provider/archive: Test that archive_file hashes seem plausible

We just check these for syntax rather than exact value because the
underlying archive library is free to evolve its exact encoding over time
as long as the result is semantically equivalent, and we don't want these
tests to break when we build on different versions of Go.

Author: apparentlymart

builtin/providers/archive/data_source_archive_file_test.go

@@ -3,6 +3,7 @@ package archive
 import (
 	"fmt"
 	"os"
+	"regexp"
 	"testing"
 
 	r "github.com/hashicorp/terraform/helper/resource"
@@ -19,6 +20,21 @@ func TestAccArchiveFile_Basic(t *testing.T) {
 				Check: r.ComposeTestCheckFunc(
 					testAccArchiveFileExists("zip_file_acc_test.zip", &fileSize),
 					r.TestCheckResourceAttrPtr("data.archive_file.foo", "output_size", &fileSize),
+
+					// We just check the hashes for syntax rather than exact
+					// content since we don't want to break if the archive
+					// library starts generating different bytes that are
+					// functionally equivalent.
+					r.TestMatchResourceAttr(
+						"data.archive_file.foo", "output_base64sha256",
+						regexp.MustCompile(`^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)?$`),
+					),
+					r.TestMatchResourceAttr(
+						"data.archive_file.foo", "output_md5", regexp.MustCompile(`^[0-9a-f]{32}$`),
+					),
+					r.TestMatchResourceAttr(
+						"data.archive_file.foo", "output_sha", regexp.MustCompile(`^[0-9a-f]{40}$`),
+					),
 				),
 			},
 			r.TestStep{