Modifies test to check that strings are allowed in layout list

Author: leeagustin

tests/integration/test_integration.py

@@ -433,6 +433,8 @@ def test_inin028_layout_as_list(dash_duo):
     app = Dash()
 
     app.layout = [
+        "string1",
+        "string2",
         html.Div("one", id="one"),
         html.Div("two", id="two"),
         html.Button("direct", id="direct"),
@@ -458,6 +460,9 @@ def on_nested_click(n_clicks):
 
     dash_duo.start_server(app)
 
+    dash_duo.wait_for_contains_text("#react-entry-point", "string1")
+    dash_duo.wait_for_contains_text("#react-entry-point", "string2")
+
     dash_duo.wait_for_text_to_equal("#one", "one")
     dash_duo.wait_for_text_to_equal("#two", "two")