Question 1

How do I use moq with go generate to create mocks?

Accepted Answer

Add a //go:generate directive in your Go file, such as //go:generate moq -out my_mock.go . MyInterface, then run go generate in the package directory. This automates mock generation as shown in the README's code integration example.

Question 2

What's the difference between moq and gomock for Go testing?

Accepted Answer

Moq is a code generation tool that creates static mock structs integrated with go generate, focusing on simplicity. Gomock uses a more dynamic approach with a controller and offers features like argument matchers, making it better for complex mocking needs but with a steeper learning curve.

Question 3

How can I reset call history in moq mocks during tests?

Accepted Answer

Call the .ResetCalls() method on the mock struct to clear all recorded invocations. This is useful for test isolation and is mentioned in the tips section, especially when using the -with-resets flag during generation.

Question 4

Does moq work with private or unexported interfaces in Go?

Accepted Answer

Moq can generate mocks for any interface in the source directory, but if the interface is unexported, the mock may have limited usability outside the package. It's generally recommended to mock exported interfaces for broader test coverage.

Question 5

What happens if I don't define a function for a mocked method in moq?

Accepted Answer

By default, calling an undefined method causes a panic. To avoid this, use the -stub flag during generation to return zero values instead, as specified in the usage options for safer default behavior.

Question 6

How to install moq for older Go versions below 1.18?

Accepted Answer

For Go versions prior to 1.18, download pre-built binaries from the Moq releases page on GitHub, since installing from source requires Go 1.18+. This is noted in the installing section of the README.

Question 7

Can moq handle import cycles when generating mocks?

Accepted Answer

Yes, use the -skip-ensure flag to suppress mock implementation checks and avoid import cycles, especially if mocks are generated outside the tested package, as explained in the command-line flags.

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