables warnings. It's recommended, but in some cases may
+  #   # be too noisy due to issues in dependencies.
+  #   config.warnings = true
+  #
+  #   # Many RSpec users commonly either run the entire suite or an individual
+  #   # file, and it's useful to allow more verbose output when running an
+  #   # individual spec file.
+  #   if config.files_to_run.one?
+  #     # Use the documentation formatter for detailed output,
+  #     # unless a formatter has already been configured
+  #     # (e.g. via a command-line flag).
+  #     config.default_formatter = "doc"
+  #   end
+  #
+  #   # Print the 10 slowest examples and example groups at the
+  #   # end of the spec run, to help surface which specs are running
+  #   # particularly slow.
+  #   config.profile_examples = 10
+  #
+  #   # Run specs in random order to surface order dependencies. If you find an
+  #   # order dependency and want to debug it, you can fix the order by providing
+  #   # the seed, which is printed after each run.
+  #   #     --seed 1234
+  #   config.order = :random
+  #
+  #   # Seed global randomization in this process using the `--seed` CLI option.
+  #   # Setting this allows you to use `--seed` to deterministically reproduce
+  #   # test failures related to randomization by passing the same `--seed` value
+  #   # as the one that triggered the failure.
+  #   Kernel.srand config.seed
+end
diff --git a/spec/support/models/random_generator.rb b/spec/support/models/random_generator.rb
new file mode 100644
index 0000000..5ad8062
--- /dev/null
+++ b/spec/support/models/random_generator.rb
@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+class RandomGenerator
+  KAPA = 3.95578
+
+  class << self
+    def rand
+      @rand ||= Random.rand
+
+      @rand = KAPA * @rand * (1 - @rand)
+    end
+
+    def seed(value)
+      @rand = value.abs % 1
+      @rand = nil if @rand.zero?
+    end
+  end
+end
diff --git a/spec/tmp/.keep b/spec/tmp/.keep
new file mode 100644
index 0000000..e69de29
diff --git a/test/arrtest.rb b/test/arrtest.rb
index 208072c..00a95a3 100644
--- a/test/arrtest.rb
+++ b/test/arrtest.rb
@@ -1,12 +1,12 @@
-require '../lib/gnuplot'
+require 'gnuplot'
 
 Gnuplot.open do |gp|
   Gnuplot::Plot.new( gp ) do |plot|
-  
+
     plot.title  "Array Plot Example"
     plot.ylabel "x"
     plot.xlabel "x^2"
-    
+
     x = (0..50).collect { |v| v.to_f }
     y = x.collect { |v| v ** 2 }
 
@@ -14,8 +14,8 @@
       ds.with = "linespoints"
       ds.notitle
     end
-    
+
   end
-  
+
 end
-    
+
diff --git a/test/histtest.rb b/test/histtest.rb
index dd09e24..9207005 100644
--- a/test/histtest.rb
+++ b/test/histtest.rb
@@ -1,20 +1,20 @@
-require '../lib/gnuplot'
+require 'gnuplot'
 
 Gnuplot.open do |gp|
-    gp << "bin(x, s) = s*int(x/s)\n"
+  gp << "bin(x, s) = s*int(x/s)\n"
 
-    Gnuplot::Plot.new( gp ) do |plot|
-	plot.title  "Histogram"
-	plot.xlabel "x"
-	plot.ylabel "frequency"
+  Gnuplot::Plot.new( gp ) do |plot|
+    plot.title  "Histogram"
+    plot.xlabel "x"
+    plot.ylabel "frequency"
 
