Function test_async_cbsc001_simple_callback

tests/async_tests/test_async_callbacks.py:33–70

(dash_duo)

@flaky.flaky(max_runs=3)
def test_async_cbsc001_simple_callback(dash_duo):
    if not is_dash_async():
        return
    lock = Lock()

    app = Dash(__name__)
    app.layout = html.Div(
        [
            dcc.Input(id="input", value="initial value"),
            html.Div(html.Div([1.5, None, "string", html.Div(id="output-1")])),
        ]
    )
    call_count = Value("i", 0)

    @app.callback(Output("output-1", "children"), [Input("input", "value")])
    async def update_output(value):
        with lock:
            call_count.value = call_count.value + 1
            return value

    dash_duo.start_server(app)

    dash_duo.wait_for_text_to_equal("#output-1", "initial value")

    input_ = dash_duo.find_element("#input")
    dash_duo.clear_input(input_)

    for key in "hello world":
        with lock:
            input_.send_keys(key)

    dash_duo.wait_for_text_to_equal("#output-1", "hello world")

    assert call_count.value == 2 + len("hello world"), "initial count + each key stroke"

    assert not dash_duo.redux_state_is_loading

    assert dash_duo.get_logs() == []


def test_async_cbsc002_callbacks_generating_children(dash_duo):