Add tests for task view

todo/tests/unit/views/test_task.py

@@ -0,0 +1,60 @@
+from rest_framework.test import APISimpleTestCase, APIClient
+from rest_framework.reverse import reverse
+from rest_framework import status
+from unittest.mock import patch, Mock
+from rest_framework.response import Response
+from todo.constants.task import DEFAULT_PAGE_LIMIT
+from todo.dto.responses.get_tasks_response import GetTasksResponse
+from todo.tests.fixtures.task import task_dtos
+
+
+class TaskViewTests(APISimpleTestCase):
+    def setUp(self):
+        self.client = APIClient()
+        self.url = reverse("tasks")
+        self.valid_params = {"page": 1, "limit": 10}
+
+    @patch("todo.services.task_service.TaskService.get_tasks")
+    def test_get_tasks_returns_200_for_valid_params(self, mock_get_tasks: Mock):
+        mock_get_tasks.return_value = GetTasksResponse(tasks=task_dtos)
+
+        response: Response = self.client.get(self.url, self.valid_params)
+
+        mock_get_tasks.assert_called_once_with(1, 10)
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        expected_response = mock_get_tasks.return_value.model_dump(mode="json", exclude_none=True)
+        self.assertDictEqual(response.data, expected_response)
+
+    @patch("todo.services.task_service.TaskService.get_tasks")
+    def test_get_tasks_returns_200_without_params(self, mock_get_tasks: Mock):
+        mock_get_tasks.return_value = GetTasksResponse(tasks=task_dtos)
+
+        response: Response = self.client.get(self.url)
+        mock_get_tasks.assert_called_once_with(1, DEFAULT_PAGE_LIMIT)
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+
+    def test_get_tasks_returns_400_for_invalid_query_params(self):
+        invalid_params = {
+            "page": "invalid",
+            "limit": -1,
+        }
+
+        response: Response = self.client.get(self.url, invalid_params)
+
+        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
+        expected_response = {
+            "statusCode": 400,
+            "message": "Invalid request",
+            "errors": [
+                {"source": {"parameter": "page"}, "detail": "A valid integer is required."},
+                {"source": {"parameter": "limit"}, "detail": "limit must be greater than or equal to 1"},
+            ],
+        }
+        response_data = response.data
+
+        self.assertEqual(response_data["statusCode"], expected_response["statusCode"])
+        self.assertEqual(response_data["message"], expected_response["message"], "Error message mismatch")
+
+        for actual_error, expected_error in zip(response_data["errors"], expected_response["errors"]):
+            self.assertEqual(actual_error["source"]["parameter"], expected_error["source"]["parameter"])
+            self.assertEqual(actual_error["detail"], expected_error["detail"])