merges r27737 from trunk into ruby_1_9_2.

--
* test/rake/test_task_arguments.rb: makes ENV empty during tests
  because ENV may change the behavior of Rake::TaskArguments.
  [ruby-core:29984]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@27832 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 7 insertions, 2 deletions

diff --git a/test/rake/test_task_arguments.rb b/test/rake/test_task_arguments.rb
index deb5f19ea2..d40144f3fd 100644
--- a/test/rake/test_task_arguments.rb
+++ b/test/rake/test_task_arguments.rb
@@ -3,9 +3,14 @@ require 'rake'
 
 ######################################################################
 class Rake::TestTaskArguments < Test::Unit::TestCase
+  def setup
+    @backup = ENV.to_hash
+    ENV.clear
+  end
+
   def teardown
-    ENV.delete('rev')
-    ENV.delete('VER')
+    ENV.clear
+    @backup.each {|k, v| ENV[k] = v }
   end
 
   def test_empty_arg_list_is_empty