getAll(); $all['password_validation'] = [ function ($pw) { if ($pw === 'fail') { return 'test_fail'; } } ]; unset($all['min_password_length']); $c->setAll($all); parent::setUp(); } public function testBasic() { // anything except 'fail' should work. $this->assertEmpty(validate_password('str')); $this->assertEquals([], validate_password('1234asdf')); $this->assertEquals(['test_fail'], validate_password('fail')); } }