榆树中的模拟依赖

Question

In every elm file, dependencies to be imported are declared at the top. Is there a way, while testing the application, to mock a dependency?

For example, suppose I have an application using the HTTP module to make an ajax request. When I test my module, I would like to avoid to make the actual ajax request, but I'd like to have a mocked HTTP module which will return a fake response just for the sake of testing.

How could I do this?

Answer 1

You should separate the code that calls into the Http module from the real logic you want to test.

For example, if you write a function that takes a Result Error String as an argument (such as might come back from a call to Http.getString) you can easily unit test that function without needing to make a real HTTP call.