first commit

tests/Unit/Http/Middleware/UseApiGuardTest.php

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+<?php
+
+use App\Http\Middleware\UseApiGuard;
+use Illuminate\Http\Request;
+
+test('middleware switches default guard to sanctum and sets accept header', function () {
+    $request = Request::create('/');
+
+    $response = (new UseApiGuard(app('auth')))->handle($request, fn ($req) => $req);
+
+    $this->assertSame('application/json', $response->headers->get('Accept'));
+    $this->assertSame('sanctum', auth()->getDefaultDriver());
+});