ci: add coverage integration using Codecov tool

Signed-off-by: Rosy-Glorious Miki <rmiki@redhat.com>

Author: rosygmiki

.github/workflows/ci.yml

@@ -21,6 +21,11 @@ jobs:
           sudo apt-get install -y make tar diffutils bzip2 gzip curl git
       - name: Run make
         run: make
+      - name: Upload coverage artifact
+        uses: actions/upload-artifact@v5
+        with:
+          name: coverage
+          path: test/coverage/coverage.out
 
   test-fedora:
     name: Build and test Fedora on multiple runners
@@ -101,3 +106,24 @@ jobs:
           choco install -y make diffutils gzip bzip2 git
       - name: Build and test
         run: bash -c "make"
+
+  upload-coverage:
+    name: Run tests and upload coverage
+    runs-on: ubuntu-latest
+    needs: [ test-makefile ]
+    if: github.event_name == 'pull_request'
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+      - name: Download coverage artifact
+        uses: actions/download-artifact@v8
+        with:
+          name: coverage
+      - name: Upload results to Codecov
+        uses: codecov/codecov-action@v5
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          files: ${{ github.workspace }}/test/coverage/coverage.out
+

Makefile

@@ -70,8 +70,8 @@ integration-test: build
 
 unit-test:
 	mkdir -p $(GOCOVERDIR)
-	go test $(GOFLAGS) -coverprofile=$(GOCOVERDIR)/unit.out ./...
-	go tool cover -func=$(GOCOVERDIR)/unit.out
+	go test $(GOFLAGS) -coverprofile=$(GOCOVERDIR)/coverage.out ./...
+	go tool cover -func=$(GOCOVERDIR)/coverage.out
 
 test: unit-test integration-test
 

README.md

@@ -1,3 +1,5 @@
+[![codecov](https://codecov.io/gh/rmiki-dev/tar-diff/graph/badge.svg)](https://codecov.io/gh/rmiki-dev/tar-diff)
+
 # tar-diff
 
 `tar-diff` is a golang library and set of commandline tools to diff and patch tar files.
@@ -40,4 +42,4 @@ The `tar-diff` file format is described in [file-format.md](file-format.md).
 ## License
 
 `tar-diff` is licensed under the Apache License, Version 2.0. See
-[LICENSE](LICENSE) for the full license text.
+[LICENSE](LICENSE) for the full license text.