phpunit 自定义断言需要帮助

Question

我正在尝试按照本教程向 phpunit 添加自定义断言，验证作为字符串返回的复数（例如

“-123+456i”

（通过我正在测试的方法）达到实部和虚部的定义精度。我已经放置了一个 Complex.php 类来将字符串解析为实部和虚部，并将以下断言类放在一起作为 complexAssert.php：

require_once 'PHPUnit/Framework/Assert.php';
include_once getcwd().'/custom/Complex.php';

class complexAssert extends PHPUnit_Framework_Assert {

    public function assertComplexEquals($expected, $actual, $message = '', $delta = 0)
    {
        $expectedComplex = new Complex($expected);
        $actualComplex = new Complex($actual);

        if (!($actualComplex->getReal() >= ($expectedComplex - $delta) &&
            $actualComplex->getReal() <= ($expectedComplex + $delta))) {
            return $this->fail($message);
        }

        if (!($actualComplex->getImaginary() >= ($expectedComplex - $delta) &&
            $actualComplex->getImaginary() <= ($expectedComplex + $delta))) {
            return $this->fail($message);
        }

    }
}

我的单元测试脚本：

require_once getcwd().'/custom/complexAssert.php';
require_once 'testDataFileIterator.php';

class EngineeringTest extends PHPUnit_Framework_TestCase
{
    /**
     * @dataProvider providerIMSUM
     */
    public function testIMSUM()
    {
        $args = func_get_args();
        $expectedResult = array_pop($args);
        $result = call_user_func_array(array('PHPExcel_Calculation_Engineering','IMSUM'),$args);
        $this->assertComplexEquals($expectedResult, $result);
    }

    public function providerIMSUM()
    {
        return new testDataFileIterator('rawTestData/Calculation/Engineering/IMSUM.data');
    }
}

当我只是做了一个assertEquals...但现在我添加了包含并更改为我的新断言，它崩溃了，声称它无法调用未定义的方法assertComplexEquals()。

有没有人成功地使用自定义断言扩展 phpunit，并且可以看到我做错了什么？

Answer 1

显然，让 $this->someCustomAssertion 工作的唯一方法是扩展 PHPUnit_Framework_TestCase 并在那里创建包装方法，或者静态调用自定义断言。

例如，Zend Framework 只是使用附加方法（断言）扩展 PHPUnit_Framework_TestCase

Answer 2

最后，我选择不扩展现有的断言，而是修改复杂的断言逻辑以返回一个简单的布尔值，然后可以使用assertTrue()对其进行测试，并使用可以使用简单的getMessage()检索的错误消息用于在 phpunit 结果中显示。说实话，用这种方式感觉容易多了

include_once __DIR__.'/Complex.php';

class complexAssert {

    private $_errorMessage = '';

    public function assertComplexEquals($expected, $actual, $delta = 0)
    {
        $expectedComplex = new Complex($expected);
        $actualComplex = new Complex($actual);

        if ($actualComplex->getReal() < ($expectedComplex->getReal() - $delta) ||
            $actualComplex->getReal() > ($expectedComplex->getReal() + $delta)) {
            $this->_errorMessage = 'Mismatched Real part: ' .
                                   $actualComplex->getReal() . 
                                   ' !== ' . 
                                   $expectedComplex->getReal();
            return FALSE;
        }

        if ($actualComplex->getImaginary() < ($expectedComplex->getImaginary() - $delta) ||
            $actualComplex->getImaginary() > ($expectedComplex->getImaginary() + $delta)) {
            $this->_errorMessage = 'Mismatched Imaginary part: ' .
                                   $actualComplex->getImaginary() . 
                                   ' !== ' . 
                                   $expectedComplex->getImaginary();
            return FALSE;
        }

        return TRUE;
    }

    public function getErrorMessage() {
        return $this->_errorMessage;
    }
}

我的单元测试脚本：

//  Custom assertion class for handling precision of Complex numbers
require_once __DIR__.'/../../custom/complexAssert.php';
//  Data Provider handler
require_once 'testDataFileIterator.php';

class EngineeringTest extends PHPUnit_Framework_TestCase
{
    /**
     * @dataProvider providerIMSUM
     */
    public function testIMSUM()
    {
        $args = func_get_args();
        $expectedResult = array_pop($args);
        $result = call_user_func_array(array('PHPExcel_Calculation_Engineering','IMSUM'),$args);
        $complexAssert = new complexAssert();
        $this->assertTrue($complexAssert->assertComplexEquals($expectedResult, $result, 1E-8),
                          $complexAssert->getErrorMessage());
    }

    public function providerIMSUM()
    {
        return new testDataFileIterator('rawTestData/Calculation/Engineering/IMSUM.data');
    }
}

并且记录的 phpunit 结果足够清晰：

3) EngineeringTest::testIMSUB with data set #7 ('-12.34-5.67i', '-123.45-67.89', '#NUM!')
Mismatched String: 111.11 !== #NUM!
Failed asserting that false is true.