# File test/unit/assertions.rb, line 90
   def assert_instance_of(klass, object, message="")
				_wrap_assertion {
					assert_equal(Class, klass.type, "assert_instance_of takes a Class as its first argument")
					full_message = build_message(message, object, klass, object.type) {
						| arg1, arg2, arg3 |
						"<#{arg1}> should have been an instance of <#{arg2}> but was <#{arg3}>"
					}
					assert_block(full_message) {
						klass == object.type
					}
				}
			end