diff --git a/.github/workflows/test-package.yml b/.github/workflows/test-package.yml
index 2e454c2..191b907 100644
--- a/.github/workflows/test-package.yml
+++ b/.github/workflows/test-package.yml
@@ -106,7 +106,7 @@ jobs:
       env:
         DATABASE_ENGINE: ${{ matrix.database }}
       run: |
-        coverage run --append --source=admin_interface setup.py test
+        coverage run --append --source=admin_interface runtests.py
         coverage xml -o ./coverage.xml
 
     - name: Upload coverage to Codecov
diff --git a/admin_interface/static/admin_interface/magnific-popup/jquery.magnific-popup.js b/admin_interface/static/admin_interface/magnific-popup/jquery.magnific-popup.js
index f06f96d..2d4a921 100755
--- a/admin_interface/static/admin_interface/magnific-popup/jquery.magnific-popup.js
+++ b/admin_interface/static/admin_interface/magnific-popup/jquery.magnific-popup.js
@@ -1808,7 +1808,7 @@
                 _mfpTrigger('LazyLoad', item);
 
                 if(item.type === 'image') {
-                    item.img = $('<img class="mfp-img" />').on('load.mfploader', function() {
+                    item.img = $('<img class="mfp-img">').on('load.mfploader', function() {
                         item.hasSize = true;
                     }).on('error.mfploader', function() {
                         item.hasSize = true;
@@ -1864,4 +1864,4 @@
 
     /*>>retina*/
     _checkInstance();
-}));
\ No newline at end of file
+}));
diff --git a/admin_interface/templates/admin/base_site.html b/admin_interface/templates/admin/base_site.html
index 9c8fb8c..b6595ca 100644
--- a/admin_interface/templates/admin/base_site.html
+++ b/admin_interface/templates/admin/base_site.html
@@ -92,33 +92,33 @@
           href="{% static 'admin_interface/css/rangefilter.css' %}?v={{ version_md5_cache }}">
     {% if not theme.recent_actions_visible %}
     <link rel="stylesheet" type="text/css"
-          href="{% static 'admin_interface/css/recent-actions.css' %}?v={{ version_md5_cache }}"/>
+          href="{% static 'admin_interface/css/recent-actions.css' %}?v={{ version_md5_cache }}">
     {% endif %}
     <link rel="stylesheet" type="text/css"
-          href="{% static 'admin_interface/css/related-modal.css' %}?v={{ version_md5_cache }}"/>
+          href="{% static 'admin_interface/css/related-modal.css' %}?v={{ version_md5_cache }}">
     <link rel="stylesheet" type="text/css"
-          href="{% static 'admin_interface/css/streamfield.css' %}?v={{ version_md5_cache }}"/>
+          href="{% static 'admin_interface/css/streamfield.css' %}?v={{ version_md5_cache }}">
     <link rel="stylesheet" type="text/css"
-          href="{% static 'admin_interface/css/jquery.ui.tabs.css' %}?v={{ version_md5_cache }}"/>
+          href="{% static 'admin_interface/css/jquery.ui.tabs.css' %}?v={{ version_md5_cache }}">
     <link rel="stylesheet" type="text/css"
-          href="{% static 'admin_interface/css/modeltranslation.css' %}?v={{ version_md5_cache }}"/>
+          href="{% static 'admin_interface/css/modeltranslation.css' %}?v={{ version_md5_cache }}">
     <link rel="stylesheet" type="text/css"
-          href="{% static 'admin_interface/css/sorl-thumbnail.css' %}?v={{ version_md5_cache }}"/>
+          href="{% static 'admin_interface/css/sorl-thumbnail.css' %}?v={{ version_md5_cache }}">
     <link rel="stylesheet" type="text/css"
-          href="{% static 'admin_interface/css/ckeditor.css' %}?v={{ version_md5_cache }}"/>
+          href="{% static 'admin_interface/css/ckeditor.css' %}?v={{ version_md5_cache }}">
     <link rel="stylesheet" type="text/css"
-          href="{% static 'admin_interface/css/tinymce.css' %}?v={{ version_md5_cache }}"/>
+          href="{% static 'admin_interface/css/tinymce.css' %}?v={{ version_md5_cache }}">
     <link rel="stylesheet" type="text/css"
-          href="{% static 'admin_interface/css/json-widget.css' %}?v={{ version_md5_cache }}"/>
+          href="{% static 'admin_interface/css/json-widget.css' %}?v={{ version_md5_cache }}">
     <link rel="stylesheet" type="text/css"
-          href="{% static 'admin_interface/css/import-export.css' %}?v={{ version_md5_cache }}"/>
+          href="{% static 'admin_interface/css/import-export.css' %}?v={{ version_md5_cache }}">
     <link rel="stylesheet" type="text/css"
-          href="{% static 'admin_interface/css/rtl.css' %}?v={{ version_md5_cache }}"/>
+          href="{% static 'admin_interface/css/rtl.css' %}?v={{ version_md5_cache }}">
     <link rel="stylesheet" type="text/css"
           href="{% static 'admin_interface/css/tabbed-changeform.css' %}?v={{ version_md5_cache }}">
 
 {% if current_lang == 'fa' %}
-<link rel="stylesheet" type="text/css" href="https://cdn.jsdelivr.net/gh/rastikerdar/vazir-font@v27.2.2/dist/font-face.css" />
+<link rel="stylesheet" type="text/css" href="https://cdn.jsdelivr.net/gh/rastikerdar/vazir-font@v27.2.2/dist/font-face.css">
 {% endif %}
 
 {% endblock %}
diff --git a/runtests.py b/runtests.py
index 9c83e95..06e1173 100755
--- a/runtests.py
+++ b/runtests.py
@@ -12,8 +12,9 @@ def runtests():
     TestRunner = get_runner(settings)
     test_runner = TestRunner()
     failures = test_runner.run_tests(["tests"])
-    sys.exit(bool(failures))
+    return failures
 
 
 if __name__ == "__main__":
-    runtests()
+    failures = runtests()
+    sys.exit(bool(failures))
diff --git a/setup.py b/setup.py
index 738a6a2..3364db4 100644
--- a/setup.py
+++ b/setup.py
@@ -80,5 +80,4 @@ setup(
         "Programming Language :: Python :: 3.11",
         "Topic :: Software Development :: Build Tools",
     ],
-    test_suite="runtests.runtests",
 )
diff --git a/tests/test_models.py b/tests/test_models.py
index de12268..1b3a5a4 100644
--- a/tests/test_models.py
+++ b/tests/test_models.py
@@ -89,7 +89,7 @@ class AdminInterfaceModelsTestCase(TestCase):
 
     def test_str(self):
         theme = Theme.get_active_theme()
-        self.assertEqual(f"{theme}", "Django")
+        self.assertEqual(str(theme), "Django")
 
 
 # class AdminInterfaceModelsMultiDBTestCase(TestCase):
diff --git a/tox.ini b/tox.ini
index 2471ec1..bbca603 100644
--- a/tox.ini
+++ b/tox.ini
@@ -13,7 +13,6 @@ python =
     3.11: py311
 
 [testenv]
-passenv = CI,GITHUB_WORKFLOW
 deps =
     dj22: Django == 2.2.*
     dj30: Django == 3.0.*
@@ -30,7 +29,7 @@ setenv =
     # mysql: DATABASE_ENGINE=mysql
     postgres: DATABASE_ENGINE=postgres
 commands =
-    coverage run --append --source=admin_interface setup.py test
+    coverage run --append --source=admin_interface runtests.py
     coverage report -m
     codecov