First auth tests around profile

tests/CreatesApplication.php

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+<?php
+
+namespace Tests;
+
+use Illuminate\Contracts\Console\Kernel;
+
+trait CreatesApplication
+{
+    /**
+     * Creates the application.
+     *
+     * @return \Illuminate\Foundation\Application
+     */
+    public function createApplication()
+    {
+        $app = require __DIR__.'/../bootstrap/app.php';
+
+        $app->make(Kernel::class)->bootstrap();
+
+        return $app;
+    }
+}

tests/Feature/AuthenticationTest.php

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+<?php
+
+namespace Tests\Feature;
+
+use App\Models\User;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class AuthenticationTest extends TestCase
+{
+    use RefreshDatabase;
+
+    public function test_profile_routes_are_protected_from_public()
+    {
+        $response = $this->get('/profile');
+        $response->assertStatus(302);
+        $response->assertRedirect('login');
+
+        $response = $this->put('/profile');
+        $response->assertStatus(302);
+        $response->assertRedirect('login');
+
+        $user = User::factory()->create();
+        $response = $this->actingAs($user)->get('/profile');
+        $response->assertOk();
+    }
+
+    public function test_profile_link_is_invisible_in_public()
+    {
+        $response = $this->get('/');
+        $this->assertStringNotContainsString('href="/profile"', $response->getContent());
+
+        $user = User::factory()->create();
+        $response = $this->actingAs($user)->get('/');
+        $this->assertStringContainsString('href="/profile"', $response->getContent());
+    }
+}

tests/TestCase.php

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+<?php
+
+namespace Tests;
+
+use Illuminate\Foundation\Testing\TestCase as BaseTestCase;
+
+abstract class TestCase extends BaseTestCase
+{
+    use CreatesApplication;
+}