1 files changed, 21 insertions, 0 deletions
diff --git a/test/psych/test_merge_keys.rb b/test/psych/test_merge_keys.rb
new file mode 100644
index 0000000000..9aadcc85e5
--- /dev/null
+++ b/test/psych/test_merge_keys.rb
@@ -0,0 +1,21 @@
+require_relative 'helper'
+
+module Psych
+  class TestMergeKeys < TestCase
+    # [ruby-core:34679]
+    def test_merge_key
+      yaml = <<-eoyml
+foo: &foo
+  hello: world
+bar:
+  << : *foo
+  baz: boo
+      eoyml
+
+      hash = {
+        "foo" => { "hello" => "world"},
+        "bar" => { "hello" => "world", "baz" => "boo" } }
+      assert_equal hash, Psych.load(yaml)
+    end
+  end
+end