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Mocking and Dependency Injection in Elixir Tests
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=== Using Mocks in Tests === Once we have our mock implementation ready, we can use it in our tests. Using the same example, let's simulate a scenario where a user is successfully registered: ```elixir defmodule UserServiceTest do use ExUnit.Case, async: true import Mox defmodule MockEmailService do def send_email(email, _), do: assert email == "test@example.com" end test "registers a user" do {:ok, _} = Mox.start_link(MockEmailService) Mox.stub(MockEmailService, :send_email, fn _, _ -> :ok end) assert UserService.register_user("test@example.com") assert Mox.verify(MockEmailService, :send_email, 1) assert_received :ok end end ``` In the example above, we start the Mox server with our mock implementation `MockEmailService`. We then stub the `send_email` function to always return `:ok`. Finally, we invoke the `UserService.register_user` function and assert that the email was sent and received successfully.
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