TestNG: How to test for mandatory exceptions?

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@Test(expectedExceptions) is useful for the most common cases:

  • You expect a specific exception to be thrown
  • You need the message of that exception to contain specific words

Per the documentation a test will fail if no expectedException is thrown:

The list of exceptions that a test method is expected to throw. If no exception or a different than one on this list is thrown, this test will be marked a failure.

Here are a few scenarios where @Test(expectedExceptions) is not sufficient:

  • Your test method has several statements and only one of them is expected to throw
  • You are throwing your own type of exception and you need to make sure it matches a certain criterion

In such cases, you should just revert to the traditional (pre-TestNG) pattern:

try {
  // your statement expected to throw
  fail();
}
catch(<the expected exception>) {
  // pass
}

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