Target is not instantiable. Laravel 5 - App binding service provider

If you also run in below error :

BindingResolutionException in Container.php line 749: Target [App\Contracts\TestContract] is not instantiable.

Clear your config cache with :

php artisan config:clear

I noticed the compiled.php was not being updated.

Run this function in cmd line on the root folder of your project:

php artisan clear-compiled