diff --git a/.github/workflows/notebooks.yaml b/.github/workflows/notebooks.yaml
index e1cd908..c235e1d 100644
--- a/.github/workflows/notebooks.yaml
+++ b/.github/workflows/notebooks.yaml
@@ -51,7 +51,9 @@ jobs:
           pip install pytest nbmake
 
       - name: "Test notebooks: pytest --nbmake"
-        run: pytest --nbmake -- **/*ipynb
+        run: |
+          echo "testing notebooks"
+          pytest --nbmake -- **/test_*.ipynb
 
       - name: Upload logs as artefacts
         if: always()
diff --git a/notebooks/test_happy.ipynb b/notebooks/test_happy.ipynb
new file mode 100644
index 0000000..6bdaad6
--- /dev/null
+++ b/notebooks/test_happy.ipynb
@@ -0,0 +1,35 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "0fecf498-25b1-4608-ab9d-15f0c13e1949",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "print(\"I'm a happy notebook.\")"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3 (ipykernel)",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.11.4"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}
diff --git a/pyproject.toml b/pyproject.toml
index b191d99..07f88cd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -81,7 +81,7 @@ lint = "pre-commit run --all-files"
 complete = { call = "tasks.complete:main", help = "Create autocomplete files for bash and fish" }
 
 [tool.pdm.dev-dependencies]
-test = ["pdm[pytest]", "pytest-cov"]
+test = ["nbmake", "pdm[pytest]", "pytest-cov"]
 tox = ["tox", "tox-pdm>=0.5"]
 docs = ["sphinx>=7.2.6", "sphinx-copybutton>=0.5.2"]
 dev = ["tox>=4.11.3", "tox-pdm>=0.7.0"]