无法使用composer安装phpunit

Question

基本上我有这个composer.json文件：

{
    "name": "phpunit/phpunit",
    "require": {
        "phpunit/phpunit": "3.8.*@dev"
    },
    "authors": [
        {
            "name": "Sebastian Bergmann",
            "email": "[e-mail]"
        }
    ]
}

当我运行"composer install"时，我会得到以下错误：

Loading composer repositories with package information
Installing dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.
  Problem 1
    - Installation request for phpunit/phpunit 3.8.*@dev -> satisfiable by phpunit/phpunit[3.8.x-dev].
    - phpunit/phpunit 3.8.x-dev requires phpunit/php-code-coverage 1.3.*@dev -> no matching package found.
Potential causes:
 - A typo in the package name
 - The package is not available in a stable-enough version according to your minimum-stability setting
   see <https://groups.google.com/d/topic/composer-dev/_g3ASeIFlrc/discussion> for more details.
Read <http://getcomposer.org/doc/articles/troubleshooting.md> for further common problems.

我不知道这意味着什么？感谢

Answer 1

在实际回答您的问题之前：

您已将项目称为phpunit/phpunit，并且对phpunit/phpunit有需求。这是一个循环依赖。你应该把你的项目称为其他东西。

此外，我怀疑你是"Sebastian Bergmann"，所以你应该更改作曲家文件中的作者姓名和电子邮件地址。

好的，对于您的实际问题，Composer默认情况下不会安装开发包。你需要明确地告诉它通过放置来安装开发包

"最低稳定性"："dev"

在项目的根composer.json文件中，或者更改PHPUnit不使用开发包的要求，例如

"require": {
    "phpunit/phpunit": "3.8.*"
},

除非您正在积极调试另一个包中的问题，否则您不太可能真正想要使用该包的开发版本。你几乎总是想要一个真正的标记版本。