adding test for descendant listening

Author: BSd3v

tests/integration/renderer/test_descendant_listening.py

@@ -0,0 +1,57 @@
+from dash import dcc, html, Input, Output, Patch, Dash
+
+from dash.testing.wait import until
+
+
+def test_dcl001_descendant_tabs(dash_duo):
+    app = Dash()
+
+    app.layout = html.Div(
+        [
+            html.Button("Enable Tabs", id="button", n_clicks=0),
+            html.Button("Add Tabs", id="add_button", n_clicks=0),
+            dcc.Store(id="store-data", data=None),
+            dcc.Tabs(
+                [
+                    dcc.Tab(label="Tab A", value="tab-a", id="tab-a", disabled=True),
+                    dcc.Tab(label="Tab B", value="tab-b", id="tab-b", disabled=True),
+                ],
+                id="tabs",
+                value="tab-a",
+            ),
+        ]
+    )
+
+    @app.callback(Output("store-data", "data"), Input("button", "n_clicks"))
+    def update_store_data(clicks):
+        if clicks > 0:
+            return {"data": "available"}
+        return None
+
+    @app.callback(
+        Output("tabs", "children"),
+        Input("add_button", "n_clicks"),
+        prevent_initial_call=True,
+    )
+    def add_tabs(n):
+        children = Patch()
+        children.append(dcc.Tab(label=f"{n}", value=f"{n}", id=f"test-{n}"))
+        return children
+
+    @app.callback(
+        Output("tab-a", "disabled"),
+        Output("tab-b", "disabled"),
+        Input("store-data", "data"),
+    )
+    def toggle_tabs(store_data):
+        if store_data is not None and "data" in store_data:
+            return False, False
+        return True, True
+
+    dash_duo.start_server(app)
+    dash_duo.wait_for_text_to_equal("#button", f"Enable Tabs")
+    dash_duo.find_element("#tab-a.tab--disabled")
+    dash_duo.find_element("#button").click()
+    dash_duo.find_element("#tab-a:not(.tab--disabled)")
+    dash_duo.find_element("#add_button").click()
+    dash_duo.find_element("#test-1:not(.tab--disabled)")