#948 add pytest

tests/test_chart.py

@@ -109,3 +109,25 @@ def test_replace_chart(screen: Screen):
     screen.click('Replace')
     screen.should_contain('B')
     screen.should_not_contain('A')
+
+
+def test_stock_chart(screen: Screen):
+    """https://github.com/zauberzeug/nicegui/discussions/948"""
+    chart = ui.chart({'legend': {'enabled': True}, 'series': []}, type='stockChart', extras=['stock'])
+    ui.button('update', on_click=lambda: (
+        chart.options['series'].extend([{'name': 'alice'}, {'name': 'bob'}]),
+        chart.update(),
+    ))
+    ui.button('clear', on_click=lambda: (
+        chart.options['series'].clear(),
+        chart.update(),
+    ))
+
+    screen.open('/')
+    screen.click('update')
+    screen.should_contain('alice')
+    screen.should_contain('bob')
+    screen.click('clear')
+    screen.wait(0.5)
+    screen.should_not_contain('alice')
+    screen.should_not_contain('bob')