Assert multiple conditions in a single test, or split into multiple tests? [duplicate]

Question

If you were testing a count function like the one below, is it considered to be 'right' or 'wrong' to test multiple things for the function in one function vs having a test function for each of the tests?

function testGetKeywordCount() {
    $tester = $this -> getDatabaseTester($this -> CompleteDataFile);
    $tester -> onSetUp();

    $KeywordID = 0;
    $this -> setExpectedException('InvalidArgumentException');
    $this -> keyword -> getKeywordCount($KeywordID,'Active');

    $KeywordID = 1;
    $this -> setExpectedException('InvalidArgumentException');
    $this -> keyword -> getKeywordCount($KeywordID,'InvalidStatus');

    $this -> assertEquals(1, $this -> keyword -> getKeywordCount($KeywordID,'Active'));

    $tester -> onTearDown();
}

Answer 1

You should have multiple test functions, where each tests its own condition. That way it is easier to spot a failure without debugging.