[Bug]: out-of-order values cause expect_selected() to fail for shiny.playwright.controller.InputCheckboxGroup

Component

Other

Severity

P3 - Low (minor inconvenience)

Shiny Version

1.5.0

Python Version

3.13.7

Minimal Reproducible Example

from shiny import App, ui
app_ui = ui.page_fluid(
    ui.input_checkbox_group(
        "parameters",
        "Parameters",
        choices={"A": "a", "B": "b", "C": "c", "D": "d"},
        selected=["A"],
        inline=True,
    ),
)
def server(input, output, session):
    pass
app = App(app_ui, server)

## test_checkboxgroup.py
from playwright.sync_api import Page
from shiny.playwright import controller
from shiny.run import ShinyAppProc

def test_cbg_works(page: Page, local_app: ShinyAppProc):
    page.goto(local_app.url)
    input_control = controller.InputCheckboxGroup(page, "parameters")
    input_control.expect_selected(["A"])

def test_cbg_works_with_values_in_same_order(page: Page, local_app: ShinyAppProc):
    page.goto(local_app.url)
    input_control = controller.InputCheckboxGroup(page, "parameters")
    input_control.set(["B", "C"])  # works
    input_control.expect_selected(["B", "C"])  # works

def test_cbg_works_with_values_in_different_order(page: Page, local_app: ShinyAppProc):
    page.goto(local_app.url)
    input_control = controller.InputCheckboxGroup(page, "parameters")
    input_control.set(["B", "A"])  # works
    input_control.expect_selected(["B", "A"])  # does not work

Behavior

Current: Verifying selected checkboxes in a InputCheckboxGroup fails if the list of values is not in the same order as in the checkbox definition.
Expected: Regardless of ordering, the .expect_selected() method should verify and assert that the checkboxes are selected.

Error Messages (if any)

=========================== short test summary info ===========================
FAILED tests/features/test_checkboxgroup.py::test_cbg_works_with_values_in_different_order[chromium] - AssertionError: Locator expected to have attribute 'B'
Actual value: A 
Call log:
  - Expect "to_have_attribute" with timeout 5000ms
  - waiting for locator("div#parameters.shiny-input-checkboxgroup.shiny-bound-input").locator(locator("input[type=checkbox]:checked")).first
    9 × locator resolved to <input value="A" type="checkbox" name="parameters" checked="checked"/>
      - unexpected value "A"
======================== 1 failed, 2 passed in 13.85s =========================
Finished running tests!

Environment

OS: win11
Browser: Chromium 140
uv: 0.9.10
pytest: 8.4.2
playwright: 1.55.0

Start with shiny.playwright.controller.InputCheckboxGroup.expect_selected and the reproduced tests in tests/features/test_checkboxgroup.py. Run test_cbg_works_with_values_in_different_order and compare it with the passing same-order case. Done means expect_selected(["B", "A"]) verifies the selected checkboxes regardless of their definition order.