test: add NotYetImplemented feature (PR #495)

jadx-core/src/test/java/jadx/NotYetImplemented.java

+package jadx;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Indicates a test which is known to fail.
+ * 
+ * <p>This would cause a failure to be considered as success and a success as failure,
+ * with the benefit of updating the related issue when it has been resolved even unintentionally.</p>
+ * 
+ * <p>To have an effect, the test class must be annotated with:
+ * 
+ * <code>
+ *      &#064;ExtendWith(NotYetImplementedExtension.class)
+ * </code>
+ * </p>
+ */
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ElementType.TYPE, ElementType.METHOD})
+public @interface NotYetImplemented {
+}

jadx-core/src/test/java/jadx/NotYetImplementedExtension.java

+package jadx;
+
+import java.lang.reflect.Method;
+import java.util.HashSet;
+import java.util.Set;
+
+import org.junit.jupiter.api.extension.AfterTestExecutionCallback;
+import org.junit.jupiter.api.extension.ExtensionContext;
+import org.junit.jupiter.api.extension.TestExecutionExceptionHandler;
+
+public class NotYetImplementedExtension implements AfterTestExecutionCallback, TestExecutionExceptionHandler {
+
+	private Set<Method> knownFailedMethods = new HashSet<>();
+
+	@Override
+	public void handleTestExecutionException(ExtensionContext context, Throwable throwable) throws Throwable {
+		if (!isNotYetImplemented(context)) {
+			throw throwable;
+		}
+		knownFailedMethods.add(context.getTestMethod().get());
+	}
+
+	@Override
+	public void afterTestExecution(ExtensionContext context) throws Exception {
+		if (!knownFailedMethods.contains(context.getTestMethod().get())
+				&& isNotYetImplemented(context)
+				&& !context.getExecutionException().isPresent()) {
+			throw new AssertionError("Test "
+					+ context.getTestClass().get().getName() + '.' + context.getTestMethod().get().getName()
+					+ " is marked as @NotYetImplemented, but passes!");
+		}
+	}
+
+	private static boolean isNotYetImplemented(ExtensionContext context) {
+		return context.getTestMethod().get().getAnnotation(NotYetImplemented.class) != null
+				|| context.getTestClass().get().getAnnotation(NotYetImplemented.class) != null;
+	}
+
+}