}

    def "can query failed result with multiple exceptions"() {
        def failure1 = new RuntimeException()
        def failure2 = new RuntimeException()
        def result = ExecutionResult.maybeFailed([failure1, failure2])

        expect:
        result.failures == [failure1, failure2]
        result.failure instanceof MultipleBuildFailures
        result.failure.causes == [failure1, failure2]

    }

    public static ExecutionResult<Void> maybeFailed(List<? extends Throwable> failures) {
        if (failures.isEmpty()) {
            return SUCCESS;
        } else {
            return new Failure<>(ImmutableList.copyOf(failures));
        }
    }

    public static ExecutionResult<Void> maybeFailed(@Nullable Throwable failure) {
        if (failure == null) {

        def failures = other == null ? [failure] : [failure, other]
        1 * workExecutor.execute(gradleMock, finalizedPlan) >> ExecutionResult.maybeFailed(failures)
    }

    private void expectBuildFinished(String action = "Build") {
        1 * buildListener.buildFinished({ it.failure == null && it.action == action })

        List<Throwable> failures = new ArrayList<>();
        awaitCompletion(workSource, currentWorkerLease, failures);
        return ExecutionResult.maybeFailed(failures);
    }

    @Override
    public void assertHealthy() {
        // Wait until execution state is healthy.