public static final long TIMESTAMP = 0L
    public static final String CATEGORY = 'category'
    public static final String MESSAGE = 'message'
    private final StyledTextOutput output = Mock()

    def renderWritesMessageToTextOutput() {
        given:
        def logEvent = new LogEvent(TIMESTAMP, CATEGORY, LogLevel.INFO, MESSAGE, null)

        when:
        logEvent.render(output)

        then:
        1 * output.text(MESSAGE)