CupertinoButton basic test

Author: InesaFitsner

sdk/python/packages/flet/integration_tests/controls/golden/macos/cupertino_button/cupertino_button_basic.png

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+import flet as ft
+import flet.testing as ftt
+import pytest
+
+
+@pytest.mark.asyncio(loop_scope="module")
+async def test_cupertino_button_basic(flet_app: ftt.FletTestApp, request):
+    flet_app.page.theme_mode = ft.ThemeMode.LIGHT
+    await flet_app.assert_control_screenshot(
+        request.node.name,
+        ft.CupertinoButton("Click me"),
+    )