build: add code coverage

.github/workflows/coverage.yaml

@@ -0,0 +1,47 @@
+name: coverage
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: DeLaGuardo/setup-clojure@master
+        with:
+          cli: latest
+
+      - name: Setup Java
+        uses: actions/setup-java@v2
+        with:
+          distribution: adopt
+          java-version: 17
+
+      - name: Cache m2
+        uses: actions/cache@v2
+        with:
+          path: ~/.m2
+          key: m2-${{ hashFiles('deps.edn') }}
+
+      - name: Cache gitlibs
+        uses: actions/cache@v2
+        with:
+          path: ~/.gitlibs
+          key: gitlibs-${{ hashFiles('deps.edn') }}
+
+      - name: Install dependencies
+        run: clojure -P -M:test:coverage
+
+      - name: generate coverage report
+        run: |
+            CLOVERAGE_VERSION=1.2.4 clojure -M:test:coverage --codecov || :
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v1
+        with:
+          fail_ci_if_error: true
+          file: ./target/coverage/codecov.json

README.md

@@ -3,6 +3,8 @@
 <div align="center">
 
 [![Build Status][build-status]][build-status-url]
+[![License][license]][license-url]
+[![Codecov branch][codecov]][codecov-url]
 [![Linter][linter]][linter-url]
 ![Stability: Experimental][experimental-badge]
 
@@ -110,6 +112,8 @@ Distributed under the [Apache 2.0](LICENSE) license. See [LICENSE](LICENSE).
 [build-status-url]: https://github.com/InferenceQL/gen.clj/actions/workflows/tests.yaml?query=branch%3Amain
 [build-status]: https://github.com/InferenceQL/gen.clj/workflows/tests/badge.svg?branch=main
 [clerk-url]: https://github.com/nextjournal/clerk
+[codecov-url]: https://codecov.io/github/inferenceql/gen.clj
+[codecov]: https://img.shields.io/codecov/c/github/inferenceql/gen.clj/main.svg?maxAge=3600
 [experimental-badge]: https://img.shields.io/badge/stability-experimental-orange.svg
 [gen-clj-url]: https://github.clerk.garden/inferenceql/gen.clj
 [license-url]: LICENSE

deps.edn

@@ -31,6 +31,13 @@
    :exec-fn cognitect.test-runner.api/test
    :exec-args ["test"]}
 
+  :coverage
+  ;; Invoke with clj -M:test:coverage <args>
+  {:main-opts ["-m" "cloverage.coverage"
+               "-p" "src"
+               "-s" "test"]
+   :extra-deps {cloverage/cloverage {:mvn/version "1.2.4"}}}
+
   :build
   {:deps
    {io.github.clojure/tools.build {:git/tag "v0.9.4" :git/sha "76b78fe"}