Fix failing test and add new test case

java/ql/test/query-tests/EmptyMethod/Class1.java

@@ -0,0 +1,46 @@
+import org.aspectj.lang.annotation.Pointcut;
+
+public class Class1 {
+
+  // COMPLIANT
+  public void f() {
+    int i = 0;
+  }
+
+  // COMPLIANT
+  public void f1() {
+    // intentionally empty
+  }
+
+  // NON_COMPLIANT
+  public void f2() { } // $ Alert
+
+  // COMPLIANT - exception
+  @Pointcut()
+  public void f4() {
+  }
+
+  public abstract class TestInner {
+
+    public abstract void f(); // COMPLIANT - intentionally empty
+
+  }
+
+  public class Derived extends TestInner {
+
+    // COMPLIANT: with annotation
+    @Override
+    public void f() {
+    }
+
+    // COMPLIANT: native
+    public native int nativeMethod();
+  }
+
+  public interface TestInterface {
+
+    // NON_COMPLIANT
+    default void method() { } // $ Alert
+  }
+
+}