Question 1

How do I mock HTTP requests in Go unit tests?

Accepted Answer

Use httpmock's Activate function to intercept requests, then RegisterResponder to define mock responses with helpers like NewStringResponder. It hooks into Go's net/http transport for seamless integration.

Question 2

httpmock vs gock: which should I use?

Accepted Answer

httpmock is simpler and integrates well with Go's testing frameworks out-of-the-box, while gock offers more features like request/response recording. Choose httpmock for straightforward mocking with minimal setup.

Question 3

Can I use httpmock with Ginkgo?

Accepted Answer

Yes, httpmock works with Ginkgo—activate it in BeforeSuite and reset mocks in BeforeEach, as detailed in the README example. This ensures clean state between test cases.

Question 4

How to create JSON responses with httpmock?

Accepted Answer

Use the NewJsonResponder helper to generate JSON responses with application/json content-type, or define custom responder functions to encode Go structs, as shown in the advanced example.

Question 5

How to check how many times a mock was called?

Accepted Answer

Call GetTotalCallCount for overall calls or GetCallCountInfo for per-URL details, then use these in assertions with testing frameworks to verify HTTP interaction counts.

Question 6

httpmock or httptest: when to use which?

Accepted Answer

Use httptest for creating full HTTP test servers with custom handlers, while httpmock is better for intercepting and mocking requests to external APIs in client code without spinning up servers.

Question 7

How to mock dynamic responses based on request parameters in httpmock?

Accepted Answer

Implement a custom responder function that accesses request data via httpmock.MustGetSubmatchAsUint or body decoding, then generate responses dynamically, as demonstrated in the advanced example with regex submatch.

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