Add the first few Java 19 tests

For now, only the "pattern matching for switch" tests from previews 1
and 2 were adjusted to work in preview 3, because guarded patterns were
replaced by 'when' clauses in 'switch' blocks. Therefore, existing test
classes did not compile anymore and had to be replaced by syntactically
upgraded versions with content merged from preview 1 and 2 classes.

Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>

2 files changed, 67 insertions, 0 deletions

diff --git a/testing/src/test/java/org/aspectj/testing/XMLBasedAjcTestCaseForJava19Only.java b/testing/src/test/java/org/aspectj/testing/XMLBasedAjcTestCaseForJava19Only.java
new file mode 100644
index 000000000..e0a99283d
--- /dev/null
+++ b/testing/src/test/java/org/aspectj/testing/XMLBasedAjcTestCaseForJava19Only.java
@@ -0,0 +1,40 @@
+/* *******************************************************************
+ * Copyright (c) 2022 Contributors
+ * All rights reserved.
+ * This program and the accompanying materials are made available
+ * under the terms of the Eclipse Public License v 2.0
+ * which accompanies this distribution and is available at
+ * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.txt
+ * ******************************************************************/
+package org.aspectj.testing;
+
+import org.aspectj.util.LangUtil;
+
+/**
+ * Makes sure tests are running on the right level of JDK.
+ *
+ * @author Alexander Kriegisch
+ */
+public abstract class XMLBasedAjcTestCaseForJava19Only extends XMLBasedAjcTestCase {
+
+	@Override
+	public void setUp() throws Exception {
+		// Activate this block after upgrading to JDT Core Java 20
+		/*
+		throw new IllegalStateException(
+			"These tests need a Java 19 level AspectJ compiler " +
+				"(e.g. because they use version-specific preview features). " +
+				"This compiler does not support preview features of a previous version anymore."
+		);
+		*/
+		// Activate this block before upgrading to JDT Core Java 20
+		if (!LangUtil.is19VMOrGreater() || LangUtil.is20VMOrGreater()) {
+			throw new IllegalStateException(
+				"These tests should be run on Java 19 only " +
+				"(e.g. because they use version-specific preview features)"
+			);
+		}
+		super.setUp();
+	}
+
+}
diff --git a/testing/src/test/java/org/aspectj/testing/XMLBasedAjcTestCaseForJava19OrLater.java b/testing/src/test/java/org/aspectj/testing/XMLBasedAjcTestCaseForJava19OrLater.java
new file mode 100644
index 000000000..95beffef5
--- /dev/null
+++ b/testing/src/test/java/org/aspectj/testing/XMLBasedAjcTestCaseForJava19OrLater.java
@@ -0,0 +1,27 @@
+/* *******************************************************************
+ * Copyright (c) 2022 Contributors
+ * All rights reserved.
+ * This program and the accompanying materials are made available
+ * under the terms of the Eclipse Public License v 2.0
+ * which accompanies this distribution and is available at
+ * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.txt
+ * ******************************************************************/
+package org.aspectj.testing;
+
+import org.aspectj.util.LangUtil;
+
+/**
+ * Makes sure tests are running on the right level of JDK.
+ *
+ * @author Alexander Kriegisch
+ */
+public abstract class XMLBasedAjcTestCaseForJava19OrLater extends XMLBasedAjcTestCase {
+
+	@Override
+	public void setUp() throws Exception {
+		if (!LangUtil.is19VMOrGreater())
+			throw new IllegalStateException("These tests should be run on Java 19 or later");
+		super.setUp();
+	}
+
+}