diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 54a973cb..a5f4c41b 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -12,21 +12,28 @@ stages:
 - deploy
 - release
 
-qgis-server:
+.tests:
+  image: ${REGISTRY_URL}/factory-ci-runner:qgis-${QGIS_FLAVOR}
   stage: test
+  script:
+    - source ~/.bashrc
+    - make install-tests FLAVOR=$QGIS_FLAVOR
+    - pip list -l
+    - make test FLAVOR=$QGIS_FLAVOR
+  tags:
+    - factory
+
+
+qgis-server:
+  extends: .tests
   parallel:
     matrix:
-      - QGIS_VERSION: [
-        "3.16",
+      - QGIS_FLAVOR: [
         "3.22",
         "3.28",
         "3.34",
         "nightly-release",
       ]
-  script:
-    - make tests FLAVOR=${QGIS_VERSION}
-  tags:
-    - infrav3
 
 linter:
   image: ${REGISTRY_URL}/factory-ci-runner:qgis-ltr
diff --git a/lizmap_server/tooltip.py b/lizmap_server/tooltip.py
index ffb0339f..04511f27 100755
--- a/lizmap_server/tooltip.py
+++ b/lizmap_server/tooltip.py
@@ -82,7 +82,7 @@ def create_popup_node_item_from_form(
             alias = field.alias()
             name = field.name()
             fname = alias if alias else name
-            fname = fname.replace("'", "’")  # noqa RUF001
+            fname = fname.replace("'", "’")
 
             # adapt the view depending on the field type
             field_widget_setup = field.editorWidgetSetup()
diff --git a/requirements/dev.txt b/requirements/dev.txt
index 863b4337..a2076ba0 100644
--- a/requirements/dev.txt
+++ b/requirements/dev.txt
@@ -4,3 +4,4 @@ mypy
 mypy-extensions
 pipdeptree
 xmldiff
+Pillow
diff --git a/setup.cfg b/setup.cfg
index efb2e711..3acb49c6 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -29,16 +29,16 @@
 ;     .local/lib,
 ;     ./test/.local/lib
 ;
-; [isort]
-; multi_line_output = 3
-; include_trailing_comma = True
-; use_parentheses = True
-; ensure_newline_before_comments = True
-; lines_between_types = 1
-; skip =
-;     .venv,
-;     .local/,
-;     .cache/,
+[isort]
+multi_line_output = 3
+include_trailing_comma = True
+use_parentheses = True
+ensure_newline_before_comments = True
+lines_between_types = 1
+skip =
+    .venv,
+    .local/,
+    .cache/,
 
 [qgis-plugin-ci]
 plugin_path = lizmap_server
diff --git a/test/conftest.py b/test/conftest.py
index 5ce62555..883a0c75 100644
--- a/test/conftest.py
+++ b/test/conftest.py
@@ -5,22 +5,22 @@
 import sys
 import warnings
 
-import lxml.etree
-import pytest
-
-from qgis.PyQt import Qt
-
 from typing import Any, Dict, Generator, Optional
 
+import pytest
+
 from qgis.core import Qgis, QgsApplication, QgsFontUtils, QgsProject
+from qgis.PyQt import Qt
 from qgis.server import (
     QgsBufferServerRequest,
     QgsBufferServerResponse,
     QgsServer,
-    QgsServerRequest,
     QgsServerInterface,
+    QgsServerRequest,
 )
 
+from .utils import OWSResponse
+
 with warnings.catch_warnings():
     warnings.filterwarnings("ignore", category=DeprecationWarning)
     from osgeo import gdal
@@ -82,50 +82,6 @@ def pytest_sessionstart(session):
 #     del qgis_application
 
