运行两个测试用例时，“应用程序启动不能被多次调用”JavaFX错误
运行两个测试用例时，“应用程序启动不能被多次调用”JavaFX错误
提问于 2022-10-27 10:44:25
我正在使用JavaFX编写一个示例视频播放器。但是，当一起运行时，测试会失败(注意:单独测试通过)。
错误：Unexpected exception thrown: java.lang.IllegalStateException: Application launch must not be called more than once
据我所知，在同一个应用程序实例上调用两次launch()会导致这个问题。但是我无法理解，在一个测试完成之后，为什么这个应用程序还在运行呢？为什么没有为第二次测试创建新实例。testUnsupportedVideoFileThrowsError()成功了，但testSupportedVideoFilePlaysSuccessfully()失败了。
package media;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.media.Media;
import javafx.scene.media.MediaPlayer;
import javafx.scene.media.MediaView;
import javafx.stage.Stage;
import java.io.File;
public class PlayVideoSnippet extends Application {
private static String source;
private Media media = null;
private MediaPlayer mediaPlayer = null;
private MediaView mediaView = null;
private Scene scene = null;
public static void playVideo(String source) {
PlayVideoSnippet.source = source;
PlayVideoSnippet.launch();
}
@Override
public void start(Stage stage) throws InterruptedException {
try {
media = new Media(new File(source).toURI().toString());
//onError close the app
media.setOnError(() -> {
Platform.exit();
});
//Create MediaPlayer, with media
mediaPlayer = new MediaPlayer(media);
mediaPlayer.setAutoPlay(true);
//onEnd of media, close the app
mediaPlayer.setOnEndOfMedia(() -> {
Platform.exit();
});
//Create media viewer
mediaView = new MediaView(mediaPlayer);
//create scene
scene = new Scene(new Group(), media.getWidth(), media.getHeight());
stage.setScene(scene);
stage.setTitle("Video Player");
//attach the mediaView to the scene root
((Group) scene.getRoot()).getChildren().add(mediaView);
stage.show();
} finally {
System.out.println("Inside finally");
stage.close();
}
}
}package media;
import javafx.scene.media.MediaException;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;
class PlayVideoSnippetTest {
/**
* Tests for {@link PlayVideoSnippet#playVideo(String)}.
*/
final String PATH_OF_SUPPORTED_VIDEO_FILE = "src/test/resources/file_example_MP4_480_1_5MG.mp4";
final String PATH_OF_UNSUPPORTED_VIDEO_FILE = "src/test/resources/file_example_WMV_480_1_2MB.wmv";
@Test
void testSupportedVideoFilePlaysSuccessfully() {
assertDoesNotThrow(() -> PlayVideoSnippet.playVideo(PATH_OF_SUPPORTED_VIDEO_FILE));
}
@Test
void testUnsupportedVideoFileThrowsError() {
RuntimeException exception = assertThrows(RuntimeException.class, () -> PlayVideoSnippet.playVideo(PATH_OF_UNSUPPORTED_VIDEO_FILE));
assertTrue(exception.getCause().getClass().equals(MediaException.class));
}
}回答 1
Stack Overflow用户
发布于 2022-10-30 06:04:11
我能够通过以下输入来解决这个问题：
@jewelsea.
- Inputs从@James_D
提出的用于测试目的的
ApplicationTest.launch()方法内部负责设置初级阶段，并在每次测试之前进行清理。
解决方案：
import org.junit.jupiter.api.Test;
import org.testfx.framework.junit5.ApplicationTest;
class VideoTest extends ApplicationTest {
final String pathOfSupportedFile = "video.mp4";
final String pathOfUnsupportedFile = "video.wmv";
@Test
void testSupportedVideoFilePlaysSuccessfully() throws Exception {
assertDoesNotThrow(() -> PlayVideoSnippetTest.launch(PlayVideoSnippet.class,
new String[]{pathOfSupportedFile}));
}
@Test
void testUnsupportedVideoFileThrowsError() throws Exception {
RuntimeException exception = assertThrows(RuntimeException.class,
() -> PlayVideoSnippetTest.launch(PlayVideoSnippet.class,
new String[]{pathOfUnsupportedFile}));
assertTrue(exception.getCause().getCause().getClass().equals(MediaException.class));
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/74220813
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