Problem 1
- topthink/think-testing v2.0 requires topthink/framework 5.1.x-dev -> found topthink/framework[5.1.x-dev] but it does not match your minimum-stabilit
- topthink/think-testing[v2.0.1, ..., v2.0.5] require topthink/framework 5.1.* -> found topthink/framework[v5.1.0, ..., v5.1.41] but it conflicts withequire (5.0.24).
- Root composer.json requires topthink/think-testing ^2.0 -> satisfiable by topthink/think-testing[v2.0, ..., v2.0.5].
Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.
分析：安装topthink/think-testing v2.0版本（当时最新版本） 要求topthink/framework 5.1.*
我composer.json 限制是topthink/framework 5.0.24
总结:最新版本的topthink/think-testing v2.0 composer.json 跟本地的老版本冲突，
解决：安装对应版本的topthink/think-testing(composer.json 标识 了老版本号)
composer requrie topthink/think-testing 1.0
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