# File test/unit/assertions.rb, line 60
      def assert_raises(expected_exception_klass, message="")
        _wrap_assertion do
          assert_instance_of(Class, expected_exception_klass, "Should expect a class of exception")
          actual_exception = nil
          full_message = build_message(message, expected_exception_klass) do |arg|
            "<#{arg}> exception expected but none was thrown"
          end
          assert_block(full_message) do
            thrown = false
            begin
              yield
            rescue Exception => thrown_exception
              actual_exception = thrown_exception
              thrown = true
            end
            thrown
          end
          full_message = build_message(message, expected_exception_klass, actual_exception) do |arg1, arg2|
            "<#{arg1}> exception expected but was\n" +
            arg2
          end
          assert_block(full_message) { expected_exception_klass == actual_exception.class }
          actual_exception
        end
      end