Dash core component unit testing

@mikeypatt wrote:

Hi,
I am trying to write some basic unit tests for a few core components (we have to for my university work.

Here is my code. I am trying to select a crime type in a dcc.Dropown using the dash_duo driver. However, it says that it is not a webelement when trying to use select? In the dropdown there is a “Anti-social behaviour” option to select.

Any help would be massively appreciated

def test_crime_type_callback(dash_duo):

app = Dash(__name__)
app.layout = html.Div([dcc.Dropdown(id="crime-dropdown",options=[ {"label": i, "value": i} for i in crime_mapping],placeholder="Select a Crime Type",),
                      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("crime-dropdown", "value")])
def update_output(selectedCrime):

    return selectedCrime

dash_duo.start_server(app)

#dash_duo.wait_for_text_to_equal("#output-1", "initial value")
#dash_duo.percy_snapshot(name="simple-callback-1")

select = Select(dash_duo.driver.find_element_by_css_selector("#crime-dropdown"))

select.select_by_visible_text('Anti-social behaviour')


dash_duo.wait_for_text_to_equal("#output-1", "Anti-social behaviour")
dash_duo.percy_snapshot(name="simple-callback-2")

# an initial call, one for clearing the input
# and one for each hello world character
assert call_count.value == 1

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