test(flet-test): simplify counter test to plain pump_and_settle + assert

Drop the _find_text_when_ready polling helper. It was a band-aid for the
android render race, but the real cause was the serious_python x86_64 crash
(PR #218) — now fixed. Try the plain template-style test and let CI confirm the
counter renders in time on the slow emulator.

Author: FeodorFitsner

sdk/python/examples/apps/flet_test_counter/tests/test_main.py

@@ -1,42 +1,21 @@
-import asyncio
-import contextlib
-import time
-
 import flet.testing as ftt
 
 
-async def _find_text_when_ready(tester, text: str, timeout: float = 60.0):
-    """
-    Pump-and-retry (up to `timeout` seconds) until a control with `text` appears.
-
-    On a device the app runs embedded Python over dart_bridge; its cold start
-    (interpreter init + `import flet` + running `main()`) can take tens of
-    seconds on a slow CI emulator, so the first python-driven frame may land
-    well after the device driver's fixed warmup. `pump_and_settle` only settles
-    Flutter frames — it can't know a python -> dart round-trip is still in
-    flight — so poll rather than assert on the first frame.
-    """
-    deadline = time.monotonic() + timeout
-    while True:
-        finder = await tester.find_by_text(text)
-        if finder.count >= 1 or time.monotonic() >= deadline:
-            return finder
-        await asyncio.sleep(0.25)
-        with contextlib.suppress(TimeoutError):
-            await tester.pump_and_settle()
-
-
 async def test_counter(flet_app: ftt.FletTestApp):
     tester = flet_app.tester
 
-    # Initial state (wait for the app's first render).
-    assert (await _find_text_when_ready(tester, "0")).count == 1
+    await tester.pump_and_settle()
+
+    # Initial state
+    assert (await tester.find_by_text("0")).count == 1
 
     # Increment once
     await tester.tap(await tester.find_by_key("increment"))
-    assert (await _find_text_when_ready(tester, "1")).count == 1
+    await tester.pump_and_settle()
+    assert (await tester.find_by_text("1")).count == 1
 
     # Decrement twice -> -1
     await tester.tap(await tester.find_by_key("decrement"))
     await tester.tap(await tester.find_by_key("decrement"))
-    assert (await _find_text_when_ready(tester, "-1")).count == 1
+    await tester.pump_and_settle()
+    assert (await tester.find_by_text("-1")).count == 1