public void testSampleCovariance() {
    assertThrows(IllegalStateException.class, () -> emptyAccumulator.sampleCovariance());
    assertThrows(
        IllegalStateException.class,
        () -> emptyAccumulatorByAddAllEmptyPairedStats.sampleCovariance());
    assertThrows(IllegalStateException.class, () -> oneValueAccumulator.sampleCovariance());
    assertThrows(
        IllegalStateException.class,

    StopFailingService service = new StopFailingService();
    assertThrows(IllegalStateException.class, () -> service.failureCause());
    service.startAsync().awaitRunning();
    assertThrows(IllegalStateException.class, () -> service.failureCause());
    IllegalStateException e =
        assertThrows(IllegalStateException.class, () -> service.stopAsync().awaitTerminated());
    assertEquals(EXCEPTION, service.failureCause());

    StopFailingService service = new StopFailingService();
    assertThrows(IllegalStateException.class, () -> service.failureCause());
    service.startAsync().awaitRunning();
    assertThrows(IllegalStateException.class, () -> service.failureCause());
    IllegalStateException e =
        assertThrows(IllegalStateException.class, () -> service.stopAsync().awaitTerminated());
    assertEquals(EXCEPTION, service.failureCause());

        throw new IllegalStateException();
    }

    @Override
    public File getFile() {
        return file;
    }

    @Override
    public void builtBy(Object... tasks) {
        throw new IllegalStateException();
    }

    @Nonnull
    @Override
    public TaskDependency getBuildDependencies() {
        throw new IllegalStateException();
    }

    @Override

        when:
        executed.started {
            executor.execute { action.run() }
        }

        then:
        1 * action.run() >> { executed.done() }
    }

    @FailsWithMessage(type = IllegalStateException, message = 'Expected async action to complete, but it did not.')
    def "async action fails when expected mock method is never called"() {
        Runnable action = Mock()
        def executed = startsAsyncAction()

  public void testSampleVariance() {
    assertThrows(IllegalStateException.class, () -> emptyAccumulator.sampleVariance());
    assertThrows(
        IllegalStateException.class, () -> emptyAccumulatorByAddAllEmptyIterable.sampleVariance());
    assertThrows(
        IllegalStateException.class, () -> emptyAccumulatorByAddAllEmptyStats.sampleVariance());
    assertThrows(IllegalStateException.class, () -> oneValueAccumulator.sampleVariance());

        then:
        def e = thrown(IllegalStateException)
        assertCannotConfigureErrorIsThrown(e, "removeUnusedEntriesOlderThan")

        when:
        cacheConfigurations.downloadedResources.setRemoveUnusedEntriesAfterDays(1)

        then:
        e = thrown(IllegalStateException)
        assertCannotConfigureErrorIsThrown(e, "removeUnusedEntriesOlderThan")

        when:

    def "cannot get failure when has no result"() {
        when:
        descriptor.failure

        then:
        thrown(IllegalStateException)
    }

    def "cannot get meta-data when has no result"() {
        when:
        descriptor.metaData

        then:
        thrown(IllegalStateException)
    }

    def "cannot get authoritative flag when has no result"() {
        when:

        withLock {
            if (startThread == null) {
                def e = new IllegalStateException("Action has not been started.")
                e.printStackTrace()
                throw e
            }
            if (Thread.currentThread() == startThread) {
                def e = new IllegalStateException("Cannot wait for action to complete from the thread that is executing it.")
                e.printStackTrace()

     * @return the settings for this build
     * @throws IllegalStateException when the build is not loaded yet, see {@link #attachSettings(SettingsState)}
     */
    SettingsInternal getSettings() throws IllegalStateException;

    /**
     * Called by the BuildLoader after the settings are loaded.
     * Until the BuildLoader is executed, {@link #getSettings()} will throw {@link IllegalStateException}.
     *