-	x = (0..500).collect { |v| (rand()-0.5)**3 }
-	plot.data << Gnuplot::DataSet.new( [x] ) do |ds|
-	    ds.title = "smooth frequency" 
-	    ds.using = "(bin($1,.01)):(1.)"
-	    ds.smooth = "freq"
-	    ds.with = "boxes"
-	end
+    x = (0..500).collect { |v| (rand()-0.5)**3 }
+    plot.data << Gnuplot::DataSet.new( [x] ) do |ds|
+      ds.title = "smooth frequency"
+      ds.using = "(bin($1,.01)):(1.)"
+      ds.smooth = "freq"
+      ds.with = "boxes"
     end
+  end
 end
 
diff --git a/test/multtest.rb b/test/multtest.rb
index 1aeb1d5..dcd06c1 100644
--- a/test/multtest.rb
+++ b/test/multtest.rb
@@ -1,31 +1,31 @@
-require '../lib/gnuplot'
+require 'gnuplot'
 
 # File.open( "gnuplot.dat", "w") do |gp|
 Gnuplot.open do |gp|
   Gnuplot::Plot.new( gp ) do |plot|
-  
+
     plot.xrange "[-10:10]"
     plot.title  "Sin Wave Example"
     plot.ylabel "x"
     plot.xlabel "sin(x)"
-    
+
     x = (0..50).collect { |v| v.to_f }
     y = x.collect { |v| v ** 2 }
 
     plot.data = [
       Gnuplot::DataSet.new( "sin(x)" ) { |ds|
-	ds.with = "lines"
-	ds.title = "String function"
-	ds.linewidth = 4
+        ds.with = "lines"
+        ds.title = "String function"
+        ds.linewidth = 4
       },
-    
+
       Gnuplot::DataSet.new( [x, y] ) { |ds|
-	ds.with = "linespoints"
-	ds.title = "Array data"
+        ds.with = "linespoints"
+        ds.title = "Array data"
       }
     ]
 
   end
-  
+
 end
-    
+
diff --git a/test/sinwave.rb b/test/sinwave.rb
index f7e7131..78db32e 100644
--- a/test/sinwave.rb
+++ b/test/sinwave.rb
@@ -1,19 +1,19 @@
-require '../lib/gnuplot'
+require 'gnuplot'
 
 Gnuplot.open do |gp|
   Gnuplot::Plot.new( gp ) do |plot|
-  
+
     plot.xrange "[-10:10]"
     plot.title  "Sin Wave Example"
     plot.ylabel "x"
     plot.xlabel "sin(x)"
-    
+
     plot.data << Gnuplot::DataSet.new( "sin(x)" ) do |ds|
       ds.with = "lines"
       ds.linewidth = 4
     end
-    
+
   end
-  
+
 end
-    
+
diff --git a/test/test_gnuplot.rb b/test/test_gnuplot.rb
index 8216130..19b7625 100644
--- a/test/test_gnuplot.rb
+++ b/test/test_gnuplot.rb
@@ -1,18 +1,26 @@
 # -*- ruby -*-
 
-require '../lib/gnuplot'
-require 'test/unit'
+require 'gnuplot'
+require 'minitest/autorun'
+
+class StdDataTest < MiniTest::Test
 
-class StdDataTest < Test::Unit::TestCase
-    
   def test_array_1d
     data = (0..5).to_a
     ds = Gnuplot::DataSet.new( data )
-    
+
     assert data == ds.data
     assert data.join("\n") + "\n", ds.to_gplot
   end
 
+  def test_empty_array
+    data = []
+    ds = Gnuplot::DataSet.new( data )
+
+    assert data == ds.data
+    assert "" == ds.to_gplot
+  end
+
 
   # Test a multidimensional array.
 
@@ -20,48 +28,50 @@ def test_array_nd
     d1 = (0..3).to_a
     d2 = d1.collect { |v| 3 * v }
     d3 = d2.collect { |v| 4 * v }
-    
+
     data = [ d1, d2, d3 ]
     ds = Gnuplot::DataSet.new( data )
-    
+
     assert data == ds.data
     assert "0 0 0\n1 3 12\n2 6 24\n3 9 36\n", ds.to_gplot
   end
 end
 
