}

    def formatsTextAndEndOfLine() {
        when:
        output.formatln('[%s]', 'message')

        then:
        output.value == '[message]\n'
    }

    def formatsException() {
        when:
        output.exception(new RuntimeException('broken'))

        then:
        output.value == 'java.lang.RuntimeException: broken\n{stacktrace}\n'
    }