Subscriber "PHPUnit\Event\Test\DataProviderMethodCalledSubscriber" does not exist or is not an interface

[nishant04412]

Q	A
PHPUnit version	10
PHP version	8.1
Installation Method	Composer

Summary

After upgrading from phpunit/phpunit": "^9.5" to phpunit/phpunit": "^10.0" and running command vendor/bin/phpunit getting error as below:

An error occurred inside PHPUnit.

Message:  Subscriber "PHPUnit\Event\Test\DataProviderMethodCalledSubscriber" does not exist or is not an interface
Location: /opt/homebrew/var/www/mag2ce/vendor/phpunit/phpunit/src/Event/TypeMap.php:97

#0 /opt/homebrew/var/www/mag2ce/vendor/phpunit/phpunit/src/Event/TypeMap.php(42): PHPUnit\Event\TypeMap->ensureSubscriberInterfaceExists('PHPUnit\\Event\\T...')
#1 /opt/homebrew/var/www/mag2ce/vendor/phpunit/phpunit/src/Event/Facade.php(252): PHPUnit\Event\TypeMap->addMapping('PHPUnit\\Event\\T...', 'PHPUnit\\Event\\T...')
#2 /opt/homebrew/var/www/mag2ce/vendor/phpunit/phpunit/src/Event/Facade.php(162): PHPUnit\Event\Facade->registerDefaultTypes(Object(PHPUnit\Event\TypeMap))
#3 /opt/homebrew/var/www/mag2ce/vendor/phpunit/phpunit/src/Event/Facade.php(150): PHPUnit\Event\Facade->typeMap()
#4 /opt/homebrew/var/www/mag2ce/vendor/phpunit/phpunit/src/Event/Facade.php(132): PHPUnit\Event\Facade->deferredDispatcher()
#5 /opt/homebrew/var/www/mag2ce/vendor/phpunit/phpunit/src/Event/Facade.php(45): PHPUnit\Event\Facade->createDispatchingEmitter()
#6 /opt/homebrew/var/www/mag2ce/vendor/phpunit/phpunit/src/Event/Facade.php(32): PHPUnit\Event\Facade->__construct()
#7 /opt/homebrew/var/www/mag2ce/vendor/phpunit/phpunit/src/Event/Facade.php(40): PHPUnit\Event\Facade::instance()
#8 /opt/homebrew/var/www/mag2ce/vendor/phpunit/phpunit/src/TextUI/Application.php(86): PHPUnit\Event\Facade::emitter()
#9 /opt/homebrew/var/www/mag2ce/vendor/phpunit/phpunit/phpunit(99): PHPUnit\TextUI\Application->run(Array)
#10 {main}

I saw multiple issues closed with same error like #5408 and #5417 but skeptical if issue is related to multiple phpunit version mixup or some newly introduced changes.

Additional Analysis

As per my current analysis, I am getting error when upgrading from phpunit 9 to 10 and my composer.json file contains autoload section as below:

"autoload": {
        "exclude-from-classmap": [
            "**/Test/**"
        ]
    },

But when I remove **/Test/** from above block, command works fine. Looks like phpunit/phpunit/src/Event/TypeMap.php is missing some of required classes when performing mapping.

Note: Adding **/Test/** is important from performance's perspective so removing it might not be best idea.

It would be great if someone can help with this or provide some more info if this is indeed related to multiple phpunit versions mixup.

[sebastianbergmann]

It appears that you have different installations of PHPUnit mixed up.

For instance, you may have used Composer to install PHPUnit and have configured the autoloader generated by Composer as PHPUnit's bootstrap script but then you invoke PHPUnit using an executable other than vendor/bin/phpunit.

[nishant04412]

@sebastianbergmann Thank you for quick reply. Yes I tried to debug based on this input but couldn't find anything.

Here is what I did:

1. I updated phpunit version in my composer.json
2. I ran composer update command which got successfully executed (It would have caused error if there was any dependency related issue)
3. I ran vendor/bin/phpunit command and got the error.

Also, please check my Additional Analysis of the issue and if it has anything to do with the issue.

[sebastianbergmann]

Thank you for your report.

Please provide a minimal, self-contained, reproducing test case that shows the problem you are reporting.

Without such a minimal, self-contained, reproducing test case I will not be able to investigate this issue.

[nishant04412]

Steps to reproduce:

1. Create composer.json file as below:

{
  "name": "test/new",
  "require": {
    "php": "~8.1.0||~8.2.0"
  },
  "require-dev": {
    "phpunit/phpunit": "^10.0"
  },
  "autoload": {
    "exclude-from-classmap": [
      "**/Test/**"
    ]
  },
  "prefer-stable": true
}

2. Run composer install
3. Run vendor/bin/phpunit

[sebastianbergmann]

You are configuring Composer to exclude **/Test/** from the autoloader classmap:

  "autoload": {
    "exclude-from-classmap": [
      "**/Test/**"
    ]
  },

This prevents some of PHPUnit's classes to be found.

I do not consider this to be a bug in PHPUnit but rather an incorrect usage of Composer.