How to mock the Symfony HttpClient as a depednecy?

I have a class into which I inject an instance of Symfony\Component\HttpClient\HttpClient as a constructor parameter.

I'm looking at the documentation page at https://symfony.com/doc/current/components/http_client.html#testing-http-clients-and-responses where it is suggested to use $client = new MockHttpClient($responses); as a way to create a Mock client.

When I pass the mocked client to my class I get the error:

TypeError: Argument 3 passed to App\Allocator\Strategy\AbstractStrategy::__construct() must be an instance of Symfony\Component\HttpClient\HttpClient, instance of Symfony\Component\HttpClient\MockHttpClient received.

How do I obtain a Mock that will satisfy the typing constraint and also allow me to mock up responses?