Double quote stings that contain single quotes only

Fixes #324

1 files changed, 7 insertions, 0 deletions

diff --git a/test/psych/test_string.rb b/test/psych/test_string.rb
index 973f38b..e80d191 100644
--- a/test/psych/test_string.rb
+++ b/test/psych/test_string.rb
@@ -37,6 +37,13 @@ module Psych
       assert_equal str, Psych.load(yaml)
     end
 
+    def test_doublequotes_when_there_are_single_quotes_only
+      str = "psych: Please don't escape ' with ' here."
+      yaml = Psych.dump str
+      assert_equal "--- \"psych: Please don't escape ' with ' here.\"\n", yaml
+      assert_equal str, Psych.load(yaml)
+    end
+
     def test_plain_when_shorten_than_line_width_and_no_final_line_break
       str = "Lorem ipsum"
       yaml = Psych.dump str, line_width: 12