when:
        loggingManager.removeStandardOutputListener(stdoutListener)

        then:
        1 * loggingRouter.removeStandardOutputListener(stdoutListener)

        when:
        loggingManager.stop()

        then:
        0 * loggingRouter.removeStandardOutputListener(stdoutListener)
    }

        addStandardErrorListener(new StreamBackedStandardOutputListener(outputStream));
    }

    @Override
    public void removeStandardOutputListener(StandardOutputListener listener) {
        if (stdoutListeners.remove(listener) && started) {
            loggingOutput.removeStandardOutputListener(listener);
        }
    }

    @Override
    public void removeStandardErrorListener(StandardOutputListener listener) {

    void addStandardOutputListener(StandardOutputListener listener);

    /**
     * Removes a listener from standard output.
     *
     * @param listener The listener to remove.
     */
    void removeStandardOutputListener(StandardOutputListener listener);

    /**
     * Adds a listener which receives output written to standard error by the Gradle logging system.
     *
     * @param listener The listener to add.
     */

        def listener = new TestListener()

        when:
        renderer.enableUserStandardOutputListeners()
        renderer.addStandardOutputListener(listener)
        renderer.removeStandardOutputListener(listener)
        renderer.onOutput(event('info', LogLevel.INFO))
        renderer.onOutput(event('error', LogLevel.ERROR))

        then:
        listener.value == ''
    }

    public void addStandardErrorListener(OutputStream outputStream) {
        addStandardErrorListener(new StreamBackedStandardOutputListener(outputStream));
    }

    @Override
    public void removeStandardOutputListener(StandardOutputListener listener) {
        synchronized (lock) {
            assertUserListenersEnabled();
            userStdoutListeners.remove(listener);
        }
    }

    @Override