Laravel dependency injection into custom non-controller class fails in PHPUnit -

all.

for laravel project i'm working on, i've started use dependency injection in order mock classes in tests. however, i've found if try inject custom class no explicit parent, 2 things true:

1. the dependency injection works correctly when running application
2. the injection fails when running tests in phpunit

here sample code similar i'm using:

democontroller

//  controller we're testing class democontroller extends controller {     //  injection , constructor     private $helplayer1;      public function __construct(helplayer1 $helplayer1)     {         $this->helplayer1 = $helplayer1;     }      ...      //  test function call     public function testdeps()     {         $this->helplayer1->testlayer1();     } } 

helperlayer1

//  our first helper class class helperlayer1 {     private $helplayer2;      public function __construct(helplayer2 $helplayer2)     {         $this->helplayer2 = $helplayer2;     }      ...      //  testing function     public function testlayer1()     {         //  when called via route, dumps actual object         //  when called via test, returns null         dd($this->helperlayer2);     } } 

helper1serviceprovider

class helper1serviceprovider extends serviceprovider {     public function register()     {         $this->app->bind('helperlayer1', function()         {             return new helperlayer1(app::make('helperlayer2'));         });     }      [or]      public function register()     {         $this->app->bind('helperlayer1', 'helperlayer1');     } } 

helper2serviceprovider

class helper2serviceprovider extends serviceprovider {     public function register()     {         $this->app->bind('helperlayer2', 'helperlayer2');     } } 

i'm relatively new using di, i'm not entirely sure set-up correct, i'm @ loss.

any appreciated! thank you!