How Can I Effectively Mock the http.Client Do Method for Testing?

Mocking the http.Client Do Method

In your code, you're attempting to mock the http.Client Do method for testing purposes. Since the HttpClient interface you defined only requires a function matching the signature of Do, you can utilize a mock object to fulfill this requirement.

Consider creating a ClientMock struct:

type ClientMock struct {}

Implement the Do method in this mock struct as follows:

func (c *ClientMock) Do(req *http.Request) (*http.Response, error) {
    return &http.Response{}, nil
}

This ClientMock effectively simulates the HttpClient behavior by returning a dummy http.Response and no error.

To use this mock object, inject an instance of ClientMock into your GetOverview function as the client parameter. This allows you to control the HTTP response returned by the mock object, enabling you to simulate different scenarios during testing.

One alternative approach is to utilize a mocking library. However, as you mentioned, many libraries do not provide mocks for the Do method explicitly. You may consider wrapping the http.Client within a custom type and providing a mock for that type instead.

Ultimately, your choice of mocking strategy depends on your specific testing requirements and preferences.

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