UserException Matching in Unit Tests

[Sudheesh Katkam]

Hey y’all,

I have added a ExpectedException rule and a UserExceptionMatcher to the unit 
test framework. This is useful for unit tests that expect UserExceptions (with 
expected type and message). The thrownException variable should be accessible 
from all test classes. Sample usage:

@Test
public void checkUserExceptionType() throws Exception {
  // UserException(ErrorType expectedType)
  thrownException.expect(new UserExceptionMatcher(VALIDATION));
  test(String.format("ALTER session SET `%s` = '%s';", 
ExecConstants.SLICE_TARGET, "fail"));
}

@Test
public void checkUserExceptionTypeAndMessage() throws Exception {
  // UserException(ErrorType expectedType, String expectedMessage)
  thrownException.expect(new UserExceptionMatcher(VALIDATION, "Option 
planner.slice_target must be of type LONG but you tried to set to STRING."));
  test(String.format("ALTER session SET `%s` = '%s';", 
ExecConstants.SLICE_TARGET, "fail"));
}

Note that the expected message should be contained in the actual message (i.e. 
actualMessage.contains(expectedMessage) comparison and not 
actualMessage.equals(expectedMessage) comparison).

Thank you,
Sudheesh