Webiny\Component\Security\Authentication\Firewall::processLogin PHP Method

    public function processLogin($authProvider = '')
    {
        try {
            // if we are on login page, first try to get the instance of Login object from current auth provider
            $login = $this->getAuthProvider($authProvider)->getLoginObject($this->getConfig());
            if (!$this->isInstanceOf($login, 'Webiny\\Component\\Security\\Authentication\\Providers\\Login')) {
                throw new FirewallException('Authentication provider method getLoginObject() must return an instance of
														"Webiny\\Component\\Security\\Authentication\\Providers\\Login".');
            }
            $login->setAuthProviderName($this->authProviderName);
        } catch (\Exception $e) {
            throw new FirewallException($e->getMessage());
        }
        // forward the login object to user providers and validate the credentials
        $this->user = $this->authenticate($login);
        if (!$this->user) {
            // login failed
            $this->getAuthProvider($authProvider)->invalidLoginProvidedCallback();
            $this->eventManager()->fire(SecurityEvent::LOGIN_INVALID, new SecurityEvent(new AnonymousUser()));
            return false;
        } else {
            $this->getAuthProvider($authProvider)->loginSuccessfulCallback($this->user);
            $this->eventManager()->fire(SecurityEvent::LOGIN_VALID, new SecurityEvent($this->user));
            $this->setUserRoles();
            $this->userAuthenticated = true;
            return true;
        }
    }

 /**
  * @param Firewall $firewall
  *
  * @dataProvider firewallProvider
  */
 public function testIsUserDeniedAccessOnAddressThatIsInsideAccessRules($firewall)
 {
     $firewall->processLogin('MockProvider');
     // let's authenticate the user
     Request::getInstance()->setCurrentUrl('http://admin.w3.com/about/');
     $result = $firewall->isUserAllowedAccess();
     $this->assertFalse($result);
 }