# Install counterfeiter with Homebrew Tool for generating self-contained, type-safe test doubles in go. Version 6.12.2 via Homebrew; verified 2026-07-25. ## Install ```sh sudo av install brew:counterfeiter ``` Additional install commands: ### macOS - Homebrew (100%): ```sh brew install counterfeiter ``` Evidence: local Homebrew formula metadata ## Package facts - **Package key:** brew:counterfeiter - **Package manager:** Homebrew - **Package manager page:** - **Version:** 6.12.2 - **Source summary:** Tool for generating self-contained, type-safe test doubles in go - **Homepage:** - **Repository:** - **License:** MIT - **Source archive:** - **Last updated:** 2026-07-25T14:20:51-04:00 - **Generated:** 2026-08-04T22:13:35+00:00 ## Executables - counterfeiter (cli) - counterfeiter (alias) ## Dependencies - go ## Install behavior - Post-install hook: not defined - Bottle: available on arm64_linux, arm64_sequoia, arm64_sonoma, arm64_tahoe, sonoma, x86_64_linux ## Freshness - Page generated: 2026-08-04 - Package-manager version: 6.12.2 - Package-manager updated: 2026-07-25 - Local data: ok - Upstream repository: https://github.com/maxbrunsfeld/counterfeiter - Upstream latest detected: v6.12.2 (current) ## Project history and usage counterfeiter is a Go code generator for creating self-contained, type-safe test doubles from interfaces. ### Project history The public repository was created in 2014. Its README frames the project around a Go-specific testing problem: fake implementations are useful for unit tests but cannot be generated automatically at runtime in Go. The project has continued through a v6 release line, with current documentation using Go modules and Go tool dependencies. ### Adoption history counterfeiter's documented workflow follows Go ecosystem conventions: add it as a tool dependency, place `go:generate` or `counterfeiter:generate` directives near interfaces, and regenerate fakes with `go generate`. The README notes that the project has largely been maintained by the community, which fits its role as a small but durable testing utility rather than a framework-owned generator. ### How it is used Typical use is to generate fakes for interfaces in the same module or for third-party interfaces, then import the generated `foofakes` package in tests to inspect call counts, arguments, and stubbed return values. ### Why package nerds care For package maintainers, counterfeiter is a good example of a Go CLI whose preferred installation changed with Go tooling: Homebrew can ship a binary, but the upstream docs now prefer module-pinned tool dependencies for reproducible generation. ### Timeline - 2014: Public GitHub repository created. - 2024: v6.8.x through v6.11.x releases published. - 2026: v6.12.2 release published. ### Related projects - go generate - Go modules - Go tool dependencies ### Sources - - - ## Security Notes narrow executable package without higher-risk signals. - **Geiger risk:** green / low - narrow executable package without higher-risk signals ## Source Database Details - **Source Database:** Homebrew formula API - **Tap:** homebrew/core - **Full Name:** counterfeiter - **Version Scheme:** 0 - **Revision:** 0 - **Head Version:** HEAD - **Bottle Stable Root URL:** - **Deprecated:** no - **Disabled:** no - **Keg Only:** no - **URL Keys:** head, stable ## Related links - [Source-control packages](https://pkg.so/source-control-tools/) - Belongs to a source-control command family. - [Terminal utility packages](https://pkg.so/terminal-utilities/) - Matched terminal and command-line workflow metadata. - [Text processing packages](https://pkg.so/text-processing-tools/) - Matched text, document, or structured-data processing metadata. - [Developer build packages](https://pkg.so/developer-build-tools/) - Matched build, compiler, generator, or developer workflow metadata. - [go](https://pkg.so/brew/go/) - Runtime dependency declared by Homebrew. - [mockery](https://pkg.so/brew/mockery/) - Shares pkgdb curated category or tags: cli, code-generation, developer-tools, go, testing. - [mockolo](https://pkg.so/brew/mockolo/) - Shares pkgdb curated category or tags: cli, code-generation, developer-tools, testing. - [protoc-gen-go-grpc](https://pkg.so/brew/protoc-gen-go-grpc/) - Shares pkgdb curated category or tags: cli, code-generation, developer-tools, go. - [richgo](https://pkg.so/brew/richgo/) - Shares pkgdb curated category or tags: cli, developer-tools, go, testing. - [gor](https://pkg.so/brew/gor/) - Shares pkgdb curated category or tags: cli, developer-tools, go, testing. - [fake-gcs-server](https://pkg.so/brew/fake-gcs-server/) - Shares pkgdb curated category or tags: cli, developer-tools, go, testing. - [lcov](https://pkg.so/brew/lcov/) - Shares pkgdb curated category or tags: cli, developer-tools, testing. - [bats-core](https://pkg.so/brew/bats-core/) - Shares pkgdb curated category or tags: cli, developer-tools, testing. - [ifacemaker](https://pkg.so/brew/ifacemaker/) - Both packages touch the same language runtime or ecosystem. Shared terms: cli, code, code-generation, developer, developer-tools. - [trpc-cli](https://pkg.so/npm/trpc-cli/) - Local package facts share a topical domain. Shared terms: cli, code, code-generation, developer, developer-tools. ## Combined YAML source View the package source record on GitHub. [combined/counterfeiter.yml](https://github.com/mxcl/pkgdb/blob/main/combined/counterfeiter.yml) ## Sources - pkg.so package database - Geiger risk classifier - package-page enrichment - curated package history - package version freshness - pkgdb category and tag curation - package relationship graph - cross-ecosystem install command graph