Java: Add printAST test with javadoc

Author: tamasvajk

java/ql/test/library-tests/printAst/A.java

@@ -56,4 +56,18 @@ void varDecls(Object[] things) {
            return;
        }
    }
+
+   enum E {
+    /**
+     * Javadoc for enum constant
+     */
+    A,
+    B,
+    C;
+   }
+
+   /**
+    * Javadoc for fields
+    */
+    int i, j, k;
 }