Fix tests with playwright

Basically:
- when using playwright, we use live_server
- live_server make django-pytest switch in "transactional db" mode
- when in this mode, it will reset all data of all tables in db
- we relied on data created during the migrations, so only available
  for first test run

umap/tests/conftest.py

@@ -5,8 +5,13 @@ import pytest
 from django.core.cache import cache
 from django.core.signing import get_cookie_signer
 
-from .base import DataLayerFactory, MapFactory, UserFactory
-from umap.models import Licence, TileLayer
+from .base import (
+    DataLayerFactory,
+    MapFactory,
+    UserFactory,
+    TileLayerFactory,
+    LicenceFactory,
+)
 
 TMP_ROOT = tempfile.mkdtemp()
 
@@ -37,8 +42,7 @@ def user2():
 
 @pytest.fixture
 def licence():
-    # Should be created by the migrations.
-    return Licence.objects.last()
+    return LicenceFactory()
 
 
 @pytest.fixture
@@ -73,4 +77,4 @@ def datalayer(map):
 
 @pytest.fixture
 def tilelayer():
-    return TileLayer.objects.last()
+    return TileLayerFactory()

umap/tests/integration/test_basics.py

@@ -18,7 +18,7 @@ def test_create_map_link(page, live_server, lang, link_name, link_url):
     expect(create_map_button).to_have_attribute("href", link_url)
 
 
-def test_create_map_with_cursor(page, live_server):
+def test_create_map_with_cursor(page, live_server, tilelayer):
     page.goto(f"{live_server.url}/en/map/new/")
 
     # Click on the Draw a marker button on a new map.