Fixed memory leak with Object#remove_subclasses_of, which inflicted a Rails application running in development mode with a ~20KB leak per request #1289 [c.r.mcgrath@gmail.com]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@1569 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

1 files changed, 18 insertions, 0 deletions

diff --git a/activesupport/test/core_ext/object_and_class_ext_test.rb b/activesupport/test/core_ext/object_and_class_ext_test.rb
index a0a6243480..cf75159575 100644
--- a/activesupport/test/core_ext/object_and_class_ext_test.rb
+++ b/activesupport/test/core_ext/object_and_class_ext_test.rb
@@ -5,6 +5,13 @@ class ClassA; end
 class ClassB < ClassA; end
 class ClassC < ClassB; end
 class ClassD < ClassA; end
+class RemoveSubsTestClass; end
+class RemoveSubsBaseClass
+  def self.add_ivar
+    @ivar = RemoveSubsTestClass.new
+  end
+end
+class RemoveSubsSubClass < RemoveSubsBaseClass; end
 
 class ClassExtTest < Test::Unit::TestCase
   def test_methods
@@ -30,4 +37,15 @@ class ObjectTests < Test::Unit::TestCase
     suppress(LoadError, ArgumentError) { raise LoadError }
     suppress(LoadError, ArgumentError) { raise ArgumentError }
   end
+  
+  def test_remove_subclasses_of_unsets_ivars
+    r = RemoveSubsSubClass.new
+    RemoveSubsSubClass.add_ivar
+    RemoveSubsBaseClass.remove_subclasses
+
+    GC.start
+    ObjectSpace.each_object do |o|
+      flunk("ObjectSpace still contains RemoveSubsTestClass") if o.class == RemoveSubsTestClass
+    end
+  end
 end
\ No newline at end of file