如何用 phpunit 模拟非抽象特征方法?

How to mock a non-abstract trait method with phpunit?

我有一个特征(被另一个特征使用)和一个我需要模拟的非抽象方法,但是当我尝试这样做时我收到错误消息:

Trying to configure method getOfficeDays which cannot be configured because it does not exist, has not been specified, is final, or is static

这是我要测试的代码:

trait OfficeDaysTrait {
  public function getOfficeDays(): array {
    // This normally calls the database, that's why I want to mock it in tests
    return [
     [
       'day' => 'mon',
       'openingTime' => '08:00:00',
       'closingTime' => '17:00:00'
     ]
    ];
  }
}

trait EmployeeAttendenceTrait {
  use OfficeDaysTrait;

  public function isLate($today)
  {
     $late = false;
     $officeDays = $this->getOfficeDays();

     // compare logic with today.. whether the employee is late or not

     return $late;
  }
}

这是我的测试方法体:

$mock = $this->getMockForTrait(EmployeeAttendenceTrait::class); 

$mock->expects($this->once())
 ->method('getOfficeDays')
 ->will([])
;

$this->assertTrue($mock->isLate());

此语法基于 phpunit's documentation for testing traits

中显示的示例

为什么我会收到此错误消息以及如何模拟 getOfficeDays 才能测试我的 isLate 方法?

没有被mock过的方法不能有期望

我将在下面详细介绍,但是:

$mock = $this->getMockForTrait(EmployeeAttendenceTrait::class); 

没有模拟任何方法,因此 $mock 等同于:

class Testing extends PHPUnitsInternalMockStub
{
    use EmployeeAttendenceTrait;
}

$mock = new Testing;

检查错误信息

错误信息如下:

Trying to configure method getOfficeDays which cannot be configured because it does not exist, has not been specified, is final, or is static

让我们看看每一种可能性(几乎依次)

不存在

代码 看起来 显然有一个名为 getOfficeDays 的方法 - 如果有疑问,使用 get_class_methods 会澄清:

<?php

use PHPUnit\Framework\TestCase;

class SOTest extends TestCase
{

  public function testMethods()
  {
    $mock = $this->getMockForTrait(EmployeeAttendenceTrait::class);
    print_r(get_class_methods($mock));
  }
}

输出:

R                                                                   1 / 1 (100%)Array
(
    [0] => __clone
    [1] => expects
    [2] => method
    [3] => __phpunit_setOriginalObject
    [4] => __phpunit_getInvocationMocker
    [5] => __phpunit_hasMatchers
    [6] => __phpunit_verify
    [7] => isLate
    [8] => getOfficeDays
)


Time: 569 ms, Memory: 12.00MB

There was 1 risky test:

1) SOTest::testMethods
This test did not perform any assertions

所以不是那样。

是最终的

public function getOfficeDays(): array {

方法签名显然没有 declare the method as final - 所以不是那样。

或者是静态的

public function getOfficeDays(): array {

方法签名很清楚is also not static - 所以也不是那样。

尚​​未指定

根据逻辑推论,这个 是问题所在 - 而且它是唯一一个需要对使用 phpunit 有所了解的问题。

docs for getMockForTrait阅读(强调):

The getMockForTrait() method returns a mock object that uses a specified trait. All abstract methods of the given trait are mocked. This allows for testing the concrete methods of a trait.

由于 none 特征方法是抽象的,因此不应使用问题中的语法模拟任何方法。更深入地看,method signature for getMockForTrait 有更多参数:

    /**
     * Returns a mock object for the specified trait with all abstract methods
     * of the trait mocked. Concrete methods to mock can be specified with the
     * `$mockedMethods` parameter.
     *
     * @throws RuntimeException
     */
    public function getMockForTrait(
        string $traitName, 
        array $arguments = [], 
        string $mockClassName = '', 
        bool $callOriginalConstructor = true, 
        bool $callOriginalClone = true, 
        bool $callAutoload = true, 
        array $mockedMethods = [], 
        bool $cloneArguments = true): MockObject

有一个参数用于指定明确模拟的方法,因此可以这样编写测试:

class SOTest extends TestCase
{

  public function testMethods()
  {
    $mock = $this->getMockForTrait(
      EmployeeAttendenceTrait::class, 
      [],   # These
      '',   # are
      true, # the
      true, # defaults
      true, #
      ['getOfficeDays']
    );

    $mock->expects($this->once())
     ->method('getOfficeDays')
     ->willReturn([]);

    $today = new DateTime(); // or whatever is appropriate
    $this->assertTrue($mock->isLate($today));
  }
}

将生成一个有效的模拟对象并允许测试 运行。