} catch (AssertionFailedError error) {
      // expected
      assertContains("must be equal to the Object#hashCode", error.getMessage());
    }
    assertFalse(errorNotThrown);
  }

  public void testObjectWhichIsEqualButChangesClass() {
    ObjectWhichIsEqualButChangesClass orig = new ObjectWhichIsEqualButChangesClass();
    boolean errorNotThrown = false;
    try {
      SerializableTester.reserializeAndAssert(orig);