Symfony Phpunit keeps using actual class instead of mock

Question

I'm using Symfony 6.4.4, php 8.2.5
My class depends on other class, that sends http requests to microservice. For testing purposes I want to mock this class.

Code structure:

interface GatewayServiceInterface
{
    public function sendRequest(): int;
}

class GatewayService implements GatewayServiceInterface
{
    public function sendRequest(): int;
}


final readonly class TestedClass
{
    public function __construct(
      private GatewayServiceInterface $gatewayService,
      private SomeClassA $someClassA,
      private SomeClassB $someClassB
    ) {}
}

So now I want to test TestedClass. And I want it to use mock of GatewayServiceInterface.
Here is what I do

final class TestedClassTest extends WebTestCase

public function setUp(): void
{
    parent::setUp();

    $gatewayServiceMock = $this->createMock(GatewayServiceInterface::class);
    $gatewayServiceMock->method->('sendRequest')->willReturn(200);

    $testedClassWithMock = new TestedClass(
      $gatewayServiceMock,
      $this->container->get(SomeClassA::class),
      $this->container->get(SomeClassB::class)
    )

    $this->container->set(
      TestedClass::class,
      $testedClassWithMock
    );

/** Run some tests with TestedClass */
}

But when I run tests it still uses regular GatewayServiceInterface instead of MockObject.
Based on what I read on this site and symfony docs my code should work. What can I do wrong here?

Answer 1

Solution is here How to mock Symfony 2 service in a functional test?.

My mistake was that I was using Kernel's container instead of Client's container