Add coverage workflow

Author: jimhester

.github/workflows/test-coverage.yaml

@@ -0,0 +1,59 @@
+on:
+  push:
+    branches:
+      - main
+      - master
+  pull_request:
+    branches:
+      - main
+      - master
+
+name: test-coverage
+
+jobs:
+  test-coverage:
+    runs-on: ubuntu-18.04
+    env:
+      RSPM: https://packagemanager.rstudio.com/cran/__linux__/bionic/latest
+      GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: r-lib/actions/setup-r@v1
+        id: install-r
+
+      - name: Install pak and query dependencies
+        run: |
+          install.packages("pak", repos = "https://r-lib.github.io/p/pak/dev/")
+          saveRDS(pak::pkg_deps("local::.", dependencies = TRUE), ".github/r-depends.rds")
+        shell: Rscript {0}
+
+      - name: Restore R package cache
+        uses: actions/cache@v2
+        with:
+          path: |
+            ${{ env.R_LIBS_USER }}
+            !${{ env.R_LIBS_USER }}/pak
+          key: ubuntu-18.04-${{ steps.install-r.outputs.installed-r-version }}-1-${{ hashFiles('.github/r-depends.rds') }}
+          restore-keys: ubuntu-18.04-${{ steps.install-r.outputs.installed-r-version }}-1-
+
+      - name: Install system dependencies
+        if: runner.os == 'Linux'
+        run: |
+          pak::local_system_requirements(execute = TRUE)
+          pak::pkg_system_requirements("covr", execute = TRUE)
+        shell: Rscript {0}
+
+      - name: Install dependencies
+        run: |
+          pak::local_install_dev_deps(upgrade = TRUE)
+          pak::pkg_install("covr")
+        shell: Rscript {0}
+
+      - name: Test coverage
+        run: |
+          R CMD INSTALL .
+          source shim_package.sh
+          Rscript -e 'covr::codecov()'
+        shell: Rscript {0}