merge revision(s) 39811: [Backport #8146]

	* gc.c: Avoid unnecessary heap growth. patched by tmm1(Aman Gupta).
	  [Bug #8093] [ruby-core:53393]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@40176 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 14 insertions, 0 deletions

diff --git a/test/ruby/test_gc.rb b/test/ruby/test_gc.rb
index 62ae7ae5be..e3186c9a44 100644
--- a/test/ruby/test_gc.rb
+++ b/test/ruby/test_gc.rb
@@ -146,4 +146,18 @@ class TestGc < Test::Unit::TestCase
       ObjectSpace.define_finalizer(Thread.main) { p 'finalize' }
     EOS
   end
+
+  def test_expand_heap
+    assert_separately %w[--disable-gem], __FILE__, __LINE__, <<-'eom'
+    base_length = GC.stat[:heap_length]
+    (base_length * 500).times{ 'a' }
+    GC.start
+    assert_equal base_length, GC.stat[:heap_length], "invalid heap expanding"
+
+    a = []
+    (base_length * 500).times{ a << 'a' }
+    GC.start
+    assert base_length < GC.stat[:heap_length]
+    eom
+  end
 end