1 files changed, 10 insertions, 0 deletions
diff --git a/test/ruby/test_env.rb b/test/ruby/test_env.rb
index 41d1ccf306..ecf0608ec6 100644
--- a/test/ruby/test_env.rb
+++ b/test/ruby/test_env.rb
@@ -1,4 +1,5 @@
 require 'test/unit'
+require_relative 'envutil'
 
 class TestEnv < Test::Unit::TestCase
   IGNORE_CASE = /bccwin|mswin|mingw/ =~ RUBY_PLATFORM
@@ -507,4 +508,13 @@ class TestEnv < Test::Unit::TestCase
       end.call
     end
   end
+
+  def test_memory_leak_aset
+    bug9977 = '[ruby-dev:48323] [Bug #9977]'
+    assert_no_memory_leak([], <<-'end;', "5_000.times {ENV[k] = v}", bug9977)
+      ENV.clear
+      k = 'FOO'
+      v = (ENV[k] = 'bar'*5000 rescue 'bar'*1500)
+    end;
+  end
 end