Call to undefined method doRun()

Preconditions

1. Bundle version 4.0
2. PHP Unit version 7.5.20
3. Symfony version 5.0.5
4. PHP version 7.3.13
5. My .env.test looks like this:

DATABASE_URL=sqlite:///%kernel.project_dir%/var/data/test.sqlite

and the test.sqlite database has been created and has the correct schema.

Steps to reproduce

After installing the bundle and running ./bin/phpunit, I get this error:

HP Fatal error: Uncaught Error: Call to undefined method PHPUnit\TextUI\TestRunner::doRun() in /app/bin/.phpunit/phpunit-7.5-0/src/TextUI/Command.php:206
Stack trace:
#0 /app/bin/.phpunit/phpunit-7.5-0/src/TextUI/Command.php(162): PHPUnit\TextUI\Command->run(Array, true)
#1 /app/bin/.phpunit/phpunit-7.5-0/phpunit(17): PHPUnit\TextUI\Command::main()
#2 /app/vendor/symfony/phpunit-bridge/bin/simple-phpunit.php(343): include('/app/bin/.phpun...')
#3 /app/bin/phpunit(13): require('/app/vendor/sym...')
#4 {main}
thrown in /app/bin/.phpunit/phpunit-7.5-0/src/TextUI/Command.php on line 206

EDIT:

It works if you run ./vendor/bin/phpunit. So apparently it doesn't work with the bridge version.

Start by reproducing the failure with ./bin/phpunit and compare it with ./vendor/bin/phpunit, as the issue reports different behavior. Read bin/phpunit, vendor/symfony/phpunit-bridge/bin/simple-phpunit.php, and the referenced PHPUnit TextUI/Command.php path. Done means the bridge command runs the test suite without the undefined doRun() error.