tests/Feature/Services/UserServiceTest.php

@@ -0,0 +1,19 @@
+<?php
+
+use App\Models\User;
+use App\Services\UserService;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\App;
+
+uses(RefreshDatabase::class);
+
+beforeEach(function() {
+   $this->userService = App::make(UserService::class);
+});
+
+it('checks if a user exists', function() {
+    $realUser = User::factory()->create();
+    $fakeUser = User::factory()->make();
+    expect ($this->userService->userExists($realUser))->toBeTrue();
+    expect ($this->userService->userExists($fakeUser))->toBeFalse();
+});