Add Java 16 test suite for AspectJ 1.9.7 + test refactorings

- Test all features which were preview in 14+15 and are now final in 16,
  compiling them with language level 16.
- For Java 15 we only have sanity tests (and of course the Java <14
  tests), compiling Java 16 features to target 15 does not seem to work.
- Test remaining Java 16 preview feature (sealed classes).
- Instead of overriding runTest(String) in several base classes like
  XMLBasedAjcTestCaseForJava*Only or XMLBasedAjcTestCaseForJava*OrLater,
  we now override setUp() from JUnit's TestCase base class. This will
  run before runTest(String) and make the tests fail much faster, if a
  user tries to run them on the wrong VM.

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

1 files changed, 4 insertions, 0 deletions

diff --git a/util/src/main/java/org/aspectj/util/LangUtil.java b/util/src/main/java/org/aspectj/util/LangUtil.java
index a0535d389..8128174aa 100644
--- a/util/src/main/java/org/aspectj/util/LangUtil.java
+++ b/util/src/main/java/org/aspectj/util/LangUtil.java
@@ -186,6 +186,10 @@ public class LangUtil {
 		return 16 <= vmVersion;
 	}
 
+	public static boolean is17VMOrGreater() {
+		return 17 <= vmVersion;
+	}
+
 	/**
 	 * Shorthand for "if null, throw IllegalArgumentException"
 	 *