test(e2e): in-place session-row finish swap

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

e2e/test_session_inplace_swap_e2e.py

@@ -0,0 +1,48 @@
+"""Browser test for the session-list "Finish session now" in-place row swap (issue #53).
+
+Drives the real session list against pytest-django's ``live_server``: clicks the
+finish button on a running session and asserts the row is updated in place via
+htmx (the row still exists and now shows an end-time em dash separator).
+"""
+
+import pytest
+from django.urls import reverse
+from django.utils import timezone
+from playwright.sync_api import Page, expect
+
+from games.models import Device, Game, Platform, Session
+
+
+@pytest.fixture
+def authenticated_page(live_server, page: Page, django_user_model) -> Page:
+    django_user_model.objects.create_user(username="tester", password="secret123")
+    page.goto(f"{live_server.url}{reverse('login')}")
+    page.fill('input[name="username"]', "tester")
+    page.fill('input[name="password"]', "secret123")
+    page.click('button:has-text("Login")')
+    page.wait_for_url(f"{live_server.url}/tracker**")
+    return page
+
+
+def test_finish_session_swaps_row_in_place(authenticated_page: Page, live_server):
+    page = authenticated_page
+    platform = Platform.objects.create(name="PC", icon="pc", group="PC")
+    game = Game.objects.create(name="Tunic", platform=platform)
+    device = Device.objects.create(name="Desktop")
+    session = Session.objects.create(
+        game=game, device=device, timestamp_start=timezone.now()
+    )
+
+    page.goto(f"{live_server.url}{reverse('games:list_sessions')}")
+
+    row = page.locator(f"#session-row-{session.pk}")
+    expect(row).to_be_visible()
+
+    row.locator('button[title="Finish session now"]').click()
+
+    # htmx swaps the row in place; the row still exists and now shows an end
+    # time separated by an em dash.
+    expect(row).to_contain_text("—")
+
+    session.refresh_from_db()
+    assert session.timestamp_end is not None