test/structure_test.rb in structure-0.20.0 vs test/structure_test.rb in structure-0.20.1

@@ -35,9 +35,10 @@
     assert_respond_to Person.new, :name=
   end
 
   def test_key_errors
     assert_raise(NameError) { Person.key :class }
+    assert_raise(TypeError) { Person.key :foo, String, 1 }
   end
 
   def test_key_defaults
     assert_equal [], Person.new.friends
   end