Add end-to-end test for sign-in redirect behavior

tests/end_to_end/test_sign_in_flow.py

@@ -0,0 +1,15 @@
+import os
+import re
+from playwright.sync_api import expect
+from tests.end_to_end.conftest import check_axe_report
+
+E2E_TEST_URI = os.getenv("NOTIFY_E2E_TEST_URI")
+
+
+def test_sign_in_redirects_when_authenticated(authenticated_page):
+    page = authenticated_page
+    page.goto(f"{E2E_TEST_URI}/accounts")
+    page.wait_for_load_state("domcontentloaded")
+    check_axe_report(page)
+    expect(page).to_have_url(re.compile("/accounts"))
+    expect(page).to_have_title(re.compile("Choose service"))