Laravel 4 PHP Fatal error: Class 'Illuminate\Foundation\Testing\TestCase' not found

Question

I get the following error when I run phpunit with Laravel 4.

PHP Fatal error:  Class \'Illuminate\\Foundation\\Testing\\TestCase\' not found in 

Answer 1

Try to remove your "vendor" folder and the file named composer.lock after that run:

composer install

Pay attention to the output produced by composer.