#1 - project skeleton

tests/CreatesApplication.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Tests;
+
+use Illuminate\Contracts\Console\Kernel;
+use Illuminate\Foundation\Application;
+
+trait CreatesApplication
+{
+    public function createApplication(): Application
+    {
+        $app = require __DIR__ . "/../bootstrap/app.php";
+
+        $app->make(Kernel::class)->bootstrap();
+
+        return $app;
+    }
+}

tests/Feature/ExampleTest.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Feature;
+
+use Tests\TestCase;
+
+class ExampleTest extends TestCase
+{
+    public function testExample(): void
+    {
+        $response = $this->get("/");
+
+        $response->assertStatus(200);
+    }
+}

tests/TestCase.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Tests;
+
+use Illuminate\Foundation\Testing\TestCase as BaseTestCase;
+
+abstract class TestCase extends BaseTestCase
+{
+    use CreatesApplication;
+}

tests/Unit/ExampleTest.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Unit;
+
+use PHPUnit\Framework\TestCase;
+
+class ExampleTest extends TestCase
+{
+    public function testExample(): void
+    {
+        $this->assertTrue(true);
+    }
+}