avoid error-suppression operator

tests/phpunit/CRM/Extension/Manager/ModuleTest.php

@@ -225,8 +225,8 @@ class CRM_Extension_Manager_ModuleTest extends CiviUnitTestCase {
   public function assertHookCounts($module, $counts) {
     global $_test_extension_manager_moduletest_counts;
     foreach ($counts as $key => $expected) {
-      $actual = @$_test_extension_manager_moduletest_counts[$module][$key];
-      $this->assertEquals($expected, $actual,
+      $actual = $_test_extension_manager_moduletest_counts[$module][$key] ?? 0;
+      $this->assertSame($expected, $actual,
         sprintf('Expected %d call(s) to hook_civicrm_%s -- found %d', $expected, $key, $actual)
       );
     }