[BUG] test case lacks info

Author: IJOL

tests/auth_plugin_test.php

@@ -241,14 +241,15 @@ public function test_throwing_exception_if_user_is_not_exist() {
      * Test that auth plugin throws correct exception if we trying to request not existing user.
      */
     public function test_throwing_exception_if_user_is_suspended() {
-        global $USER, $SESSION;
+        global $USER;
 
         $user = $this->getDataGenerator()->create_user();
         $user->suspended = 1;
         $this->setUser($user);
         $this->assertEquals($USER->id, $user->id);
 
         $this->create_user_private_key();
+        $_POST['key'] = 'TestKey';
 
         $this->expectException(invalid_parameter_exception::class);
         $this->expectExceptionMessage('Invalid parameter value detected (User is suspended)');