Add code coverage to CI

.gitattributes

@@ -0,0 +1 @@
+*.go text eol=lf

.github/workflows/test.yml

@@ -1,21 +1,49 @@
 name: test
-on: [push, pull_request]
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
 
 permissions:
   contents: read
 
+env:
+  TESTFLAGS: -v
+  BUILDFLAGS: -v
+
 jobs:
-  test:
+  build:
     strategy:
       matrix:
         go-version: [1.20.x, 1.21.x]
         os: [ubuntu-latest, windows-latest, macos-latest]
     runs-on: ${{ matrix.os }}
     timeout-minutes: 10
     steps:
-      - uses: actions/setup-go@v4
-        with:
-          go-version: ${{ matrix.go-version }}
-      - uses: actions/checkout@v3
-      - name: Test
-        run: go test -v ./...
+    - uses: actions/checkout@v3
+
+    - name: Set up Go
+      uses: actions/setup-go@v4
+      with:
+        go-version: ${{ matrix.go-version }}
+
+    - name: Build
+      run: |
+        make build
+
+    - name: lint
+      uses: golangci/golangci-lint-action@v3
+      with:
+        version: v1.53
+        args: --print-resources-usage --timeout=10m --verbose
+
+    - name: Test
+      run: |
+        make coverage
+
+    - name: Codecov
+      uses: codecov/codecov-action@v3
+      with:
+        directory: ./

.gitignore

@@ -0,0 +1,2 @@
+# Cover profiles
+*.out

Makefile

@@ -0,0 +1,25 @@
+# Project packages.
+PACKAGES=$(shell go list ./...)
+
+# Flags passed to `go test`
+BUILDFLAGS ?= 
+TESTFLAGS ?= 
+
+.PHONY: all build test coverage
+.DEFAULT: all
+
+all: build
+
+build: ## no binaries to build, so just check compilation suceeds
+	go build ${BUILDFLAGS} ./...
+
+test: ## run tests
+	go test ${TESTFLAGS} ./...
+
+coverage: ## generate coverprofiles from the unit tests
+	rm -f coverage.txt
+	go test ${TESTFLAGS} -cover -coverprofile=cover.out ./...
+
+.PHONY: help
+help:
+	@awk 'BEGIN {FS = ":.*##"; printf "\nUsage:\n  make \033[36m\033[0m\n"} /^[a-zA-Z_\/%-]+:.*?##/ { printf "  \033[36m%-27s\033[0m %s\n", $$1, $$2 } /^##@/ { printf "\n\033[1m%s\033[0m\n", substr($$0, 5) } ' $(MAKEFILE_LIST)

README.md

@@ -7,6 +7,7 @@ Go library to handle references to container images.
 [![Build Status](https://github.com/distribution/reference/actions/workflows/test.yml/badge.svg?branch=main&event=push)](https://github.com/distribution/reference/actions?query=workflow%3ACI)
 [![GoDoc](https://img.shields.io/badge/go.dev-reference-007d9c?logo=go&logoColor=white&style=flat-square)](https://pkg.go.dev/github.com/distribution/reference)
 [![License: Apache-2.0](https://img.shields.io/badge/License-Apache--2.0-blue.svg)](LICENSE)
+[![codecov](https://codecov.io/gh/distribution/reference/branch/main/graph/badge.svg)](https://codecov.io/gh/distribution/reference)
 [![FOSSA Status](https://app.fossa.com/api/projects/custom%2B162%2Fgithub.com%2Fdistribution%2Freference.svg?type=shield)](https://app.fossa.com/projects/custom%2B162%2Fgithub.com%2Fdistribution%2Freference?ref=badge_shield)
 
 This repository contains a library for handling refrences to container images held in container registries. Please see [godoc](https://pkg.go.dev/github.com/distribution/reference) for details.