Controller

    public function __construct(Company $company, User $user)
    {
        $this->company = $company;
        $this->user = $user;
    }

    /**
     * Display a listing of the resource.
     *
     * @return Response
     */
    public function index($companyId)
    {
        $company = $this->company->find($companyId);
        $users = $company->users()->get();

        return View::make('company.users.index', compact('users', 'companyId'));
    }

UnitTest

    public function setUp()
    {
        parent::setUp();

        //mock company
        $modelClass = 'Models\Company';
        $this->mock = m::mock('Eloquent', $modelClass)->shouldDeferMissing();
        $this->app->instance($modelClass, $this->mock);

        //mock user
        $userClass = 'Models\User';
        $this->user = m::mock('Eloquent', $userClass)->shouldDeferMissing();
        $this->app->instance($userClass, $this->user);

        $this->collection = m::mock('Illuminate\Database\Eloquent\Collection')->shouldDeferMissing();
        $this->app->instance('Illuminate\Database\Eloquent\Collection', $this->collection);

        $this->attributes = Factory::make($modelClass, ['id' => 1]);

        //create a voice broadcast
        $this->call('GET', 'company/create');
    }

    public function tearDown()
    {
        m::close();
    }

    public function testIndex()
    {
        $this->company->shouldReceive('find')->once()->andReturn($this->collection);
        $this->company->shouldReceive('users')->once()->andReturn($this->collection);
        $this->call('GET', '1/users');

        $this->assertViewHas('users');
    }