diff --git a/.github/workflows/ci-cd.yml b/.github/workflows/ci-cd.yml
index c02a3b7..e4d4bd9 100644
--- a/.github/workflows/ci-cd.yml
+++ b/.github/workflows/ci-cd.yml
@@ -64,7 +64,7 @@ jobs:
           path: dist
 
       - name: Install build + test dependencies
-        run: pip install pytest dist/*.whl
+        run: pip install pytest dist/*.whl nbconvert ipykernel
 
       - name: Test package
         run: jupyter nbconvert examples/**/*.ipynb src/**/*.ipynb --to=notebook --execute --output-dir=$(mktemp -d)
diff --git a/src/literary/core/transformers.ipynb b/src/literary/core/transformers.ipynb
index 53eb2f1..288d5c1 100644
--- a/src/literary/core/transformers.ipynb
+++ b/src/literary/core/transformers.ipynb
@@ -16,14 +16,7 @@
    "cell_type": "code",
    "execution_count": 1,
    "id": "eaa04dfe-1007-44a8-ad14-28f16f82f5c5",
-   "metadata": {
-    "execution": {
-     "iopub.execute_input": "2021-05-17T16:24:07.671316Z",
-     "iopub.status.busy": "2021-05-17T16:24:07.670669Z",
-     "iopub.status.idle": "2021-05-17T16:24:07.959810Z",
-     "shell.execute_reply": "2021-05-17T16:24:07.958354Z"
-    }
-   },
+   "metadata": {},
    "outputs": [],
    "source": [
     "%load_ext literary.notebook\n",
@@ -38,12 +31,6 @@
    "execution_count": 2,
    "id": "extended-national",
    "metadata": {
-    "execution": {
-     "iopub.execute_input": "2021-05-17T16:24:07.965391Z",
-     "iopub.status.busy": "2021-05-17T16:24:07.964182Z",
-     "iopub.status.idle": "2021-05-17T16:24:07.967385Z",
-     "shell.execute_reply": "2021-05-17T16:24:07.968202Z"
-    },
     "tags": [
      "export"
     ]
@@ -62,12 +49,6 @@
    "execution_count": 3,
    "id": "elect-event",
    "metadata": {
-    "execution": {
-     "iopub.execute_input": "2021-05-17T16:24:07.974379Z",
-     "iopub.status.busy": "2021-05-17T16:24:07.973776Z",
-     "iopub.status.idle": "2021-05-17T16:24:07.977045Z",
-     "shell.execute_reply": "2021-05-17T16:24:07.977552Z"
-    },
     "tags": [
      "export"
     ]
@@ -82,12 +63,6 @@
    "execution_count": 4,
    "id": "opponent-bottle",
    "metadata": {
-    "execution": {
-     "iopub.execute_input": "2021-05-17T16:24:07.981273Z",
-     "iopub.status.busy": "2021-05-17T16:24:07.980672Z",
-     "iopub.status.idle": "2021-05-17T16:24:07.983199Z",
-     "shell.execute_reply": "2021-05-17T16:24:07.983787Z"
-    },
     "tags": [
      "export"
     ]
@@ -118,12 +93,6 @@
    "execution_count": 5,
    "id": "swedish-denial",
    "metadata": {
-    "execution": {
-     "iopub.execute_input": "2021-05-17T16:24:07.995409Z",
-     "iopub.status.busy": "2021-05-17T16:24:07.994720Z",
-     "iopub.status.idle": "2021-05-17T16:24:07.998263Z",
-     "shell.execute_reply": "2021-05-17T16:24:07.997281Z"
-    },
     "tags": [
      "export"
     ]
@@ -175,14 +144,7 @@
    "cell_type": "code",
    "execution_count": 6,
    "id": "imperial-character",
-   "metadata": {
-    "execution": {
-     "iopub.execute_input": "2021-05-17T16:24:08.004341Z",
-     "iopub.status.busy": "2021-05-17T16:24:08.003348Z",
-     "iopub.status.idle": "2021-05-17T16:24:08.005602Z",
-     "shell.execute_reply": "2021-05-17T16:24:08.004995Z"
-    }
-   },
+   "metadata": {},
    "outputs": [],
    "source": [
     "ipython_transformer = IPythonTransformer(error_if_ipython=True)"
@@ -200,14 +162,7 @@
    "cell_type": "code",
    "execution_count": 7,
