assertEquals("Level 2", level2.getMessage());
        assertEquals("Level 3 - Root cause", level3.getMessage());
    }

    /**
     * Test serialization
     */
    public void test_serialization() throws Exception {
        String message = "Serialization test";
        Exception cause = new IOException("IO cause");
        CrawlerSystemException original = new CrawlerSystemException(message, cause);

        responseData4.setHttpStatusCode(404);
        assertFalse(rule.match(responseData4));
    }

    /**
     * Test Rule serialization
     */
    public void test_serialization() throws Exception {
        TestResponseProcessor processor = new TestResponseProcessor("serializeProcessor");
        TestRule originalRule = new TestRule("serializeRule", processor, true);

        // Serialize

            Predicates.in(differentOrder))
        .addEqualityGroup(Predicates.in(differentNums))
        .testEquals();
  }

  @J2ktIncompatible
  @GwtIncompatible // SerializableTester
  public void testIn_serialization() {
    checkSerialization(Predicates.in(Arrays.asList(1, 2, 3, null)));
  }

  public void testIn_handlesNullPointerException() {
    class CollectionThatThrowsNullPointerException<T> extends ArrayList<T> {