diff --git a/.github/workflows/bootstrap.yml b/.github/workflows/bootstrap.yml
index e7ac89ed..b3f83a7f 100644
--- a/.github/workflows/bootstrap.yml
+++ b/.github/workflows/bootstrap.yml
@@ -69,6 +69,14 @@ jobs:
           echo Looking for "'$PATTERN'" in output of 'just'
           grep "$PATTERN" run-client-app-output
 
+      - name: Test run dev environment
+        run: |
+          cd ~/work/my-project
+          nix develop .# -c just run --beam-on 12 | tee build-and-run-in-devenv-output
+          PATTERN="end of event 12"
+          echo Looking for "'$PATTERN'" in output of 'just'
+          grep "$PATTERN" build-and-run-in-devenv-output
+
       - name: Test nix build client package
         run: |
           nix build   ~/work/my-project#
diff --git a/templates/basic/.github/workflows/test.yml b/templates/basic/.github/workflows/test.yml
index f3d9452f..fe56516b 100644
--- a/templates/basic/.github/workflows/test.yml
+++ b/templates/basic/.github/workflows/test.yml
@@ -62,6 +62,13 @@ jobs:
       - name: Run test suite
         run: nix develop .#${{ matrix.devshell }} -c just test
 
+      - name: Test run in dev environment
+        run: |
+          nix develop .# -c just run --beam-on 12 | tee build-and-run-in-devenv-output
+          PATTERN="end of event 12"
+          echo Looking for "'$PATTERN'" in output of 'just'
+          grep "$PATTERN" build-and-run-in-devenv-output
+
       - name: Test nix build default package
         run: |
           nix build ./#