This is a follow up of
It makes sense to make the following static fields package private instead of protected, as they are for test purpose and TestGenericTestUtils is in the same package as GenericTestUtils.
- protected static String E_NULL_THROWABLE = "Null Throwable";
- protected static String E_NULL_THROWABLE_STRING = "Null Throwable.toString() value";
- protected static String E_UNEXPECTED_EXCEPTION = "but got unexpected exception";
Meanwhile, we may need to make them final.