Symfony2&；Phpunit为什么\Phpunit\u Framework\u测试用例工作，而Phpunit\Framework\TestCase不工作？

为了尝试一些东西，我有一个小型的Symfony2项目，我编写了以下测试类：

namespace AppBundle\Tests\Managers\CRUD;

// use PHPUnit\Framework\TestCase;

class PersonManagerTest extends \PHPUnit_Framework_TestCase
{
  public function testTrue()
  {
    print "Test True";
    $this->assertTrue(true);
  }
}

这是应该的，但如果我尝试这样重构：

namespace AppBundle\Tests\Managers\CRUD;

use PHPUnit\Framework\TestCase;

class PersonManagerTest extends TestCase
{
  public function testTrue()
  {
    print "Test True";
    $this->assertTrue(true);
  }
}

我得到以下错误：

PHP致命错误：在第8行的/home/pcmagas/Kwdikas/PHP/apps/sjonapi/src/AppBundle/Tests/Managers/CRUD/PersonManagerTest.PHP中找不到类“TestCase”

我想知道为什么会这样

我的composer.json是：

{
    "name" : "pcmagas/sjonapi",
    "license" : "WFPL",
    "type" : "project",
    "autoload" : {
        "psr-4" : {
            "" : "src/"
        },
        "classmap" : [
            "app/AppKernel.php",
            "app/AppCache.php"
        ]
    },
  "repositories": [{
      "type": "vcs",
      "url": "/home/pcmagas/Kwdikas/php/non-web/pcmagas-libs"
  }],
    "require" : {
        "php" : ">=5.3.9",
        "symfony/symfony" : "2.8.*",
        "doctrine/orm" : "^2.5",
        "doctrine/doctrine-bundle" : "~1.4",
        "doctrine/common": "~2.5",
        "doctrine/doctrine-cache-bundle": "^1.2",
        "symfony/swiftmailer-bundle" : "~2.3",
        "symfony/monolog-bundle" : "~2.4",
        "sensio/distribution-bundle" : "~5.0",
        "sensio/framework-extra-bundle" : "^3.0.2",
        "incenteev/composer-parameter-handler" : "~2.0",
        "nilportugues/jsonapi-bundle" : "^1.5",
        "pcmagas/libs": "dev-master",
        "doctrine/annotations": "^1.3"
    },
    "require-dev" : {
        "sensio/generator-bundle" : "~3.0",
        "symfony/phpunit-bridge" : "~2.7",
    "phpunit/phpunit": "5.5.*"
    },
    "scripts" : {
        "post-install-cmd" : [
            "@symfony-scripts"
        ],
        "post-update-cmd" : [
            "@symfony-scripts"
        ]
    },
    "config" : {
        "bin-dir" : "bin"
    },
    "extra" : {
        "symfony-app-dir" : "app",
        "symfony-web-dir" : "web",
        "symfony-assets-install" : "relative",
        "incenteev-parameters" : {
            "file" : "app/config/parameters.yml"
        },
        "map": [
                    [
                        "*",
                        "CommonLibs\\Helpers",
                        "CommonLibs\\Interfaces"
                    ]
              ]
    },
    "description" : "A simple Demo using JSON API"
}

---

非常确定PHPUnit直到6.x才采用名称空格。

PHPUnit\Framework\TestCase

在5.4.3中作为前向兼容性别名添加（在5.4.0中，它最初作为

PHPUnit\Framework\TestCase

）。