在Composer上安装Codeception到Yii2

Question

I have problem with installation Codeception to my Yii2 project.

1) Downloaded composer to the Yii2 project:

curl -sS https://getcomposer.org/installer | php

2) Trying install Codeception:

php composer.phar require "codeception/codeception:*"

Error:

Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - yiisoft/yii2 2.0.2 requires bower-asset/jquery 2.1.*@stable | 1.11.*@stable -> no matching package found.
    - yiisoft/yii2 2.0.2 requires bower-asset/jquery 2.1.*@stable | 1.11.*@stable -> no matching package found.
    - Installation request for yiisoft/yii2 == 2.0.2.0 -> satisfiable by yiisoft/yii2[2.0.2].

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.

Installation failed, reverting ./composer.json to its original content.

Have I missed something?

Answer 1

From http://yiiframework.com/forum/index.php/topic/61520-using-jquery-111

Try deleting [the vendor folder] first. fxp plugin caches packages info in order to be faster so it's not possible to downgrade w/o deleting vendor