Improve LauncherFactoryTests

Author: marcphilipp

platform-tests/src/test/java/org/junit/platform/launcher/TestLauncherSessionListener.java

@@ -10,21 +10,19 @@
 
 package org.junit.platform.launcher;
 
+import org.jspecify.annotations.Nullable;
+
 public class TestLauncherSessionListener implements LauncherSessionListener {
 
+	public static @Nullable LauncherSession session;
+
 	@Override
-	public boolean equals(Object obj) {
-		if (this == obj) {
-			return true;
-		}
-		if (obj == null) {
-			return false;
-		}
-		return getClass() == obj.getClass();
+	public void launcherSessionOpened(LauncherSession session) {
+		TestLauncherSessionListener.session = session;
 	}
 
 	@Override
-	public int hashCode() {
-		return 1;
+	public void launcherSessionClosed(LauncherSession session) {
+		TestLauncherSessionListener.session = null;
 	}
 }

platform-tests/src/test/java/org/junit/platform/launcher/core/LauncherFactoryTests.java

@@ -250,9 +250,10 @@ void doesNotDiscoverLauncherSessionListenerViaServiceApiWhenDisabled() {
 	@Test
 	void discoversLauncherSessionListenerViaServiceApiByDefault() {
 		withTestServices(() -> {
-			try (var session = (DefaultLauncherSession) LauncherFactory.openSession()) {
-				assertThat(session.getListener()).isEqualTo(new TestLauncherSessionListener());
+			try (var session = LauncherFactory.openSession()) {
+				assertThat(TestLauncherSessionListener.session).isSameAs(session);
 			}
+			assertThat(TestLauncherSessionListener.session).isNull();
 		});
 	}