Phpunit在给定空后缀时尝试包含目录

我正在尝试在我的新项目上运行测试。目录布局如下:

src/ (project's code here)    
test/
    EviType/
        Main.php
    phpunit.xml
composer.json

Phpunit安装了composer(所谓的每项目依赖):

{
    "require-dev": {
        "phpunit/phpunit": ">=3.7.5"
    },
}

我用--dev选项运行composer install/update。

Phpunit配置被定义为一个极简的test/phpunit.xml:

<?xml version="1.0" encoding="utf-8"?>
<phpunit colors="true">
    <testsuites>
        <testsuite>
            <directory suffix="">EviType</directory>
        </testsuite>
    </testsuites>
</phpunit>

test/EviType/Main.php中的测试代码也尽可能短:

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

所以当我运行phpunit:

php54 -C vendor/bin/phpunit -c test/

(系统安装了多个php版本，php54是/usr/local/php54/bin/php的别名)

我得到了几个简洁的警告消息:

X-Powered-By: PHP/5.4.5
Content-type: text/html
<br />
<b>Warning</b>:  include_once(/path/to/docs/test): failed to open stream: Success in <b>/path/to/docs/vendor/phpunit/phpunit/PHPUnit/Util/Fileloader.php</b> on line <b>92</b><br />
<br />
<b>Warning</b>:  include_once(): Failed opening '/path/to/docs/test' for inclusion (include_path='/path/to/docs/vendor/phpunit/phpunit/:/path/to/docs/vendor/phpunit/phpunit/../../symfony/yaml:/path/to/docs/vendor/phpunit/phpunit/vendor/phpunit/php-text-template/:/path/to/docs/vendor/phpunit/phpunit/vendor/phpunit/php-token-stream/:/path/to/docs/vendor/phpunit/phpunit/vendor/phpunit/php-file-iterator/:/path/to/docs/vendor/phpunit/phpunit/vendor/phpunit/php-code-coverage/:/path/to/docs/vendor/phpunit/phpunit/vendor/phpunit/php-timer/:/path/to/docs/vendor/phpunit/phpunit/vendor/phpunit/phpunit-mock-objects/:.:/usr/local/php54/lib/php') in <b>/path/to/docs/vendor/phpunit/phpunit/PHPUnit/Util/Fileloader.php</b> on line <b>92</b><br />
<br />
<b>Warning</b>:  include_once(/path/to/docs/test/EviType): failed to open stream: Success in <b>/path/to/docs/vendor/phpunit/phpunit/PHPUnit/Util/Fileloader.php</b> on line <b>92</b><br />
<br />
<b>Warning</b>:  include_once(): Failed opening '/path/to/docs/test/EviType' for inclusion (include_path='/path/to/docs/vendor/phpunit/phpunit/:/path/to/docs/vendor/phpunit/phpunit/../../symfony/yaml:/path/to/docs/vendor/phpunit/phpunit/vendor/phpunit/php-text-template/:/path/to/docs/vendor/phpunit/phpunit/vendor/phpunit/php-token-stream/:/path/to/docs/vendor/phpunit/phpunit/vendor/phpunit/php-file-iterator/:/path/to/docs/vendor/phpunit/phpunit/vendor/phpunit/php-code-coverage/:/path/to/docs/vendor/phpunit/phpunit/vendor/phpunit/php-timer/:/path/to/docs/vendor/phpunit/phpunit/vendor/phpunit/phpunit-mock-objects/:.:/usr/local/php54/lib/php') in <b>/path/to/docs/vendor/phpunit/phpunit/PHPUnit/Util/Fileloader.php</b> on line <b>92</b><br />
PHPUnit 3.7.14 by Sebastian Bergmann.
Configuration read from /path/to/docs/test/phpunit.xml
.
Time: 0 seconds, Memory: 2.50Mb
OK (1 test, 1 assertion)

断言报告让我很高兴，但我不明白为什么它甚至试图包括目录:

include_once(/path/to/docs/test)

以及神秘的failed to open stream: Success子句的含义。这似乎是一个php的错误，但它应该在很久以前修复。

设置如下:

<php>
    <ini name="display_errors" value="0"/>
</php>

使这些警告消失，但我觉得在phpunit安装中有一个更深层的问题需要挖掘。

有什么建议吗?