ci: report test coverage

.github/workflows/coverage.yml

@@ -0,0 +1,49 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+name: Coverage
+
+on:
+  push:
+    branches: [ "main" ]
+
+permissions:
+  contents: read
+  pull-requests: read
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: 'go.mod'
+
+      - name: Run tests with coverage
+        run: make test
+
+      - name: Upload coverage to Coveralls
+        if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+        uses: coverallsapp/github-action@v2
+        with:
+          file: coverage.out
+          format: golang

.github/workflows/go.yml

@@ -43,5 +43,5 @@ jobs:
     - name: Build
       run: go build -v ./...
 
-    - name: Test
-      run: go test -v ./...
+    - name: Run Test With coverage
+      run: make test

.gitignore

@@ -0,0 +1,2 @@
+.idea
+coverage.out

Makefile

@@ -0,0 +1,19 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+.PHONY: test
+test:
+	rm -rf coverage.out
+	go test ./... -coverprofile=coverage.out

README.md

@@ -22,6 +22,7 @@
 [![Release](https://img.shields.io/github/release/apache/datasketches-go.svg)](https://github.com/apache/datasketches-go/releases)
 [![GoDoc](https://godoc.org/github.com/apache/datasketches-go?status.svg)](https://godoc.org/github.com/apache/datasketches-go)
 [![License](https://img.shields.io/badge/License-Apache_2.0-blue.svg)](https://github.com/apache/datasketches-go/blob/master/LICENSE)
+[![Coverage Status](https://coveralls.io/repos/github/apache/datasketches-go/badge.svg?branch=main)](https://coveralls.io/github/apache/datasketches-go?branch=main)
 
 # Apache<sup>&reg;</sup> DataSketches&trade; Core Go Library Component
 This is the core Go component of the DataSketches library.  It contains some of the sketching algorithms and can be accessed directly from user applications.
@@ -98,4 +99,4 @@ A Dockerfile is also provided with the necessary env to build and test the proje
 ```
 ./build/Dockerfile
 ./build/run-docker-test.sh
-```
+```