Fatal Errors with PHPUnit Test Suite: Laravel 10, PHPUnit 10, ParaTest 7

Posted on by Andrew Minion

TL;DR: PHPUnit 10.5.32 is broken, 10.5.31 works.

After a composer update one one of my projects today, I started getting this error when running my test suite: Fatal error: Uncaught Illuminate\Contracts\Container\BindingResolutionException: Target [Illuminate\Contracts\Debug\ExceptionHandler] is not instantiable.

All the tests passed just fine…no errors or warnings. At the end of the test execution output, it displayed this stacktrace:

> php artisan test --parallel --stop-on-failure --stop-on-error
ParaTest v7.4.5 upon PHPUnit 10.5.32 by Sebastian Bergmann and contributors.

Processes:     10
Runtime:       PHP 8.3.10
Configuration: /Users/andrewminion/Sites/site-domain/phpunit.xml

.......................................................SS....   61 / 1014 (  6%)
.............................................................  122 / 1014 ( 12%)
.............................................................  183 / 1014 ( 18%)
.............................................................  244 / 1014 ( 24%)
.............................................................  305 / 1014 ( 30%)
.............................................................  366 / 1014 ( 36%)
..................................S...I......................  427 / 1014 ( 42%)
.............................................................  488 / 1014 ( 48%)
.............................................................  549 / 1014 ( 54%)
.............................................................  610 / 1014 ( 60%)
.............................................................  671 / 1014 ( 66%)
.............................................................  732 / 1014 ( 72%)
.............................................................  793 / 1014 ( 78%)
.............................................................  854 / 1014 ( 84%)
.............................................................  915 / 1014 ( 90%)
.........................I...................................  976 / 1014 ( 96%)
......................................                        1014 / 1014 (100%)

Time: 02:04.815, Memory: 70.50 MB

OK, but there were issues!
Tests: 1014, Assertions: 6462, Skipped: 3, Incomplete: 2.

Fatal error: Uncaught Illuminate\Contracts\Container\BindingResolutionException: Target [Illuminate\Contracts\Debug\ExceptionHandler] is not instantiable. in /Users/andrewminion/Sites/site-domain/vendor/laravel/framework/src/Illuminate/Container/Container.php on line 1126

Illuminate\Contracts\Container\BindingResolutionException: Target [Illuminate\Contracts\Debug\ExceptionHandler] is not instantiable. in /Users/andrewminion/Sites/site-domain/vendor/laravel/framework/src/Illuminate/Container/Container.php on line 1126

Call Stack:
  125.2423   77506896   1. Illuminate\Foundation\Bootstrap\HandleExceptions->Illuminate\Foundation\Bootstrap\{closure:/Users/andrewminion/Sites/site-domain/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php:254-256}() /Users/andrewminion/Sites/site-domain/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php:0
  125.2423   77507336   2. Illuminate\Foundation\Bootstrap\HandleExceptions->handleException() /Users/andrewminion/Sites/site-domain/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php:255
  125.2423   77470472   3. Illuminate\Foundation\Bootstrap\HandleExceptions->getExceptionHandler() /Users/andrewminion/Sites/site-domain/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php:183
  125.2423   77470472   4. Illuminate\Foundation\Application->make() /Users/andrewminion/Sites/site-domain/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php:288
  125.2423   77470472   5. Illuminate\Foundation\Application->make() /Users/andrewminion/Sites/site-domain/vendor/laravel/framework/src/Illuminate/Foundation/Application.php:946
  125.2423   77470472   6. Illuminate\Foundation\Application->resolve() /Users/andrewminion/Sites/site-domain/vendor/laravel/framework/src/Illuminate/Container/Container.php:731
  125.2423   77470472   7. Illuminate\Foundation\Application->resolve() /Users/andrewminion/Sites/site-domain/vendor/laravel/framework/src/Illuminate/Foundation/Application.php:961
  125.2423   77470528   8. Illuminate\Foundation\Application->build() /Users/andrewminion/Sites/site-domain/vendor/laravel/framework/src/Illuminate/Container/Container.php:795
  125.2423   77470624   9. Illuminate\Foundation\Application->notInstantiable() /Users/andrewminion/Sites/site-domain/vendor/laravel/framework/src/Illuminate/Container/Container.php:921


Fatal error: Uncaught Illuminate\Contracts\Container\BindingResolutionException: Target [Illuminate\Contracts\Debug\ExceptionHandler] is not instantiable. in /Users/andrewminion/Sites/site-domain/vendor/laravel/framework/src/Illuminate/Container/Container.php on line 1126

Illuminate\Contracts\Container\BindingResolutionException: Target [Illuminate\Contracts\Debug\ExceptionHandler] is not instantiable. in /Users/andrewminion/Sites/site-domain/vendor/laravel/framework/src/Illuminate/Container/Container.php on line 1126

Call Stack:
  125.2457   77507224   1. Illuminate\Foundation\Bootstrap\HandleExceptions->Illuminate\Foundation\Bootstrap\{closure:/Users/andrewminion/Sites/site-domain/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php:254-256}() /Users/andrewminion/Sites/site-domain/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php:0
  125.2457   77507448   2. Illuminate\Foundation\Bootstrap\HandleExceptions->handleShutdown() /Users/andrewminion/Sites/site-domain/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php:255
  125.2460   77519232   3. Illuminate\Foundation\Bootstrap\HandleExceptions->handleException() /Users/andrewminion/Sites/site-domain/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php:231
  125.2460   77519232   4. Illuminate\Foundation\Bootstrap\HandleExceptions->getExceptionHandler() /Users/andrewminion/Sites/site-domain/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php:183
  125.2460   77519232   5. Illuminate\Foundation\Application->make() /Users/andrewminion/Sites/site-domain/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php:288
  125.2460   77519232   6. Illuminate\Foundation\Application->make() /Users/andrewminion/Sites/site-domain/vendor/laravel/framework/src/Illuminate/Foundation/Application.php:946
  125.2460   77519232   7. Illuminate\Foundation\Application->resolve() /Users/andrewminion/Sites/site-domain/vendor/laravel/framework/src/Illuminate/Container/Container.php:731
  125.2460   77519232   8. Illuminate\Foundation\Application->resolve() /Users/andrewminion/Sites/site-domain/vendor/laravel/framework/src/Illuminate/Foundation/Application.php:961
  125.2460   77519232   9. Illuminate\Foundation\Application->build() /Users/andrewminion/Sites/site-domain/vendor/laravel/framework/src/Illuminate/Container/Container.php:795
  125.2460   77519328  10. Illuminate\Foundation\Application->notInstantiable() /Users/andrewminion/Sites/site-domain/vendor/laravel/framework/src/Illuminate/Container/Container.php:921

After some trial-and-error, I narrowed it down to PHPUnit 10.5.32. Something in the changeset from 10.5.31 to 10.5.32 caused this error.

This also happens only when running tests in parallel (php artisan test --parallel), suggesting to me that perhaps the PHPUnit output changed in some way that ParaTest was not expecting.

My fix, at least for now, is to stick with PHPUnit 10.5.31, and hopefully an imminent upgrade to Laravel 11 and PHPUnit 11 will resolve it.

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