How to pass Guzzle Mock Handler to a PHP class to test an API call that has json response

Question

I have a php class that uses guzzle to call an API and get a response:

public function getResponseToken()
{
    $response = $this->myGUzzleClient->request(
        'POST',
        '/token.php,
        [
            'headers' => [
                'Content-Type' => 'application/x-www-form-urlencoded'
            ],
            'form_params' => [
                'username' => $this->params['username'],
                'password' => $this->params['password'],
            ]
        ]
    );

    return json_decode($response->getBody()->getContents())->token;
}

I am trying to test this method using guzzle mock handler, this is what I have done so far but not working:

public function testGetResponseToken()
{

    $token = 'stringtoken12345stringtoken12345stringtoken12345';
    $mockHandler = new MockHandler([
        new Response(200, ['X-Foo' => 'Bar'], $token)
        ]
    );

    $handlerStack = HandlerStack::create($mockHandler);
    $client = new Client(['handler' => $handlerStack]);


    $myService = new MyService(
            new Logger('testLogger'),
            $client,
            $this->config
        );

        $this->assertEquals($token, $myService->getResponseToken());
}

the error I am getting says "Trying to get property of non-object", so looks to me MyService is not using the handler to make the call. What am I doing wrong?

The class works as expected outside of the test context. Also note the client in normally injected in MyService from service.yml (I am using symfony).

Answer 1

Your handler work fine, you just mock the wrong response data. You should make the response as raw json.

Try

$token = 'stringtoken12345stringtoken12345stringtoken12345';
    $mockHandler = new MockHandler(
    [
    new Response(200, ['X-Foo' => 'Bar'], \json_encode([ 'token' => $token ]))
    ]
);

Now it should be works