# matryer/is

Professional lightweight testing mini-framework for Go.

Repository: https://github.com/matryer/is
Canonical: https://ross.abutalabs.com/products/is
Language: Go
License: MIT
License Family: permissive
Topics: golang, testing
Last push: 2024-02-08T21:33:15+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 3557, "days_push": 937, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1975, forks 67 (observed 2026-08-28T04:06:01.282965+00:00)

## What it is
A lightweight testing mini-framework for Go that provides a simple assertion API (is.Equal, is.True, is.NoErr, is.Fail) on top of the standard testing package. It produces readable, colorized failure messages and lets you add descriptions via inline comments.

## Use cases
- write unit tests in go with simple assertions
- assert equality in go tests
- check errors are nil in go tests
- get readable test failure messages
- replace verbose testify assertions with a minimal library

## When to choose
- you want a tiny, dependency-light assertion library for Go tests
- you value readable failure output with comment-based descriptions
- you prefer a minimal API over full-featured frameworks like testify

## When to avoid
- you need advanced features like mocking, test suites, or table-driven helpers
- you require BDD-style testing or extensive assertion matchers
- your project already standardizes on another assertion framework

## Facets
- artifact type: library
- maturity: stable
- function: testing
- domain: testing, developer-tools
- platform: go, cli
- tags: assertion-library, unit-testing, lightweight, test-assertions

## Member repositories
- matryer/is (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:01.282965+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:04:53.863855+00:00, confidence not recorded.
  - readme: https://github.com/matryer/is (fetched 2026-08-28T04:06:01.282965+00:00, sha f4908012551a)
- Data as of 2026-08-30T08:39:29.467469+00:00.