Select Widget Tests

[geekkid1]

There is only one unit test in the repository pertaining to the Select widget, and it doesn't test interaction at all. I need to test interaction of a Select widget for a project of mine, but no matter which selector I use, the Pilot.click() method never seems to properly interact with the expanded option list once the pilot has already clicked on and expanded the widget. How would I go about writing such a test?

[willmcgugan]

Can we see what you tried?

[geekkid1]

First, I tried this:

async with app.run_test() as pilot:
    # make sure it's not expanded to start out
    assert not (app.query_one("#select").expanded)
    # click on it
    await pilot.click("#select")
    # make sure it *is* expanded
    assert app.query_one("#select").expanded
    # click on one of the rows that has appeared under the widget to select an option
    await pilot.click("#select", offset=(0,6))
    # see if it has collapsed
    assert not (app.query_one("#select").expanded) # this fails

Then, at the suggestion of someone on the discord, I tried changing the selector. That resulted in this:

async with app.run_test() as pilot:
    # make sure it's not expanded to start out
    assert not (app.query_one("#select").expanded)
    # click on it
    await pilot.click("#select")
    # make sure it *is* expanded
    assert app.query_one("#select").expanded
    # click on one of the rows that has appeared under the widget to select an option
    await pilot.click("#select SelectOverlay") # I tested this with and without an offset, and with several offset values
    # see if it has collapsed
    assert not (app.query_one("#select").expanded) # this fails

The Select widget starts collapsed, as expected. I have the pilot click on it to expand it, which works. I try to have it click on an option and test to make sure it's collapsed again, but that fails.

[geekkid1]

Or, rather, the click succeeds, but it doesn't actually click on an option or collapse the widget as expected.

[TomJGooding]

Something like this?

from textual.app import App, ComposeResult
from textual.widgets import Select
from textual.widgets._select import SelectOverlay


class SelectApp(App[None]):
    def compose(self) -> ComposeResult:
        yield Select[int]([(str(n), n) for n in range(10)])


async def test_select() -> None:
    async with SelectApp().run_test() as pilot:
        select_widget = pilot.app.query_one(Select)
        assert select_widget.expanded is False

        await pilot.click(Select)
        assert select_widget.expanded is True

        await pilot.click(SelectOverlay, offset=(2, 4))
        assert select_widget.value == 2
        assert select_widget.expanded is False

[geekkid1]

That works! It appears to be a problem with the offset. Maybe all the offset values I tried ended up falling on spaces that weren't interactable.