为什么代码覆盖率报告在php 7.2上失败？

Question

我在php 7.0和7.2上运行一个关于travis-ci的php构建矩阵。

https://travis-ci.org/uawcob/course-overrides/jobs/242630482

在7.0，测试全部通过，并生成代码覆盖率的罚款。

在7.2，你可以看到，所有的测试运行，并通过相同的，但生成的代码覆盖率报告抛出这导致整个构建以失败异常。

这是为什么？为后人

完整的错误堆栈：

Generating code coverage report in HTML format ...PHP Fatal error: Uncaught Illuminate\Contracts\Container\BindingResolutionException: Target [Illuminate\Contracts\Debug\ExceptionHandler] is not instantiable. in /home/travis/build/uawcob/course-overrides/vendor/laravel/framework/src/Illuminate/Container/Container.php:895 
Stack trace: 
#0 /home/travis/build/uawcob/course-overrides/vendor/laravel/framework/src/Illuminate/Container/Container.php(735): Illuminate\Container\Container->notInstantiable('Illuminate\\Cont...') 
#1 /home/travis/build/uawcob/course-overrides/vendor/laravel/framework/src/Illuminate/Container/Container.php(608): Illuminate\Container\Container->build('Illuminate\\Cont...') 
#2 /home/travis/build/uawcob/course-overrides/vendor/laravel/framework/src/Illuminate/Container/Container.php(575): Illuminate\Container\Container->resolve('Illuminate\\Cont...') 
#3 /home/travis/build/uawcob/course-overrides/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(728): Illuminate\Container\Container->make('Illuminate\\Cont...') 
#4 /home/travis/build/uawcob/cour in /home/travis/build/uawcob/course-overrides/vendor/laravel/framework/src/Illuminate/Container/Container.php on line 895 
Fatal error: Uncaught Illuminate\Contracts\Container\BindingResolutionException: Target [Illuminate\Contracts\Debug\ExceptionHandler] is not instantiable. in /home/travis/build/uawcob/course-overrides/vendor/laravel/framework/src/Illuminate/Container/Container.php on line 895 
Illuminate\Contracts\Container\BindingResolutionException: Target [Illuminate\Contracts\Debug\ExceptionHandler] is not instantiable. in /home/travis/build/uawcob/course-overrides/vendor/laravel/framework/src/Illuminate/Container/Container.php on line 895 
Call Stack: 
    3.7921 6622616 1. Illuminate\Foundation\Bootstrap\HandleExceptions->handleException() /home/travis/build/uawcob/course-overrides/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php:0 
    3.7921 6622616 2. Illuminate\Foundation\Bootstrap\HandleExceptions->getExceptionHandler() /home/travis/build/uawcob/course-overrides/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php:80 
    3.7921 6622616 3. Illuminate\Foundation\Application->make() /home/travis/build/uawcob/course-overrides/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php:155 
    3.7921 6622616 4. Illuminate\Foundation\Application->make() /home/travis/build/uawcob/course-overrides/vendor/laravel/framework/src/Illuminate/Foundation/Application.php:728 
    3.7921 6622616 5. Illuminate\Foundation\Application->resolve() /home/travis/build/uawcob/course-overrides/vendor/laravel/framework/src/Illuminate/Container/Container.php:575 
    3.7921 6622616 6. Illuminate\Foundation\Application->build() /home/travis/build/uawcob/course-overrides/vendor/laravel/framework/src/Illuminate/Container/Container.php:608 
    3.7921 6622728 7. Illuminate\Foundation\Application->notInstantiable() /home/travis/build/uawcob/course-overrides/vendor/laravel/framework/src/Illuminate/Container/Container.php:735 
PHP Fatal error: Uncaught Illuminate\Contracts\Container\BindingResolutionException: Target [Illuminate\Contracts\Debug\ExceptionHandler] is not instantiable. in /home/travis/build/uawcob/course-overrides/vendor/laravel/framework/src/Illuminate/Container/Container.php:895 
Stack trace: 
#0 /home/travis/build/uawcob/course-overrides/vendor/laravel/framework/src/Illuminate/Container/Container.php(735): Illuminate\Container\Container->notInstantiable('Illuminate\\Cont...') 
#1 /home/travis/build/uawcob/course-overrides/vendor/laravel/framework/src/Illuminate/Container/Container.php(608): Illuminate\Container\Container->build('Illuminate\\Cont...') 
#2 /home/travis/build/uawcob/course-overrides/vendor/laravel/framework/src/Illuminate/Container/Container.php(575): Illuminate\Container\Container->resolve('Illuminate\\Cont...') 
#3 /home/travis/build/uawcob/course-overrides/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(728): Illuminate\Container\Container->make('Illuminate\\Cont...') 
#4 /home/travis/build/uawcob/cour in /home/travis/build/uawcob/course-overrides/vendor/laravel/framework/src/Illuminate/Container/Container.php on line 895 
Fatal error: Uncaught Illuminate\Contracts\Container\BindingResolutionException: Target [Illuminate\Contracts\Debug\ExceptionHandler] is not instantiable. in /home/travis/build/uawcob/course-overrides/vendor/laravel/framework/src/Illuminate/Container/Container.php on line 895 
Illuminate\Contracts\Container\BindingResolutionException: Target [Illuminate\Contracts\Debug\ExceptionHandler] is not instantiable. in /home/travis/build/uawcob/course-overrides/vendor/laravel/framework/src/Illuminate/Container/Container.php on line 895 
Call Stack: 
    3.7929 6633672 1. Illuminate\Foundation\Bootstrap\HandleExceptions->handleShutdown() /home/travis/build/uawcob/course-overrides/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php:0 
    3.7938 6641592 2. Illuminate\Foundation\Bootstrap\HandleExceptions->handleException() /home/travis/build/uawcob/course-overrides/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php:119 
    3.7938 6641592 3. Illuminate\Foundation\Bootstrap\HandleExceptions->getExceptionHandler() /home/travis/build/uawcob/course-overrides/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php:80 
    3.7938 6641592 4. Illuminate\Foundation\Application->make() /home/travis/build/uawcob/course-overrides/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php:155 
    3.7938 6641592 5. Illuminate\Foundation\Application->make() /home/travis/build/uawcob/course-overrides/vendor/laravel/framework/src/Illuminate/Foundation/Application.php:728 
    3.7938 6641592 6. Illuminate\Foundation\Application->resolve() /home/travis/build/uawcob/course-overrides/vendor/laravel/framework/src/Illuminate/Container/Container.php:575 
    3.7939 6641592 7. Illuminate\Foundation\Application->build() /home/travis/build/uawcob/course-overrides/vendor/laravel/framework/src/Illuminate/Container/Container.php:608 
    3.7939 6641704 8. Illuminate\Foundation\Application->notInstantiable() /home/travis/build/uawcob/course-overrides/vendor/laravel/framework/src/Illuminate/Container/Container.php:735 

Answer 1

寻找到你对于确切的错误信息代码，the proposed fix upstream是排除从代码覆盖的./app/Http/routes.php文件：

... 
<whitelist processUncoveredFilesFromWhitelist="true"> 
    <directory suffix=".php">./app</directory> 
     <exclude> 
      <file>./app/Http/routes.php</file> 

      <!--^^^^^^^^^^^^^--> 

... 

这是从一个快速检查你的项目的构建源失败，显示这还没有设置在phpunit.xml.dist文件。我不能说为什么只发生在PHP 7.2版本中。所以，这可以摆脱更多的光线，也许这响起了一个钟声（例如不同的Phpunit版本）。