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Configure document-title during updates #1315

Merged
merged 17 commits into from
Jul 9, 2020
Merged

Configure document-title during updates #1315

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6525ca2
Add update_title parameter
stlehmann Jun 13, 2020
3061cba
Save update_title to config
stlehmann Jun 28, 2020
eb427b0
Pass update_title to frontend
stlehmann Jun 28, 2020
28630d9
Use update_title in DocumentTitle component
stlehmann Jun 28, 2020
2f7cdc4
Do not change title if update_title is null
stlehmann Jun 28, 2020
899b20e
Merge branch 'dev' into update-title
stlehmann Jun 28, 2020
f5f97cc
Add changelog entry
stlehmann Jun 28, 2020
1db09c9
Put changelog entry in Unreleased section
stlehmann Jun 29, 2020
8046178
Simplify update_title state assignment
stlehmann Jun 29, 2020
745ba77
Fix config PropType
stlehmann Jun 29, 2020
57f9b37
Update CHANGELOG.md
stlehmann Jun 29, 2020
740b913
Make config PropType more explicit
stlehmann Jun 29, 2020
71ee5ec
Add tests for update_title in test_loading_states.py
stlehmann Jun 30, 2020
bb2a6f7
Fix test function names
stlehmann Jun 30, 2020
571d6ce
Elaborate test sequence
stlehmann Jul 1, 2020
58b1472
Move test out of callback
stlehmann Jul 2, 2020
087774d
Merge branch 'dev' into update-title
alexcjohnson Jul 8, 2020
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108 changes: 108 additions & 0 deletions tests/integration/renderer/test_loading_states.py
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Original file line number Diff line number Diff line change
Expand Up @@ -167,3 +167,111 @@ def find_text(spec):

find_spinners()
find_text({1: 1, 2: 1, 3: 1, 4: 1})


def test_update_title_default(dash_duo):
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lock = Lock()

app = dash.Dash(__name__)

app.layout = html.Div(
children=[
html.H3("Press button see document title updating"),
html.Div(id="output"),
html.Button("Update", id="button", n_clicks=0),
]
)

@app.callback(
Output("output", "children"),
[Input("button", "n_clicks")]
)
def update(n):
with lock:
return n

with lock:
dash_duo.start_server(app)
dash_duo.find_element("#button").click()
assert dash_duo.driver.title == "Updating..."
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Very nice tests! One thing though: your callback will execute on page load, right? So holding the lock while starting the server means we're testing the title during the initialization sequence. That's a good thing to test, but I think in at least one of these tests (and maybe all of them) we should test:

  • during startup, we see the correct updating title
  • when the callback is done we see the regular title
  • when the callback is triggered interactively we see the updating title again

Also rather than a simple assert, for robustness I think it'd be better to do a wait.until, in case things don't happen quite in the expected order:

from dash.testing.wait import until

until(lambda: dash_duo.driver.title == "Updating...", timeout=1)

And one last thing, if you're feeling adventurous: These test cases are nearly identical so they could be parametrized, something like:

import pytest

@pytest.mark.parametrize(
    "kwargs,page_updating_title",
    [
        ({}, "Updating..."),
        ({"updating_title": None}, "Dash"),
        ({"updating_title": ""}, "Dash"),
        ({"updating_title": "Hello World"}, "Hello World")
    ]
)
def test_rdls003_update_title_default(dash_duo, updating_title, page_updating_title)

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I tried to implement your suggestions. I omitted an explicit test for the correct update title on startup because the callback should be called on startup afaik. I hope this is OK. The parametrize decorator is a great thing. Didn't know that until now, thanks :) Hope I did it all right with the locks. I'm not that sure about it.



def test_update_title_None(dash_duo):
lock = Lock()

app = dash.Dash(__name__, update_title=None)

app.layout = html.Div(
children=[
html.H3("Press button see document title updating"),
html.Div(id="output"),
html.Button("Update", id="button", n_clicks=0),
]
)

@app.callback(
Output("output", "children"),
[Input("button", "n_clicks")]
)
def update(n):
with lock:
return n

with lock:
dash_duo.start_server(app)
dash_duo.find_element("#button").click()
assert dash_duo.driver.title == "Dash"


def test_update_title_empty(dash_duo):
lock = Lock()

app = dash.Dash(__name__, update_title="")

app.layout = html.Div(
children=[
html.H3("Press button see document title updating"),
html.Div(id="output"),
html.Button("Update", id="button", n_clicks=0),
]
)

@app.callback(
Output("output", "children"),
[Input("button", "n_clicks")]
)
def update(n):
with lock:
return n

with lock:
dash_duo.start_server(app)
dash_duo.find_element("#button").click()
assert dash_duo.driver.title == "Dash"


def test_update_title_custom(dash_duo):
lock = Lock()

app = dash.Dash(__name__, update_title="Hello World")

app.layout = html.Div(
children=[
html.H3("Press button see document title updating"),
html.Div(id="output"),
html.Button("Update", id="button", n_clicks=0),
]
)

@app.callback(
Output("output", "children"),
[Input("button", "n_clicks")]
)
def update(n):
with lock:
return n

with lock:
dash_duo.start_server(app)
dash_duo.find_element("#button").click()
assert dash_duo.driver.title == "Hello World"