counterfeiter
A Go tool for generating type-safe fake implementations of interfaces to simplify unit testing.
What is counterfeiter?
Counterfeiter is a Go tool that automatically generates fake implementations of interfaces for use in unit testing. It solves the problem of manually writing test doubles by creating type-safe, self-contained fakes that record method calls and allow stubbing of return values. This makes it easier to test objects that depend on other interfaces without writing tedious boilerplate code.
Go developers writing unit tests for applications with complex dependencies, particularly those who need to mock or stub interfaces in their test suites. It's especially useful for teams practicing test-driven development or maintaining large codebases with many interfaces.
Developers choose Counterfeiter because it generates reliable, type-safe fakes automatically, reducing manual effort and potential errors. Unlike runtime mocking approaches, it produces compile-time safe code that integrates seamlessly with Go's toolchain and follows Go conventions.
Overview
A tool for generating self-contained, type-safe test doubles in go
Use Cases
Best For
- Generating fakes for interfaces with many methods to avoid manual implementation
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