Add coverage.

.Rbuildignore

@@ -9,3 +9,4 @@ logo.*
 ^pkgdown$
 cran-comments.md
 ^CRAN-SUBMISSION$
+^codecov\.yml$

.github/workflows/test-coverage.yaml

@@ -0,0 +1,50 @@
+# Workflow derived from https://github.com/r-lib/actions/tree/v2/examples
+# Need help debugging build failures? Start at https://github.com/r-lib/actions#where-to-find-help
+on:
+  push:
+    branches: [main, master]
+  pull_request:
+    branches: [main, master]
+
+name: test-coverage
+
+jobs:
+  test-coverage:
+    runs-on: ubuntu-latest
+    env:
+      GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: r-lib/actions/setup-r@v2
+        with:
+          use-public-rspm: true
+
+      - uses: r-lib/actions/setup-r-dependencies@v2
+        with:
+          extra-packages: any::covr
+          needs: coverage
+
+      - name: Test coverage
+        run: |
+          covr::codecov(
+            quiet = FALSE,
+            clean = FALSE,
+            install_path = file.path(Sys.getenv("RUNNER_TEMP"), "package")
+          )
+        shell: Rscript {0}
+
+      - name: Show testthat output
+        if: always()
+        run: |
+          ## --------------------------------------------------------------------
+          find ${{ runner.temp }}/package -name 'testthat.Rout*' -exec cat '{}' \; || true
+        shell: bash
+
+      - name: Upload test results
+        if: failure()
+        uses: actions/upload-artifact@v3
+        with:
+          name: coverage-test-failures
+          path: ${{ runner.temp }}/package

DESCRIPTION

@@ -32,3 +32,5 @@ NeedsCompilation: yes
 SystemRequirements: C++11
 License: GPL-3
 RoxygenNote: 7.2.3
+Suggests: 
+    covr

README.md

@@ -2,6 +2,7 @@
 
 <!-- badges: start -->
 [![R-CMD-check](https://github.com/swarm-lab/cec/actions/workflows/R-CMD-check.yaml/badge.svg)](https://github.com/swarm-lab/cec/actions/workflows/R-CMD-check.yaml)
+[![Codecov test coverage](https://codecov.io/gh/swarm-lab/cec/branch/master/graph/badge.svg)](https://app.codecov.io/gh/swarm-lab/cec?branch=master)
 [![CRAN status](https://www.r-pkg.org/badges/version/CEC)](https://CRAN.R-project.org/package=CEC)
 [![CRANLOGS downloads](https://cranlogs.r-pkg.org/badges/cec)](https://cran.r-project.org/package=cec)
 <!-- badges: end -->

codecov.yml

@@ -0,0 +1,14 @@
+comment: false
+
+coverage:
+  status:
+    project:
+      default:
+        target: auto
+        threshold: 1%
+        informational: true
+    patch:
+      default:
+        target: auto
+        threshold: 1%
+        informational: true