    "id": "transsexual-chart",
-   "metadata": {
-    "execution": {
-     "iopub.execute_input": "2021-05-17T16:24:08.009670Z",
-     "iopub.status.busy": "2021-05-17T16:24:08.009018Z",
-     "iopub.status.idle": "2021-05-17T16:24:08.011318Z",
-     "shell.execute_reply": "2021-05-17T16:24:08.011828Z"
-    }
-   },
+   "metadata": {},
    "outputs": [],
    "source": [
     "node = ast.parse(\"get_ipython().magic('matplotlib inline')\")"
@@ -225,14 +180,7 @@
    "cell_type": "code",
    "execution_count": 8,
    "id": "guided-planning",
-   "metadata": {
-    "execution": {
-     "iopub.execute_input": "2021-05-17T16:24:08.016506Z",
-     "iopub.status.busy": "2021-05-17T16:24:08.015891Z",
-     "iopub.status.idle": "2021-05-17T16:24:08.018662Z",
-     "shell.execute_reply": "2021-05-17T16:24:08.018038Z"
-    }
-   },
+   "metadata": {},
    "outputs": [],
    "source": [
     "with pytest.raises(ValueError):\n",
@@ -253,12 +201,6 @@
    "execution_count": 9,
    "id": "indonesian-prior",
    "metadata": {
-    "execution": {
-     "iopub.execute_input": "2021-05-17T16:24:08.031708Z",
-     "iopub.status.busy": "2021-05-17T16:24:08.031058Z",
-     "iopub.status.idle": "2021-05-17T16:24:08.035317Z",
-     "shell.execute_reply": "2021-05-17T16:24:08.033968Z"
-    },
     "tags": [
      "export"
     ]
@@ -360,14 +302,7 @@
    "cell_type": "code",
    "execution_count": 10,
    "id": "rental-ladder",
-   "metadata": {
-    "execution": {
-     "iopub.execute_input": "2021-05-17T16:24:08.040967Z",
-     "iopub.status.busy": "2021-05-17T16:24:08.040280Z",
-     "iopub.status.idle": "2021-05-17T16:24:08.042713Z",
-     "shell.execute_reply": "2021-05-17T16:24:08.042069Z"
-    }
-   },
+   "metadata": {},
    "outputs": [],
    "source": [
     "transformer = PatchTransformer(patch_decorator_id=\"patch\")"
@@ -377,14 +312,7 @@
    "cell_type": "code",
    "execution_count": 11,
    "id": "speaking-yellow",
-   "metadata": {
-    "execution": {
-     "iopub.execute_input": "2021-05-17T16:24:08.046797Z",
-     "iopub.status.busy": "2021-05-17T16:24:08.046189Z",
-     "iopub.status.idle": "2021-05-17T16:24:08.049001Z",
-     "shell.execute_reply": "2021-05-17T16:24:08.048399Z"
-    }
-   },
+   "metadata": {},
    "outputs": [],
    "source": [
     "node = ast.parse(\n",
@@ -407,31 +335,27 @@
    "cell_type": "code",
    "execution_count": 12,
    "id": "polyphonic-airfare",
-   "metadata": {
-    "execution": {
-     "iopub.execute_input": "2021-05-17T16:24:08.053388Z",
-     "iopub.status.busy": "2021-05-17T16:24:08.052793Z",
-     "iopub.status.idle": "2021-05-17T16:24:08.055769Z",
-     "shell.execute_reply": "2021-05-17T16:24:08.055148Z"
-    }
-   },
+   "metadata": {},
    "outputs": [],
    "source": [
     "new_node = transformer.visit(node)"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "8b266ea1-cf33-4911-bca6-2141119d3a15",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "raise ValueError"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 13,
    "id": "charitable-regular",
-   "metadata": {
-    "execution": {
-     "iopub.execute_input": "2021-05-17T16:24:08.060187Z",
-     "iopub.status.busy": "2021-05-17T16:24:08.059551Z",
-     "iopub.status.idle": "2021-05-17T16:24:08.063878Z",
-     "shell.execute_reply": "2021-05-17T16:24:08.063338Z"
-    }
-   },
+   "metadata": {},
    "outputs": [
     {
      "name": "stdout",