Laravel testing Stops Doing anything without Error

I'm testing my Laravel app . It was working good until suddenly it stopped from progressing . It doesn't exit . I doesn't produce any errors or logging . I have decreased the number of tests but no luck. I have about 100 unit tests.

Output :

vagrant@homestead:~/Code/project$ phpunit
PHPUnit 5.7.19 by Sebastian Bergmann and contributors.

............| //cursor

What is the problem ?