diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 1cd1aae3..5ca7f787 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -25,6 +25,15 @@ jobs:
       - name: Run unit tests
         run: go test -v -cover -coverprofile=${TEST_COVERAGE_FILE} ./...
 
+      - run: |
+          tail -n +2 ${TEST_COVERAGE_FILE} | while read line; do
+            if [[ "$(echo "${line##* }")" == "0" ]]; then
+              file_name=$(echo -n "${line}" | cut -d: -f1 | sed 's|github.com/canonical/chisel/||g')
+              line_number=$(echo -n "${line}" | cut -d: -f2 | cut -d. -f1)
+              echo "::warning file=$file_name,line=$line_number::Not tested"
+            fi
+          done
+
       - name: Convert test coverage to HTML
         if: always()
         continue-on-error: true
diff --git a/internal/apachetestutil/manifest.go b/internal/apachetestutil/manifest.go
index cb3006f8..ced8f7a4 100644
--- a/internal/apachetestutil/manifest.go
+++ b/internal/apachetestutil/manifest.go
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: Apache-2.0
-
+// test
 package apachetestutil
 
 import (
@@ -21,7 +21,7 @@ func DumpManifestContents(c *check.C, mfest *manifest.Manifest) *ManifestContent
 		slices = append(slices, slice)
 		return nil
 	})
-	c.Assert(err, check.IsNil)
+	c.Assert(err, check.IsNil) // testme
 
 	var pkgs []*manifest.Package
 	err = mfest.IteratePackages(func(pkg *manifest.Package) error {
diff --git a/internal/cache/cache_test.go b/internal/cache/cache_test.go
index 1ad7f397..51b30d1c 100644
--- a/internal/cache/cache_test.go
+++ b/internal/cache/cache_test.go
@@ -1,5 +1,5 @@
 package cache_test
-
+// foo
 import (
 	. "gopkg.in/check.v1"