Friday, July 12, 2013

Using An Existing Method on a Mocked Object

Problem: You want to use an existing method in a class for unit testing in a mocked object but cannot use it because the method is returning an error when called.

Example:
class A
{
    public function methodA()
    {
        return "Hello";
    }
}

Unit test:
$mock = $this->getMockBuilder('A')
             ->getMock();
$mock->methodA(); // returns an error

Solution: 
$mock = $this->getMockBuilder('A')
             ->setMethod(null) // the trick is explicitly using a null
             ->getMock();
$mock->methodA(); // returns "Hello"

For the curious, what will happen if you pass an empty array:
$mock = $this->getMockBuilder('A')
             ->setMethod(array())
             ->getMock();
$mock->methodA(); // returns null

You shouldnt really do this at all because you can just instantiate class A after but its just a good thing to know!

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