SnackBar basic test

Author: InesaFitsner

sdk/python/packages/flet/integration_tests/controls/golden/macos/snack_bar/snack_bar_basic.png

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+import pytest
+
+import flet as ft
+import flet.testing as ftt
+
+
+@pytest.mark.asyncio(loop_scope="module")
+async def test_snack_bar_basic(flet_app: ftt.FletTestApp, request):
+    flet_app.page.theme_mode = ft.ThemeMode.LIGHT
+    flet_app.page.enable_screenshots = True
+    flet_app.page.window.width = 400
+    flet_app.page.window.height = 600
+    flet_app.page.show_dialog(ft.SnackBar(ft.Text("Hello, world!")))
+    flet_app.page.update()
+    await flet_app.tester.pump_and_settle()
+
+    flet_app.assert_screenshot(
+        "snack_bar_basic",
+        await flet_app.page.take_screenshot(
+            pixel_ratio=flet_app.screenshots_pixel_ratio
+        ),
+    )