1 files changed, 11 insertions, 0 deletions
diff --git a/test/ruby/test_time.rb b/test/ruby/test_time.rb
index d3a8645024..a0d65b6495 100644
--- a/test/ruby/test_time.rb
+++ b/test/ruby/test_time.rb
@@ -1090,6 +1090,17 @@ class TestTime < Test::Unit::TestCase
     assert_equal("366", t.strftime("%j"))
   end
 
+  def test_strftime_no_hidden_garbage
+    fmt = %w(Y m d).map { |x| "%#{x}" }.join('-') # defeats optimization
+    t = Time.at(0)
+    ObjectSpace.count_objects(res = {}) # creates strings on first call
+    before = ObjectSpace.count_objects(res)[:T_STRING]
+    val = t.strftime(fmt)
+    after = ObjectSpace.count_objects(res)[:T_STRING]
+    assert_equal before + 1, after, 'only new string is the created one'
+    assert_equal '1970-01-01', val
+  end
+
   def test_num_exact_error
     bad = EnvUtil.labeled_class("BadValue").new
     x = EnvUtil.labeled_class("Inexact") do