counterfeiter ☆

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Description:
Tool for generating self-contained, type-safe test doubles in go

Type: Formula | Latest Version: 6.12.1@0 | Tracked Since: Dec 17, 2025

Links: Homepage | formulae.brew.sh

Category: Developer tools

Tags: testing mocking golang code-generation tdd

Install: brew install counterfeiter

About:
Counterfeiter is a code generation tool for the Go programming language that creates test doubles, also known as fakes or mocks. It generates fully self-contained, type-safe implementations of interfaces based on simple annotations. This allows developers to write reliable unit tests by easily isolating dependencies and verifying interactions.

Key Features:

Generates type-safe, self-contained fakes from Go interfaces
Simple annotation-based code generation
Supports both fakes and mocks for behavior verification
Integrates seamlessly with the standard Go testing framework

Use Cases:

Isolating external dependencies in unit tests
Verifying interactions and call sequences on interfaces
Testing complex business logic without setting up real services

Alternatives:

gomock – Part of the official Go toolchain but has been deprecated; Counterfeiter offers a simpler annotation-based approach.
testify/mock – Provides manual mock implementations; Counterfeiter automates the generation, reducing boilerplate code.

License: MIT

Dependencies: go

Bottles available for: arm64_tahoe, arm64_sequoia, arm64_sonoma, sonoma, arm64_linux, x86_64_linux

Version History

Detected	Version	Rev	Change	Commit
Sep 14, 2025 2:17am		0	VERSION_BUMP	2bb60c36
Dec 18, 2024 4:56pm		0	VERSION_BUMP	c52080ee