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-rw-r--r--test/psych/test_hash.rb14
1 files changed, 14 insertions, 0 deletions
diff --git a/test/psych/test_hash.rb b/test/psych/test_hash.rb
index 2a563da1da7..ba11b827da2 100644
--- a/test/psych/test_hash.rb
+++ b/test/psych/test_hash.rb
@@ -111,5 +111,19 @@ bar:
eoyml
assert_equal({"foo"=>{"hello"=>"world"}, "bar"=>{"hello"=>"world"}}, hash)
end
+
+ def test_key_deduplication
+ unless String.method_defined?(:-@) && (-("a" * 20)).equal?((-("a" * 20)))
+ skip "This Ruby implementation doesn't support string deduplication"
+ end
+
+ hashes = Psych.load(<<-eoyml)
+---
+- unique_identifier: 1
+- unique_identifier: 2
+eoyml
+
+ assert_same hashes[0].keys.first, hashes[1].keys.first
+ end
end
end