How to Get Started with GoMock Playbook
Blog post from Speedscale
GoMock is a Go testing package that generates type-safe mock implementations from interfaces, enabling developers to isolate components, simulate dependencies such as APIs, and test behavior without relying on real external services. The tutorial explains installing the `mockgen` generator and GoMock module, defining an interface-based payment processor example, generating a mock, and configuring a controller, expected method calls, return values, and invocation counts in unit tests. It also describes argument matchers, custom mock actions through `Do`, ordered-call enforcement with `After` or `InOrder`, and failure messages that help diagnose unexpected interactions. While mocks can make tests faster, more reliable, and less dependent on costly integration environments, GoMock is limited to Go, primarily supports unit testing, is tied to individual codebases, and requires interfaces when using generated mocks.
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