How to unit test PHP traits

I want to know if there is a solution on how to unit-test a PHP trait.

I know we can test a class which is using the trait. but I was wondering if there are better approaches.

Thanks for any advice in advance :)

EDIT

One alternative is to use the Trait in the test class itself as I'm going to demonstrate bellow.

But I`m not that keen on this approach since there is no guaranty there are not similar method names between the trait , the class and also the PHPUnit_Framework_TestCase(in this example):

Here is an example trait:

trait IndexableTrait
{
    /** @var int */
    private $index;

    /**
     * @param $index
     * @return $this
     * @throw InvalidArgumentException
     */
    public function setIndex($index)
    {
        if (false === filter_var($index, FILTER_VALIDATE_INT)) {
            throw new InvalidArgumentException('$index must be integer.');
        }

        $this->index = $index;

        return $this;
    }

    /**
     * @return int|null
     */
    public function getIndex()
    {
        return $this->index;
    }
}

and its test:

class TheAboveTraitTest extends PHPUnit_Framework_TestCase
{
    use TheAboveTrait;

    public function test_indexSetterAndGetter()
    {
        $this->setIndex(123);
        $this->assertEquals(123, $this->getIndex());
    }

    public function test_indexIntValidation()
    {
        $this->setExpectedException(Exception::class, '$index must be integer.');
        $this->setIndex('bad index');
    }
}

---

You can test a Trait using a similar to testing an Abstract Class' concrete methods.

PHPUnit has a method getMockForTrait which will return an object that uses the trait. Then you can test the traits functions.

Here is the example from the documentation:

<?php
trait AbstractTrait
{
    public function concreteMethod()
    {
        return $this->abstractMethod();
    }

    public abstract function abstractMethod();
}

class TraitClassTest extends PHPUnit_Framework_TestCase
{
    public function testConcreteMethod()
    {
        $mock = $this->getMockForTrait('AbstractTrait');

        $mock->expects($this->any())
             ->method('abstractMethod')
             ->will($this->returnValue(TRUE));

        $this->assertTrue($mock->concreteMethod());
    }
}
?>

链接地址: http://www.djcxy.com/p/69372.html

上一篇: 使用抽象类而不是特征的优点是什么？

下一篇: 如何对PHP特性进行单元测试