If we use It instead of it no tests are ran for the specified example.

For example, the following code will fail to output a spec failure even though the tested class doesn't exist:

public function ItReturnsZeroWithNoArguments()
{
    $this->spec(StringCalculator::add())->should->be(0);
}

Expected output:

PHP fatal error: Class 'StringCalculator' not found

or

A warning saying the example should start with "it" small caps

or

Accept "it" case insensitive since PHP doesn't enforce case sensibility for method names.