added superuser support in apps.lyric.admin & new manage.py cmd ensure_superuser; .tests.integrated.test_admin & .test_management_commands green

src/apps/lyric/tests/integrated/test_admin.py

@@ -0,0 +1,25 @@
+from django.test import TestCase
+
+from apps.lyric.models import User
+
+
+class UserAdminTest(TestCase):
+    def setUp(self):
+        self.superuser = User.objects.create_superuser(
+            email="admin@example.com", password="secret"
+        )
+        self.client.force_login(self.superuser)
+
+    def test_user_changelist_loads(self):
+        response = self.client.get("/admin/lyric/user/")
+        self.assertEqual(response.status_code, 200)
+
+    def test_user_changelist_displays_email(self):
+        response = self.client.get("/admin/lyric/user/")
+        self.assertContains(response, "admin@example.com")
+
+    def test_user_changelist_search_by_email(self):
+        User.objects.create_superuser(email="other@example.com", password="x")
+        response = self.client.get("/admin/lyric/user/?q=admin")
+        self.assertContains(response, "admin@example.com")
+        self.assertNotContains(response, "other@example.com")