diff --git a/.github/workflows/test-coverage.yaml b/.github/workflows/test-coverage.yaml
index 2e48acc..222eefe 100644
--- a/.github/workflows/test-coverage.yaml
+++ b/.github/workflows/test-coverage.yaml
@@ -1,3 +1,5 @@
+# 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:
@@ -5,11 +7,12 @@ on:
   pull_request:
     branches:
       - master
+
 name: test-coverage
 
 jobs:
   test-coverage:
-    runs-on: macOS-latest
+    runs-on: ubuntu-latest
     env:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
       ENVIRONMENT: ${{ secrets.ENVIRONMENT }}
@@ -18,10 +21,13 @@ jobs:
       SLACK_ICON_EMOJI: ${{ secrets.SLACK_ICON_EMOJI }}
       SLACK_INCOMING_WEBHOOK_URL: ${{ secrets.SLACK_INCOMING_URL_PREFIX }}
       SLACK_USERNAME: ${{ secrets.SLACK_USERNAME }}
+
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
-      - uses: r-lib/actions/setup-r@v1
+      - uses: r-lib/actions/setup-r@v2
+        with:
+          use-public-rspm: true
 
       - uses: r-lib/actions/setup-pandoc@v1
 
@@ -50,5 +56,25 @@ jobs:
         shell: Rscript {0}
 
       - name: Test coverage
-        run: covr::codecov(quiet = FALSE, function_exclusions = c("slackr_dev", "slackr_tex"))
+        run: |
+          covr::codecov(
+            quiet = FALSE,
+            clean = FALSE,
+            install_path = file.path(Sys.getenv("RUNNER_TEMP"), "package"),
+            function_exclusions = c("slackr_dev", "slackr_tex")
+          )
         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