runBuild(tasks)
        waitForBuild()
        return extractFailure()
    }

    ExecutionFailure buildTriggeredAndFailed() {
        if (!gradle.isRunning()) {
            throw new UnexpectedBuildFailure("Gradle has exited")
        }
        waitForBuild()
        return extractFailure()
    }

    private ExecutionFailure extractFailure() {
        if (!(result instanceof ExecutionFailure)) {