Override the Authentication when using dingo/api, when testing the Api with PhpUnit.

ProfileApiTest.php

<?php

use App\Entities\User;

class ProfileApiTest extends TestCase
{
    /**
     * @test
     *
     * Get user profile.
     *
     * Given There there is an authenticated user.
     * When GET /profile is called.
     * Then return the user data.
     */
    public function it_returns_user_profile()
    {
        //given
        $user = factory(User::class)->create();
        $this->actingAsApi($user);

        //when
        $response = $this->call('GET', '/profile');

        // then
        $this->seeJson(['id' => $user->id])
            ->seeJson(['name' => $user->name])
            ->seeJson(['email' => $user->email]);
    }

    // TODO: test other /profile endpoints
}

TestCase.php

<?php

use App\Providers\AppServiceProvider;

class TestCase extends Laravel\Lumen\Testing\TestCase
{
    /**
     * Creates the application.
     *
     * @return \Laravel\Lumen\Application
     */
    public function createApplication()
    {
        $unitTesting = true;

        $testEnvironment = 'testing';

        return require __DIR__ . '/../bootstrap/app.php';
    }

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

        $this->baseUrl = env('API_SCHEME', 'http') . "://" . env('API_DOMAIN');
    }

    /**
     * Sets the API user.
     *
     * @param  App\Entities\User  $user
     * @return $this
     */
    protected function actingAsApi($user)
    {
        // mock service middleware
        $auth = Mockery::mock('Dingo\Api\Http\Middleware\Auth[handle]',
            [
                Mockery::mock('Dingo\Api\Routing\Router'),
                Mockery::mock('Dingo\Api\Auth\Auth'),
            ]);
        $auth->shouldReceive('handle')
            ->andReturnUsing(function ($request, \Closure $next) {
                return $next($request);
            });
        $this->app->instance('Dingo\Api\Http\Middleware\Auth', $auth);

        $auth = Mockery::mock('Dingo\Api\Auth\Auth[user]',
            [
                app('Dingo\Api\Routing\Router'),
                app('Illuminate\Container\Container'),
                [],
            ]);
        $auth->shouldReceive('user')
            ->andReturnUsing(function () use ($user) {
                return $user;
            });
        $this->app->instance('Dingo\Api\Auth\Auth', $auth);

        return $this;
    }
}