How about to use a CI (Continuous Integration)?

Rather than break a core file, I’ve added test.php to the repo, which has an incorrect assertion and should fail.
The incorrect assertion is $this->assertEquals(1+1,1);

If you want to correct the assertion @glyn.hudson hopefully it will then pass OK.

$this->assertEquals(1+1, 2);

Paul

Edit - yes it fails. Travis log extract added below clearly indicating what the problem is.