covers 'facets/hash/stringify_keys' test_case Hash do method :stringify_keys do test do foo = { :a=>1, :b=>2 } foo.stringify_keys.assert == { "a"=>1, "b"=>2 } foo.assert == { :a =>1, :b=>2 } end end method :stringify_keys! do test do foo = { :a=>1, :b=>2 } foo.stringify_keys!.assert == { "a"=>1, "b"=>2 } foo.assert == { "a"=>1, "b"=>2 } end end end