等待单元测试中的Platform.RunLater

问题描述

我有一个表示形式类，该类存储一个XYChart.Series对象，并通过观察模型对其进行更新.通过使用Platform.runLater(...)

I have a presentation class storing an XYChart.Series object and updating it by observing the model. The Series updating is done by using Platform.runLater(...)

我要对此单元进行测试，确保runLater中的命令正确执行.如何告诉单元测试等待runLater命令完成?现在我要做的就是在测试线程上使用Thread.Sleep(...)，给FXApplicationThread时间来完成，但这听起来很愚蠢.

I want to unit-test this, making sure the commands in runLater are performed correctly. How do I tell the unit-test to wait for the runLater commands to be done?Right now all I do is Thread.Sleep(...) on the test-thread to give the FXApplicationThread the time to complete, but that sounds stupid.

推荐答案

我解决的方法如下.

1)创建一个简单的信号量函数，如下所示:

1) Create a simple semaphore function like this:

public static void waitForRunLater() throws InterruptedException {
    Semaphore semaphore = new Semaphore(0);
    Platform.runLater(() -> semaphore.release());
    semaphore.acquire();

}

2)每当需要等待时，都呼叫waitForRunLater().因为Platform.runLater()(根据javadoc)按照提交的顺序执行可运行对象，所以您可以在测试中编写:

2) Call waitForRunLater() whenever you need to wait. Because Platform.runLater() (according to the javadoc) execute runnables in the order they were submitted, you can just write within a test:

...
commandThatSpawnRunnablesInJavaFxThread(...)
waitForRunLater(...)
asserts(...)`

适用于简单测试

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