Eliminate dependency on Rails::VERSION::STRING

To facilitate the use of ActiveSupport::Testing::Performance outside
of a Rails application conditionally check for the presence of
Rails::VERSION::STRING before including it in the environment string.

1 files changed, 21 insertions, 2 deletions

diff --git a/activesupport/test/testing/performance_test.rb b/activesupport/test/testing/performance_test.rb
index 74d7dae9e7..53073cb8db 100644
--- a/activesupport/test/testing/performance_test.rb
+++ b/activesupport/test/testing/performance_test.rb
@@ -11,7 +11,7 @@ module ActiveSupport
         assert_equal "1", amount_metric.format(1.23)
         assert_equal "40,000,000", amount_metric.format(40000000)
       end
-      
+
       def test_time_format
         time_metric = ActiveSupport::Testing::Performance::Metrics[:time].new
         assert_equal "0 ms", time_metric.format(0)
@@ -21,7 +21,7 @@ module ActiveSupport
         assert_equal "40000.00 sec", time_metric.format(40000)
         assert_equal "-5000 ms", time_metric.format(-5)
       end
-      
+
       def test_space_format
         space_metric = ActiveSupport::Testing::Performance::Metrics[:digital_information_unit].new
         assert_equal "0 Bytes", space_metric.format(0)
@@ -35,6 +35,25 @@ module ActiveSupport
         assert_equal "91 TB", space_metric.format(10**14)
         assert_equal "910000 TB", space_metric.format(10**18)
       end
+
+      def test_environment_format_without_rails
+        metric = ActiveSupport::Testing::Performance::Metrics[:time].new
+        benchmarker = ActiveSupport::Testing::Performance::Benchmarker.new(self, metric)
+        assert_equal "#{RUBY_ENGINE}-#{RUBY_VERSION}.#{RUBY_PATCHLEVEL},#{RUBY_PLATFORM}", benchmarker.environment
+      end
+
+      def test_environment_format_with_rails
+        rails, version = Module.new, Module.new
+        version.const_set :STRING, "4.0.0"
+        rails.const_set :VERSION, version
+        Object.const_set :Rails, rails
+
+        metric = ActiveSupport::Testing::Performance::Metrics[:time].new
+        benchmarker = ActiveSupport::Testing::Performance::Benchmarker.new(self, metric)
+        assert_equal "rails-4.0.0,#{RUBY_ENGINE}-#{RUBY_VERSION}.#{RUBY_PATCHLEVEL},#{RUBY_PLATFORM}", benchmarker.environment
+      ensure
+        Object.send :remove_const, :Rails
+      end
     end
   end
 end
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