$ composer require --dev phpunit/phpunit
Using version ^7.2 for phpunit/phpunit
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.
Problem 1
- Conclusion: don't install phpunit/phpunit 7.2.7
- Conclusion: don't install phpunit/phpunit 7.2.6
- Conclusion: don't install phpunit/phpunit 7.2.5
- Conclusion: don't install phpunit/phpunit 7.2.4
- Conclusion: don't install phpunit/phpunit 7.2.3
- Conclusion: don't install phpunit/phpunit 7.2.2
- Conclusion: don't install phpunit/phpunit 7.2.1
- phpunit/phpunit 7.2.0 conflicts with phpunit/phpunit-mock-objects[5.0.6].
- phpunit/phpunit 7.2.0 conflicts with phpunit/phpunit-mock-objects[5.0.6].
- phpunit/phpunit 7.2.0 conflicts with phpunit/phpunit-mock-objects[5.0.6].
- Installation request for phpunit/phpunit ^7.2 -> satisfiable by phpunit/phpunit[7.2.0, 7.2.1, 7.2.2, 7.2.3, 7.2.4, 7.2.5, 7.2.6, 7.2.7].
- Installation request for phpunit/phpunit-mock-objects (locked at 5.0.6) -> satisfiable by phpunit/phpunit-mock-objects[5.0.6].
Installation failed, reverting ./composer.json to its original content.
查看了 composer.json, 这时我才意识到原来项目中已经安装了 phpunit 6.0, 而我运行的命令会安装最新版的 phpunit 7.2.
卸载重装 phpunit 即可
$ composer remove phpunit/phpunit --dev
$ composer require phpunit/phpunit --dev
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