如何使用JUnit对JavaFX控制器进行单元测试
初始化JavaFX运行时的正确方法是什么,这样您就可以(使用JUnit)单元测试使用并发工具和如何使用JUnit对JavaFX控制器进行单元测试,java,unit-testing,junit,javafx-2,Java,Unit Testing,Junit,Javafx 2,初始化JavaFX运行时的正确方法是什么,这样您就可以(使用JUnit)单元测试使用并发工具和Platform.runLater(Runnable) 从@BeforeClass方法调用Application.launch(…)会导致死锁。如果未调用Application.launch(…),则引发以下错误: java.lang.IllegalStateException: Toolkit not initialized at com.sun.javafx.application.Pla
Platform.runLater(Runnable)
从@BeforeClass
方法调用Application.launch(…)
会导致死锁。如果未调用Application.launch(…)
,则引发以下错误:
java.lang.IllegalStateException: Toolkit not initialized
at com.sun.javafx.application.PlatformImpl.runLater(PlatformImpl.java:121)
at com.sun.javafx.application.PlatformImpl.runLater(PlatformImpl.java:116)
at javafx.application.Platform.runLater(Platform.java:52)
at javafx.concurrent.Task.runLater(Task.java:1042)
at javafx.concurrent.Task.updateMessage(Task.java:987)
at com.xyz.AudioSegmentExtractor.call(AudioSegmentExtractor.java:64)
at com.xyz.CompletionControllerTest.setUp(CompletionControllerTest.java:69)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:27)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
后续:这是我根据@SergeyGrinev推荐使用的主题
... // Inside test class
public static class AsNonApp extends Application {
@Override
public void start(Stage primaryStage) throws Exception {
// noop
}
}
@BeforeClass
public static void initJFX() {
Thread t = new Thread("JavaFX Init Thread") {
public void run() {
Application.launch(AsNonApp.class, new String[0]);
}
};
t.setDaemon(true);
t.start();
}
... // controller tests follow...
从@BeforeClass
调用launch()
是一种正确的方法。请注意,launch()
不会将控制权返回到调用代码。因此,您必须将其包装到新线程(…).start()
7年后的更新:
使用!它将以适当的方式进行发射。例如,您可以从TestFX的ApplicationTest类扩展测试,只需使用相同的代码:
public class MyTest extends ApplicationTest {
@Override
public void start (Stage stage) throws Exception {
FXMLLoader loader = new FXMLLoader(
getClass().getResource("mypage.fxml"));
stage.setScene(scene = new Scene(loader.load(), 300, 300));
stage.show();
}
然后编写这样的测试:
@Test
public void testBlueHasOnlyOneEntry() {
clickOn("#tfSearch").write("blue");
verifyThat("#labelCount", hasText("1"));
}
我发现这是可行的,。。。但是只有在启动JavaFX应用程序线程后添加Thread.sleep(500)之后。大概需要一些时间来准备好FX环境(在我的MacBookPro视网膜上大约200毫秒)
对于使用JavaFX并发结构(如
JavaFX.concurrent.Task
)的代码,这对我来说同样适用。与其他解决方案相比,它不需要显式的线程管理或提供虚拟的应用程序
@BeforeAll
public static void setUpJavaFXRuntime() throws InterruptedException {
CountDownLatch latch = new CountDownLatch(1);
Platform.startup(() -> {
latch.countDown();
});
latch.await(5, TimeUnit.SECONDS);
}
@AfterAll
public static void tearDownJavaFXRuntime() throws InterruptedException {
Platform.exit();
}
[Application.launch](不能多次调用它,否则将引发异常。)文档说明:“不能多次调用它,否则将引发异常。”,如果您尝试多次运行此答案中的setUpClass()方法,请注意。
@BeforeAll
public static void setUpJavaFXRuntime() throws InterruptedException {
CountDownLatch latch = new CountDownLatch(1);
Platform.startup(() -> {
latch.countDown();
});
latch.await(5, TimeUnit.SECONDS);
}
@AfterAll
public static void tearDownJavaFXRuntime() throws InterruptedException {
Platform.exit();
}