Trying to use TestFX for RegionChooser.

pom.xml

@@ -45,6 +45,31 @@
 			<artifactId>vtd-xml</artifactId>
 			<version>2.13.4</version>
 		</dependency>
+		<!-- Test dependencies for JavaFX -->
+		<dependency>
+			<groupId>org.testfx</groupId>
+			<artifactId>testfx-core</artifactId>
+			<version>4.0.16-alpha</version>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.testfx</groupId>
+			<artifactId>testfx-junit5</artifactId>
+			<version>4.0.16-alpha</version>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.testfx</groupId>
+			<artifactId>openjfx-monocle</artifactId>
+			<version>8u76-b04</version> <!-- jdk-11+26 for Java 11, jdk-9+181 for Java 9, 8u76-b04 for Java 8 -->
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.hamcrest</groupId>
+			<artifactId>hamcrest</artifactId>
+			<version>2.1</version>
+			<scope>test</scope>
+		</dependency>
 	</dependencies>
 	<build>
 		<plugins>

src/test/java/eu/simstadt/regionchooser/RegionChooserGUITest.java

+package eu.simstadt.regionchooser;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import java.nio.file.Paths;
+import java.util.concurrent.TimeoutException;
+import java.util.prefs.Preferences;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.testfx.api.FxRobot;
+import org.testfx.framework.junit5.ApplicationExtension;
+import org.testfx.framework.junit5.Start;
+import javafx.application.Platform;
+import javafx.stage.Stage;
+
+
+@ExtendWith(ApplicationExtension.class)
+class RegionChooserGUITest
+{
+	private static final String TEST_REPOSITORY_PATH = Paths.get("../../TestRepository").toAbsolutePath().toString();
+	private static String originalRepository;
+	private static Preferences userPrefs = Preferences.userRoot().node("/eu/simstadt/desktop");
+
+	private FxRobot robot;
+
+	@BeforeAll
+	/**
+	 * This method makes sure that the JavaFX/TestFX tests are run in headless mode. They should work on Linux Server,
+	 * thanks to https://github.com/TestFX/Monocle
+	 *
+	 * Alternatively, in order to force headless mode from Maven:
+	 *
+	 * mvn clean package -Dtestfx.robot=glass -Dtestfx.headless=true -Dprism.order=sw -Dprism.text=t2k
+	 *
+	 * More info:
+	 *
+	 * https://stackoverflow.com/questions/27403410/headless-testing-with-javafx-and-testfx
+	 * https://medium.com/@danielnenkov/run-testfx-tests-on-jenkins-running-on-ec2-d68197e10e2b
+	 */
+	private static void setupHeadlessTests() {
+		//		System.setProperty("testfx.robot", "glass");
+		//		System.setProperty("testfx.headless", "true");
+		//		System.setProperty("prism.order", "sw");
+		//		System.setProperty("prism.text", "t2k");
+	}
+
+	@BeforeAll
+	private static void setRepositoryToTestRepository() {
+		originalRepository = userPrefs.get("RECENT_REPOSITORY", TEST_REPOSITORY_PATH);
+		userPrefs.put("RECENT_REPOSITORY", TEST_REPOSITORY_PATH);
+	}
+
+	@AfterAll
+	private static void resetRepositoryToOriginalRepository() {
+		userPrefs.put("RECENT_REPOSITORY", originalRepository);
+	}
+
+	/**
+	 * Will be called with {@code @Before} semantics, i. e. before each test method.
+	 *
+	 * @param stage - Will be injected by the test runner.
+	 */
+	@Start
+	private void start(Stage stage) {
+		Platform.runLater(() -> new RegionChooserFX().start(stage));
+	}
+
+	/**
+	 * @param robot - Will be injected by the test runner.
+	 * @throws InterruptedException
+	 * @throws TimeoutException
+	 */
+	@Test
+	void testClickOnRegionChooser(FxRobot testRobot) throws InterruptedException, TimeoutException {
+		this.robot = testRobot;
+		System.out.println(robot.window(0).getScene());
+		System.out.println(robot.lookup("#RegionChooserBrowser").query());
+		//		WaitForAsyncUtils.waitFor(30, TimeUnit.SECONDS, () -> !runButton.isDisabled());
+		robot.clickOn("TEST");
+		assertTrue(false);
+	}
+}