AssertStatusToAssertMethodRector

Replace (new \Illuminate\Testing\TestResponse)->assertStatus(200) with (new \Illuminate\Testing\TestResponse)->assertOk()

 class ExampleTest extends \Illuminate\Foundation\Testing\TestCase
 {
     public function testFoo()
     {
-        $this->get('/')->assertStatus(200);
-        $this->get('/')->assertStatus(204);
-        $this->get('/')->assertStatus(401);
-        $this->get('/')->assertStatus(403);
-        $this->get('/')->assertStatus(404);
-        $this->get('/')->assertStatus(405);
-        $this->get('/')->assertStatus(422);
-        $this->get('/')->assertStatus(410);
-        $this->get('/')->assertStatus(500);
-        $this->get('/')->assertStatus(503);
+        $this->get('/')->assertOk();
+        $this->get('/')->assertNoContent();
+        $this->get('/')->assertUnauthorized();
+        $this->get('/')->assertForbidden();
+        $this->get('/')->assertNotFound();
+        $this->get('/')->assertMethodNotAllowed();
+        $this->get('/')->assertUnprocessable();
+        $this->get('/')->assertGone();
+        $this->get('/')->assertInternalServerError();
+        $this->get('/')->assertServiceUnavailable();
     }
 }

Configure your rector.php:

<?php

use RectorLaravel\Rector\MethodCall\AssertStatusToAssertMethodRector;
use Rector\Config\RectorConfig;

return RectorConfig::configure()
    ->withRules([
        AssertStatusToAssertMethodRector::class,
    ]);