added test

Author: AaronStiff

Diff for: test/percy/plotly-express.py

@@ -543,3 +543,11 @@
 )
 fig = px.timeline(df, x_start="Start", x_end="Finish", y="Task", color="Task")
 fig.write_html(os.path.join(dir_name, "timeline.html"), auto_play=False)
+
+
+px.bar(
+    pd.DataFrame(columns=['A', 'B', 'X']),
+    x = 'A',
+    y = 'X',
+    facet_col = 'B'
+)