Symfony 2.8中的单元测试运行速度比预期慢了数百倍 SimpleTest.php phpunit.xml PHPUnit运行输出 codeception.yml 代码接收运行输出

我正在将单元测试添加到以前从未有过的旧Symfony 2.8生产代码库中，因此可以将Symfony升级到维护版本。由于我们当前正在运行的PHP 5.5也将不再维护，因此我们还将升级PHP，但是如果Symfony 2.8在PHP 7.3下运行，则会抛出太多错误。

尽管我能够在PHPUnit和Codeception（由PHPUnit提供支持）下运行单元测试，但是它们的运行速度却非常慢。

例如：

SimpleTest.php

<?php
class SimpleTest extends PHPUnit_Framework_TestCase {
  public function testShouldDoNothing() {
    $this->assertTrue(true);
  }
}

phpunit.xml

<?xml version="1.0" encoding="UTF-8"?>
<phpunit bootstrap="vendor/autoload.php" colors="true">
    <php>
        <server name="KERNEL_DIR" value="app/"/>
    </php>
    <testsuites>
        <testsuite name="Application Test Suite">
            <directory>tests/unit</directory>
        </testsuite>
    </testsuites>
</phpunit>

PHPUnit运行输出

PHPUnit 4.8.36 by Sebastian bergmann and contributors.

Runtime:        PHP 5.5.9 with Xdebug 2.5.5

.

Time: 19.52 seconds,Memory: 6.00MB

OK (1 test,1 assertion)

codeception.yml

paths:
    tests: tests
    output: tests/_output
    data: tests/_data
    support: tests/_support
    envs: tests/_envs
actor_suffix: Tester
extensions:
    enabled:
        - Codeception\Extension\RunFailed
coverage:
    enabled: true
    include:
        - src/*
    low_limit: 50
    high_limit: 100

代码接收运行输出

Codeception PHP Testing Framework v2.3.9
Powered by PHPUnit 4.8.36 by Sebastian bergmann and contributors.

Unit Tests (1) --------------------------------------------------
Testing unit
+ SimpleTest: Should do nothing (0.29s)
-----------------------------------------------------------------

Time: 30.96 seconds,Memory: 23.25MB

OK (1 test,1 assertion)

此测试应始终在0.00s中运行，并且总时间应少于5 seconds，而不是20 seconds或更多。

如何在PHP 5.5中的Symfony 2.8下加速单元测试？

我已将问题归结为运行PHP 5.5，目前这是必需的。我用PHP 5.5创建了一个普通的Symfony 2.8安装，没有代码，测试仍然非常慢。当我切换到PHP 7.3时，测试的速度与过去预期的一样快，但是，我们的项目尚未在PHP 7.3下运行，因为它会导致致命错误。

D:\server\Apache24\htdocs\symfony-2.8>php55 vendor\codeception\codeception\codecept run unit
Codeception PHP Testing Framework v2.3.9
Powered by PHPUnit 4.8.36 by Sebastian bergmann and contributors.

Unit Tests (1) --------------------------------------------------
+ SimpleTest: Should do nothing (0.20s)
-----------------------------------------------------------------

Time: 21.84 seconds,Memory: 14.50MB

OK (1 test,1 assertion)

D:\server\Apache24\htdocs\symfony-2.8>php73 vendor\codeception\codeception\codecept run unit
Codeception PHP Testing Framework v2.3.9
Powered by PHPUnit 4.8.36 by Sebastian bergmann and contributors.

Unit Tests (1) --------------------------------------------------
+ SimpleTest: Should do nothing (0.00s)
-----------------------------------------------------------------

Time: 264 ms,Memory: 10.00MB

OK (1 test,1 assertion)