CODEWITHSUNDEEP
phpunit-testing
John Smith
John Smith

Reputation: 6197

Phpunit, mock / modify a method parameter itself

Class Testme
{
    public function testMe ($input, &$output)
    {
        $output = 9;
    }
}

as you all can see, this method modifies an input parameter. Now how to mock it? Something like mocking the return value

$mock = $this->getMock ('Testme');
$mock = $this->expects ($this->once())->with (1, 0)->will

what to write here to modify the 2nd parameter? I want the 2nd parameter to be 10.

Upvotes: 2

Views: 2211

Answers (2)

h43ckm43ck
h43ckm43ck

Reputation: 84

Unfortunately this is not possible if you use PHPUnit Mock Objects. See known issue #81 "Arguments that are passed by reference are not handled properly.

I would recommend to use Prophecy instead. Prophecy will be supported by default in PHPUnit >= 4.5. In the meanwhile you can include phpspec/prophecy-phpunit, which integrates prophecy in PHPUnit.

Here is a use case with Prophecy:

namespace SchlimmerFinger;

use Prophecy\PhpUnit\ProphecyTestCase;

class MockWithReferenceTest extends ProphecyTestCase
{
    public function testShouldChangeValue()
    {
        $foo = $this->prophesize(__NAMESPACE__ . '\\Foo');

        $a = 20;
        $b = 35;
        $c = 22;

        $foo->bar($a, $b, $c)->will(function(array $arguments) use (&$b){
            $arguments[1] = $b = 10;
            return array_sum($arguments);
        });

        self::assertEquals(52, $foo->reveal()->bar($a, $b, $c));
        self::assertEquals(10, $b);
    }
}

class Foo
{
    public function bar($a, &$b, $c)
    {
    }
}

Upvotes: 2

sata
sata

Reputation: 288

 $mock = $this->getMock('Testme');
 $mock->expects($this->once())
     ->method('testMe')
     ->with(1, 0)
     ->will(
         $this->returnCallback(
             function ($input, &$output) {
                 $output = 10;
             }
         )
     );

but beware! it still wouldn't work, cause of twice calling (issue: https://github.com/sebastianbergmann/phpunit-mock-objects/issues/181)

you can work around this with this solution: https://github.com/sebastianbergmann/phpunit-mock-objects/issues/181#issuecomment-52289669

Upvotes: 2

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