How to mock a function dependencies

@sinnbeck

public function is_authentication_working()
    {
        // client mock
        $mock = $this->getMockBuilder(FusionAuthClient::class)
        ->setConstructorArgs([$this->config['apiKey'], $this->config['baseUrl']])
        ->getMock();
         
        $mock->expects($this->once())
            ->method('login')
            ->with(null, [
                'applicationId' => $this->config['appId'],
                'loginId' => '[email protected]',
                'password' => 'password',
                "ipAddress" => "1.1.1.1"
            ])
            ->willReturn((object) ['status' => 200]);
        

        $faLaravel = new Auth($mock, User::class);

        //register the user first...
        $faLaravel->register(email: '[email protected]', password: 'password');

        // then login...
        $auth = (object) $faLaravel->login(email: '[email protected]', password: 'password', ipAddress: "1.1.1.1");
        $this->assertEquals(200, $auth->status);
    }

it does have it but not directly. If you can see the code above, the method login returns an object that has the method wasSuccessful. I guess this is the source of the issue but the question is, How do I get around this error? do I have to mock the object that login() returns ?

public function login(string $email, string $password, string $ipAddress): array
    {
        $login = $this->client->login(null, [
            'applicationId' => config("fusionauth.appid", "..."),
            'ipAddress' => $ipAddress,
            'loginId' => $email,
            'password' => $password
        ]);
        
        if(!$login->wasSuccessful()) {
            return ['result' => $login->errorResponse, 'success' => false, 'status' => $login->status];
        }
        return ['result' => $login->successResponse, 'success' => true, 'status' => $login->status];
    }