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/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 4ec5086..3757e4e 100644
--- a/README.textile
+++ b/README.textile
@@ -16,10 +16,10 @@ h2.  History and Background
     
 h2.  Pre-requisites and Installation
 
-      1. Install XQuartz from here: 
+      1. (mac) Install XQuartz from here: 
 	     @http://xquartz.macosforge.org/landing/@
 	  
-	  2. Install gnuplot with homebrew:
+	  2. Install gnuplot with homebrew (not OS X? install it using your package manager):
 	     @brew install gnuplot --with-x11@
 	  
 	  3. Install gnuplot gem:
@@ -188,6 +188,8 @@ File.open( "gnuplot.dat", "w") do |gp|
 end
 </pre>    
 
+h3. Miscellanrous
+
 You can also add arbitrary lines to the output 
 
 <pre>
@@ -196,3 +198,9 @@ plot.arbitrary_lines << "set ylabel \"y label\" font \"Helvetica,20\""
 
 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/ ) 
+
+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 d8ae9ee..bc3514b 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,21 +1,23 @@
-require 'jeweler2'
-Jeweler::Tasks.new do |s|
-  s.name = 'gnuplot'
-  s.description = s.summary = "Utility library to aid in interacting with gnuplot from ruby"
-  s.version = "2.6.1"
-  s.authors='roger pack'
-  s.email = "rogerpack2005@gmail.com"
-  s.homepage = "http://github.com/rdp/ruby_gnuplot/tree/master"
-end
+require "bundler/gem_tasks"
+require 'rake'
+require 'rake/clean'
+require 'rake/testtask'
+require 'rubygems/package_task'
 
-task :default => :test
+require_relative 'lib/ruby_gnuplot/version'
 
 desc 'run unit tests'
-task :test do
-  Dir.chdir 'test'
-  for file in Dir['*']
-    system("ruby #{file}")
-  end
+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
 
-Jeweler::RubygemsDotOrgTasks.new
\ No newline at end of file
+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/lib/gnuplot.rb b/lib/gnuplot.rb
index 592b3e6..21ca23d 100644
--- a/lib/gnuplot.rb
+++ b/lib/gnuplot.rb
@@ -140,7 +140,7 @@ def unset ( var )
     # gnuplot process.
 
     def [] ( var )
-      v = @settings.rassoc( var )
+      v = @settings.reverse.rassoc( var )
       if v.nil? or v.first == :unset
           nil
       else
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
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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 18d8e34..19b7625 100644
--- a/test/test_gnuplot.rb
+++ b/test/test_gnuplot.rb
@@ -1,9 +1,9 @@
 # -*- ruby -*-
 
-require '../lib/gnuplot'
-require 'test/unit'
+require 'gnuplot'
+require 'minitest/autorun'
 
-class StdDataTest < Test::Unit::TestCase
+class StdDataTest < MiniTest::Test
 
   def test_array_1d
     data = (0..5).to_a
@@ -38,7 +38,7 @@ def test_array_nd
 end
 
 
-class DataSetTest < Test::Unit::TestCase
+class DataSetTest < MiniTest::Test
 
   def test_yield_ctor
     ds = Gnuplot::DataSet.new do |ds|
@@ -58,7 +58,7 @@ def test_yield_ctor
 end
 
 
-class PlotTest < Test::Unit::TestCase
+class PlotTest < MiniTest::Test
 
   def test_no_data
     plot = Gnuplot::Plot.new do |p|
@@ -130,7 +130,7 @@ def test_style
 
 
 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