 
-NAMESPACES = {
-    'xlink': "http://www.w3.org/1999/xlink",
-    'wms': "http://www.opengis.net/wms",
-    'wfs': "http://www.opengis.net/wfs",
-    'wcs': "http://www.opengis.net/wcs",
-    'ows': "http://www.opengis.net/ows/1.1",
-    'gml': "http://www.opengis.net/gml",
-    'xsi': "http://www.w3.org/2001/XMLSchema-instance",
-}
-
-
-class OWSResponse:
-
-    def __init__(self, resp: QgsBufferServerResponse) -> None:
-        self._resp = resp
-        self._xml = None
-
-    @property
-    def xml(self) -> 'xml':
-        if self._xml is None and self._resp.headers().get('Content-Type','').find('text/xml')==0:
-            self._xml = lxml.etree.fromstring(self.content)
-        return self._xml
-
-    @property
-    def content(self) -> bytes:
-        return bytes(self._resp.body())
-
-    @property
-    def status_code(self) -> int:
-        return self._resp.statusCode()
-
-    @property
-    def headers(self) -> Dict[str,str]:
-        return self._resp.headers()
-
-    def xpath(self, path: str) -> lxml.etree.Element:
-        assert self.xml is not None
-        return self.xml.xpath(path, namespaces=NAMESPACES)
-
-    def xpath_text(self, path: str) -> str:
-        assert self.xml is not None
-        return ' '.join(e.text for e in self.xpath(path))
-
-
 @pytest.fixture(scope='session')
 def client(request):
     """ Return a qgis server instance
@@ -163,7 +119,12 @@ def get_project(self, name: str) -> QgsProject:
                 raise ValueError("Error reading project '%s':" % projectpath.strpath)
             return qgsproject
 
-        def get(self, query: str, project: Optional[str] = None, headers: Optional[Dict[str, str]] = None) -> OWSResponse:
+        def get(
+                self,
+                query: str,
+                project: Optional[str] = None,
+                headers: Optional[Dict[str, str]] = None,
+            ) -> OWSResponse:
             """ Return server response from query
             """
             if headers is None:
@@ -177,7 +138,11 @@ def get(self, query: str, project: Optional[str] = None, headers: Optional[Dict[
             self.server.handleRequest(server_request, response, project=qgsproject)
             return OWSResponse(response)
 
-        def get_with_project(self, query: str, project: QgsProject, headers: Optional[Dict[str, str]] = None) -> OWSResponse:
+        def get_with_project(
+            self, query: str,
+            project: QgsProject,
+            headers: Optional[Dict[str, str]] = None,
+        ) -> OWSResponse:
             """ Return server response from query
             """
             if headers is None:
diff --git a/test/utils.py b/test/utils.py
index 25be92d3..6eb40fca 100644
--- a/test/utils.py
+++ b/test/utils.py
@@ -2,12 +2,60 @@
 import json
 import xml.etree.ElementTree as ET
 
+from typing import Dict, Union
+
+import lxml.etree
+
 from PIL import Image
+from qgis.server import QgsBufferServerResponse
 
 __copyright__ = 'Copyright 2024, 3Liz'
 __license__ = 'GPL version 3'
 __email__ = 'info@3liz.org'
 
+NAMESPACES = {
+    'xlink': "http://www.w3.org/1999/xlink",
+    'wms': "http://www.opengis.net/wms",
+    'wfs': "http://www.opengis.net/wfs",
+    'wcs': "http://www.opengis.net/wcs",
+    'ows': "http://www.opengis.net/ows/1.1",
+    'gml': "http://www.opengis.net/gml",
+    'xsi': "http://www.w3.org/2001/XMLSchema-instance",
+}
+
+
+class OWSResponse:
+
+    def __init__(self, resp: QgsBufferServerResponse) -> None:
+        self._resp = resp
+        self._xml = None
+
+    @property
+    def xml(self) -> 'xml':
+        if self._xml is None and self._resp.headers().get('Content-Type', '').find('text/xml') == 0:
+            self._xml = lxml.etree.fromstring(self.content)
+        return self._xml
+
+    @property
+    def content(self) -> bytes:
+        return bytes(self._resp.body())
+
+    @property
+    def status_code(self) -> int:
+        return self._resp.statusCode()
+
+    @property
+    def headers(self) -> Dict[str, str]:
+        return self._resp.headers()
+
+    def xpath(self, path: str) -> lxml.etree.Element:
+        assert self.xml is not None
+        return self.xml.xpath(path, namespaces=NAMESPACES)
+
+    def xpath_text(self, path: str) -> str:
+        assert self.xml is not None
+        return ' '.join(e.text for e in self.xpath(path))
+
 
 def _build_query_string(params: dict) -> str:
     """ Build a query parameter from a dictionary. """
@@ -17,7 +65,9 @@ def _build_query_string(params: dict) -> str:
     return query_string
 
 
-def _check_request(result, content_type: str = 'application/json', http_code: int = 200): # noqa ANN401
+def _check_request(
+        result: OWSResponse, content_type: str = 'application/json', http_code: int = 200,
+) -> Union[dict, ET.Element, Image.Image]:
     """ Check the output and return the content. """
     assert result.status_code == http_code, f'HTTP code {result.status_code}, expected {http_code}'
     assert result.headers.get('Content-Type', '').lower().find(content_type) == 0, f'Headers {result.headers}'