} else if (event instanceof TransformProgressEvent) {
            transformProgressListeners.getSource().statusChanged(event);
        } else if (event instanceof TestOutputEvent) {
            testOutputProgressListeners.getSource().statusChanged(event);
        } else if (event instanceof BuildPhaseProgressEvent) {
            buildPhaseListeners.getSource().statusChanged(event);

    }

    class ValidatingProgressEventListener implements ProgressListener {

        ProgressEvent suiteEvent = null
        ProgressEvent testEvent = null

        @Override
        void statusChanged(ProgressEvent event) {
            if (event.descriptor.displayName == "Test suite 'MyCustomTestRoot'") {
                suiteEvent = event
            } else if (event.descriptor.displayName == 'org.my.MyClass descriptor') {

        problems.size() == 0
    }

    class ProblemProgressListener implements ProgressListener {

        List<?> problems = []
        @Override
        void statusChanged(ProgressEvent event) {
            if (event instanceof ProblemEvent) {
                 this.problems.add(event)
            }
        }
    }

        problems[0].failure == null
    }

    class ProblemProgressListener implements ProgressListener {

        List<?> problems = []

        @Override
        void statusChanged(ProgressEvent event) {
            if (event instanceof ProblemEvent) {
                this.problems.add(event)
            }
        }
    }

        problems[0].failure.failure == null
    }

    class ProblemProgressListener implements ProgressListener {

        List<SingleProblemEvent> problems = []

        @Override
        void statusChanged(ProgressEvent event) {
            if (event instanceof SingleProblemEvent) {
                this.problems.add(event)
            }
        }
    }

                .build()
                .forTasks(["hello"])
                .addProgressListener(new ProgressListener() {
                    @Override
                    void statusChanged(ProgressEvent event) {
                        events += event.getDescriptor().getDisplayName() + "\n"
                    }
                }, OperationType.TASK)
                .run()
        }

    }

    class TestOperationCollector implements ProgressListener {

        List<TestOperationDescriptor> descriptors = []

        @Override
        void statusChanged(ProgressEvent event) {
            if (event instanceof TestFinishEvent) {
                descriptors += ((TestFinishEvent) event).descriptor
            }
        }
    }