Ensure each autoloader can register and unregister

Author: mattwellss

tests/bitExpert/PHPStan/Magento/Autoload/RegistrationUnitTest.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace bitExpert\PHPStan\Magento\Autoload;
+
+use PHPStan\Cache\Cache;
+use PHPUnit\Framework\TestCase;
+
+class RegistrationUnitTest extends TestCase
+{
+    /**
+     * @test
+     * @dataProvider provideAutoloaders()
+     */
+    public function autoloadersCanRegisterAndUnregister(Autoloader $autoloader)
+    {
+        $autoloadFunctions = spl_autoload_functions();
+        $autoloader->register();
+        static::assertCount(count($autoloadFunctions) + 1, spl_autoload_functions());
+        $autoloader->unregister();
+        static::assertCount(count($autoloadFunctions), spl_autoload_functions());
+    }
+
+    public function provideAutoloaders(): array
+    {
+        $cache = new Cache($this->getMockBuilder(\PHPStan\Cache\CacheStorage::class)->getMock());
+
+        return [
+            [new FactoryAutoloader($cache)],
+            [new MockAutoloader()],
+            [new ProxyAutoloader($cache)],
+            [new TestFrameworkAutoloader()]
+        ];
+    }
+}