add guard config option + fix tests

Commands/DeleteOldUnconfirmedSubscribersCommandTest.php

@@ -17,7 +17,7 @@ public function setUp(): void
     {
         parent::setUp();
 
-        TestTime::freeze();
+        TestTime::freeze('Y-m-d H:i:s', '2019-01-01 00:00:00');
 
         $this->emailList = factory(EmailList::class)->create(['requires_confirmation' => true]);
     }

Http/Middleware/AuthenticateTest.php

@@ -0,0 +1,52 @@
+<?php
+
+namespace Spatie\Mailcoach\Tests\Http\Middleware;
+
+use Illuminate\Support\Facades\Route;
+use Spatie\Mailcoach\Tests\TestCase;
+
+class AuthenticateTest extends TestCase
+{
+    public function setUp(): void
+    {
+        parent::setUp();
+
+        Route::get('login')->name('login');
+
+        $this->withExceptionHandling();
+    }
+
+    /** @test */
+    public function it_can_use_the_default_guard()
+    {
+        $this->get(route('mailcoach.campaigns'))->assertRedirect(route('login'));
+    }
+
+    /** @test */
+    public function the_default_behaviour_works()
+    {
+        $this->authenticate();
+
+        $this->get(route('mailcoach.campaigns'))->assertSuccessful();
+    }
+
+    /** @test */
+    public function it_will_fail_when_authentication_with_a_wrong_guard()
+    {
+        config()->set('mailcoach.guard', 'api');
+
+        $this->authenticate('web');
+
+        $this->get(route('mailcoach.campaigns'))->assertRedirect(route('login'));
+    }
+
+    /** @test */
+    public function it_can_authenticate_using_the_guard_specified_in_the_config_file()
+    {
+        config()->set('mailcoach.guard', 'api');
+
+        $this->authenticate('api');
+
+        $this->get(route('mailcoach.campaigns'))->assertSuccessful();
+    }
+}

TestCase.php

@@ -75,11 +75,11 @@ protected function simulateUnsubscribes(Collection $sends)
         });
     }
 
-    public function authenticate()
+    public function authenticate(string $guard = null)
     {
         $user = factory(User::class)->create();
 
-        $this->actingAs($user);
+        $this->actingAs($user, $guard);
     }
 
     public function assertMatchesHtmlSnapshotWithoutWhitespace(string $content)