Question 1

How to mock HTTP requests in Go tests using gock?

Accepted Answer

Use gock.New(url) to define mocks with chainable methods for matching and responses, then call gock.InterceptClient(client) to intercept requests. Always defer gock.Off() to clean up. The README provides examples like JSON body matching and header validation.

Question 2

gock vs httptest: which is better for Go HTTP mocking?

Accepted Answer

gock excels at intercepting any net/http client with advanced matching and runtime control, while httptest is a standard library tool better for simple server mocking. Choose gock for complex scenarios or when you need to mock external API calls without modifying client code.

Question 3

Does gock support mocking gRPC calls?

Accepted Answer

No, gock is designed only for HTTP mocking via net/http. For gRPC, you'll need other libraries like gomock or grpc-mock, as gock cannot intercept non-HTTP protocols.

Question 4

How to handle race conditions in concurrent tests with gock?

Accepted Answer

Declare mocks before starting concurrent logic and avoid reconfiguring gock during execution. The README warns that gock is not fully thread-safe, so use synchronization or isolate mock setup to prevent unexpected behavior.

Question 5

Can I use gock to intercept HTTP traffic in production for debugging?

Accepted Answer

Yes, with gock.EnableNetworking(), you can switch between mock and real modes at runtime. However, be cautious as it modifies HTTP transports globally, which might impact other parts of your application if not managed properly.

Question 6

How to restore an HTTP client after intercepting with gock?

Accepted Answer

Call gock.RestoreClient(client) after tests, typically in a defer statement along with gock.Off(). This is crucial for custom HTTP clients to avoid lingering interceptions that could affect subsequent tests or operations.

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