PHPUnit and specking method aliasing - php

Question

Consider this class
class Foo {
public function alias_method($input) {
return $this->actual_method($input);
}
public function actual_method($input) {
# Do something
}
}
Now, I have already written tests that verify the behavior of actual_method, so for alias_method, all I want to ensure is that it calls actual_method with $input.
How can I do this?

Answer 1

As you've asked for a code-example, this is a PHPUnit test method body that has your expectation set-up already:
/**
* TODO Find out whether or not the test is necessary
*
* Note: This example is a slight adoption from the Observer/Subject
* mock example from PHPUnit docs:
* Example 9.11: Testing that a method gets called once and with
* a specified argument
*
* #link http://phpunit.de/manual/current/en/test-doubles.html
*
* #test
*/
public function methodIsCalledWithInputArgument()
{
// Create an Input object to test with as method argument
$input = new Input();
// Create a mock for the Foo class,
// only mock the actual_method() method.
$foo = $this->getMock('Foo', array('actual_method'));
// Set up the expectation for the actual_method() method
// to be called only once and with the argument $input
// as its parameter.
$foo->expects($this->once())
->method('actual_method')
->with($this->identicalTo$(input))
;
// Call the alias_method() method on the $foo object
// which we expect to call the mocked Foo object's
// actual_method() method with $input.
$foo->alias_method($input);
}