 
-class DataSetTest < Test::Unit::TestCase
+class DataSetTest < MiniTest::Test
 
   def test_yield_ctor
     ds = Gnuplot::DataSet.new do |ds|
-      ds.with = "lines" 
+      ds.with = "lines"
       ds.using = "1:2"
       ds.data = [ [0, 1, 2], [1, 2, 5] ]
     end
-    
+
     assert "lines", ds.with
     assert "1:2",   ds.using
     assert nil == ds.title
     assert [ [0, 1, 2], [1, 2, 5] ] == ds.data
     assert "'-' using 1:2 with lines",  ds.plot_args
-    assert "0 1\n1 2\n2 5\n", ds.to_gplot 
+    assert "0 1\n1 2\n2 5\n", ds.to_gplot
   end
-  
+
 end
 
 
-class PlotTest < Test::Unit::TestCase
-  
+class PlotTest < MiniTest::Test
+
   def test_no_data
     plot = Gnuplot::Plot.new do |p|
       p.set "output", "'foo'"
       p.set "terminal", "postscript enhanced"
+      p.unset "border"
     end
 
-    assert( plot.sets ==
-		 [ ["output", "'foo'"], 
-		   ["terminal", "postscript enhanced"] ] )
-    
+    assert( plot.settings ==
+		 [ [:set, "output", "'foo'"],
+		   [:set, "terminal", "postscript enhanced"],
+                   [:unset, "border"] ] )
+
 
     assert( plot.to_gplot, \
 		 "set output 'foo'\nset terminal postscript enhanced\n" )
@@ -78,11 +88,49 @@ def test_set
     assert "'foo'", plot["title"]
   end
 
+  def test_unset
+    plot = Gnuplot::Plot.new do |p|
+      p.unset "title"
+    end
+    assert_nil plot["title"]
+
+    plot.unset "title"
+    assert_nil plot["title"]
+  end
+
+  def test_style
+    plot = Gnuplot::Plot.new do |p|
+      s1 = p.style do |s|
+        s.ls = 1
+        s.lt = 1
+        s.lc = 1
+        s.pt = 1
+        s.ps = 1
+      end
+      assert s1.to_s == "set style line 1 ls 1 lt 1 lc 1 pt 1 ps 1", "correct style definition"
+      assert s1.index == 1, "set index correctly"
+
+      s2 = p.style do |s|
+        s.ls = 2
+      end
+      assert s2.to_s == "set style line 2 ls 2", "correct style definition"
+      assert s2.index == 2, "index must be incremented"
+
+      ds = Gnuplot::DataSet.new do |ds|
+        ds.with = "lines"
+        ds.linestyle = s1
+        ds.data = [ [0, 1, 2], [1, 2, 5] ]
+      end
+
+      assert ds.plot_args == "'-' with lines linestyle 1", "convert linestyle to index" # index of s1
+    end
+  end
+
 end
 
 
 require 'rbconfig'
-CONFIG = Config::MAKEFILE_CONFIG
+CONFIG = RbConfig::MAKEFILE_CONFIG
 
 # This attempts to test the functions that comprise the gnuplot package.  Most
 # of the bug reports that I get for this package have to do with finding the
@@ -94,7 +142,7 @@ class GnuplotModuleTest
 
   def test_which
     # Put the spaces around the command to make sure that it gets stripped
-    # properly. 
+    # properly.
     assert( CONFIG["SHELL"], Gnuplot::which(" sh " ) )
     assert( CONFIG["SHELL"], Gnuplot::which( CONFIG["SHELL"] ) )
   end
@@ -111,10 +159,10 @@ def test_gnuplot
     # name (one that is in the path) then I should get the shell name as the
     # result of the gnuplot call.
 
-    ENV["RB_GNUPLOT"] = "sh" 
+    ENV["RB_GNUPLOT"] = "sh"
     assert( CONFIG["SHELL"], Gnuplot.gnuplot(false) )
   end
-      
+
 end