test_children_add_and_remove_without_error[ReactChildren] AssertionError: Locator expected to have text 'A Markdown pane!' Actual value: <element(s) not found> Call log: LocatorAssertions.to_have_text with timeout 5000ms - waiting for locator("#container")

test_player_visible_buttons AssertionError: assert False + where False = is_visible('.play') + where is_visible = <Page url='http://localhost:45713/'>.is_visible