PHP Unit testing a class w/ traits

Question

I've just started using PHP and am writing some test for some legacy code. I have a class here that has a trait. How can I test that class's method that utilizes a trait's method within a function?

trait Cooltrait
{
  public function extractMethod($z){
     return $z[0];
  }
}

class Awesome
{
  using Cooltrait

  public function handlesomething($x, $y){
    $var1 = $this->extractMethod($x)

    if(!is_null($var1)){
      return true;
    }

    return false;
  }
}

I need to test if $var1 is null or not in the class but I'm using this trait's method. Anyone encountered how to best mock / stub a trait in a class for testing the hadlesomething function in the Awesome class? (edited to clarify question).

Answer 1

If you're testing Awesome you can assume that the trait is part of it at runtime. If you want to test Cooltrait in isolation, you can use getMockForTrait.

In this case; "I need to test if $var1 is null or not", it's the former - assume that the trait is already applied when you're testing it.

Note: the syntax is use, not using.

public function testVarIsNull()
{
    $awesome = new Awesome;
    $result = $awesome->handlesomething(array(null), 'not relevant in your example');
    $this->assertFalse($result);

    $result = $awesome->handlesomething(array('valid'), 'not relevant in your example');
    $this->assertTrue($result);
}

Since extractMethod is public, you could also test that method in isolation:

public function testExtractMethodShouldReturnFirstArrayEntry()
{
    $awesome = new Awesome;
    $this->assertSame('foo', $awesome->extractMethod(array('foo')));
}

... or using getMockForTrait:

public function testExtractMethodShouldReturnFirstArrayEntry()
{
    $cooltrait = $this->getMockForTrait('Cooltrait');
    $this->assertSame('foo', $cooltrait->extractMethod(array('foo')));
}