improve test for slack admin

Author: anujpundir999

backend/tests/apps/slack/admin/__init__.py

@@ -0,0 +1,69 @@
+from unittest.mock import MagicMock
+
+import pytest
+from django.contrib import messages
+from django.contrib.admin.sites import AdminSite
+
+from apps.slack.admin.member import MemberAdmin
+from apps.slack.models.member import Member
+
+
+@pytest.fixture
+def admin_instance():
+    return MemberAdmin(model=Member, admin_site=AdminSite())
+
+
+class TestMemberAdmin:
+    def test_approve_suggested_users_success(self, admin_instance):
+        request = MagicMock()
+        mock_suggested_user = MagicMock()
+        mock_member = MagicMock()
+
+        mock_member.suggested_users.all.return_value.count.return_value = 1
+        mock_member.suggested_users.all.return_value.first.return_value = mock_suggested_user
+
+        admin_instance.message_user = MagicMock()
+        queryset = [mock_member]
+
+        admin_instance.approve_suggested_users(request, queryset)
+
+        assert mock_member.user == mock_suggested_user
+        mock_member.save.assert_called_once()
+        admin_instance.message_user.assert_called_with(
+            request, pytest.approx(f" assigned user for {mock_member}."), messages.SUCCESS
+        )
+
+    def test_approve_suggested_users_multiple_error(self, admin_instance):
+        request = MagicMock()
+        mock_member = MagicMock()
+
+        mock_member.suggested_users.all.return_value.count.return_value = 2
+
+        admin_instance.message_user = MagicMock()
+        queryset = [mock_member]
+
+        admin_instance.approve_suggested_users(request, queryset)
+
+        mock_member.save.assert_not_called()
+        expected_message = (
+            f"Error: Multiple suggested users found for {mock_member}. "
+            f"Only one user can be assigned due to the one-to-one constraint."
+        )
+
+        admin_instance.message_user.assert_called_with(request, expected_message, messages.ERROR)
+
+    def test_approve_suggested_users_none_warning(self, admin_instance):
+        request = MagicMock()
+        mock_member = MagicMock()
+
+        mock_member.suggested_users.all.return_value.count.return_value = 0
+
+        admin_instance.message_user = MagicMock()
+        queryset = [mock_member]
+
+        admin_instance.approve_suggested_users(request, queryset)
+
+        mock_member.save.assert_not_called()
+        admin_instance.message_user.assert_called_with(
+            request, f"No suggested users found for {mock_member}.", messages.WARNING
+        )