assert_instance_of

# File lib/test/unit/assertions.rb, line 153
      def assert_instance_of(klass, object, message="")
        _wrap_assertion do
          assert_equal(Class, klass.class, "assert_instance_of takes a Class as its first argument")
          full_message = build_message(message, "<?> expected to be an instance of\n<?> but was\n<?>.\n", object, klass, object.class)
          assert_block(full_message){object.instance_of?(klass)}
        end
      end