Drupal 8 PHPUnit testing Invalid Credentials - php

Question

I have a class I want to test that uses this module PHP HTTP client for Emarsys webservice, but when I try to test it, I will always get $response as "Credentials are invalid" from the module itself.
Here's a snippet of my code: (Given that I was able to correctly create my setUp() for Test Class since I was able to use it for other tests)
Test.php
Class TestClass extends UnitTestCase {
public function testCreateWithValidEmail() {
$newsletter = new Newsletter();
$form = new FormState();
$form->setValue('email', 'abc#def.ghi');
$response = $newsletter->register($form);
// Assertion here
}
}
Class.php
use Snowcap\Emarsys\CurlClient;
use Snowcap\Emarsys\Client;
Class Newsletter {
public function register(FormStateInterface $state){
$emailData = $state->getValue('email');
$httpClient = new CurlClient();
$client = new Client($httpClient, $api_username, $api_secret);
$someData = [
"3" => $emailData, // since 3 is the index ID for email
// ...more data here
];
$response = $client->createContact($someData);
}
}
Do I have to create a mock of something here to pass a dummy api and secret then force a valid response from createContact?

Answer 1

You are in the good direction. But that Newsletter class needs the $httpClient injected.
So you will be able to do:
$client = $this->getMockBuilder(Snowcap\Emarsys\CurlClient::class)
->disableOriginalConstructor()
->getMock();
$response = $this->getMockBuilder(ResponseInterface::class)
->disableOriginalConstructor()
->getMock();
$response->expects($this->any())
->method('getStatusCode')
->willReturn(Response::HTTP_OK);
$client->expects($this->any())
->method('createContact')
->with($someData)
->will($this->returnValue($response));
$newsletter = new Newsletter($client);
$response = $newsletter->register($form);
// Assertion here