Add request origin resolver test

tests/RequestOriginIdentificationTest.php

@@ -0,0 +1,43 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Stancl\Tenancy\Tests;
+
+use Illuminate\Support\Facades\Route;
+use Stancl\Tenancy\Middleware\InitializeTenancyByRequestOrigin;
+use Stancl\Tenancy\Tests\Etc\Tenant;
+
+class RequestOriginIdentificationTest extends TestCase
+{
+    public function setUp(): void
+    {
+        parent::setUp();
+
+        config([
+            'tenancy.central_domains' => [
+                'localhost',
+            ],
+        ]);
+
+        Route::middleware(InitializeTenancyByRequestOrigin::class)->get('/test', function () {
+            return 'Tenant id: ' . tenant('id');
+        });
+    }
+
+    /** @test */
+    public function origin_identification_works()
+    {
+        $tenant = Tenant::create();
+	    $tenant->domains()->create([
+		    'domain' => 'localhost'
+	    ]);
+
+        $this
+            ->withoutExceptionHandling()
+            ->get('test', [
+                'Origin' => 'http://localhost',
+            ])
+            ->assertSee($tenant->id);
+    }
+}