Add codecov

.github/workflows/test.yml

@@ -1,15 +1,25 @@
 name: test
 on: [push, pull_request]
 jobs:
-  test-nocache:
-    strategy:
-      matrix:
-        go-version: [1.22.x, 1.23.x]
+  test:
+    name: Run tests and collect coverage
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-go@v5
+      - name: Checkout
+        uses: actions/checkout@v4
         with:
-          go-version: ${{ matrix.go-version }}
-          cache: false
-      - run: go test ./...
+          fetch-depth: 0
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+
+      - name: Install dependencies
+        run: go mod download
+
+      - name: Run tests
+        run: go test -race -coverprofile=coverage.txt ./...
+
+      - name: Upload results to Codecov
+        uses: codecov/codecov-action@v4
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}

README.md

@@ -1,6 +1,7 @@
 # ICU MessageFormat for Golang
 
 [![test](/~https://github.com/fullpipe/icu-mf/actions/workflows/test.yml/badge.svg)](/~https://github.com/fullpipe/icu-mf/actions/workflows/test.yml)
+[![codecov](https://codecov.io/github/fullpipe/icu-mf/graph/badge.svg?token=W6C02M3BFQ)](https://codecov.io/github/fullpipe/icu-mf)
 [![lint](/~https://github.com/fullpipe/icu-mf/actions/workflows/lint.yml/badge.svg)](/~https://github.com/fullpipe/icu-mf/actions/workflows/lint.yml)
 
 Messages in your application are never static. They have variables, pluralization, and formatting.