Refactoring code for modular approach

tests/test_pagination.py

@@ -0,0 +1,56 @@
+# tests/test_pagination.py
+import pytest
+from models.database_models import Product
+
+
+class TestPagination:
+    def test_product_pagination(self, client, auth_headers, db):
+        """Test pagination for product listing"""
+        # Create multiple products
+        products = []
+        for i in range(25):
+            product = Product(
+                product_id=f"PAGE{i:03d}",
+                title=f"Pagination Test Product {i}",
+                marketplace="PaginationTest"
+            )
+            products.append(product)
+
+        db.add_all(products)
+        db.commit()
+
+        # Test first page
+        response = client.get("/api/v1/products?limit=10&skip=0", headers=auth_headers)
+        assert response.status_code == 200
+        data = response.json()
+        assert len(data["products"]) == 10
+        assert data["total"] == 25
+        assert data["skip"] == 0
+        assert data["limit"] == 10
+
+        # Test second page
+        response = client.get("/api/v1/products?limit=10&skip=10", headers=auth_headers)
+        assert response.status_code == 200
+        data = response.json()
+        assert len(data["products"]) == 10
+        assert data["skip"] == 10
+
+        # Test last page
+        response = client.get("/api/v1/products?limit=10&skip=20", headers=auth_headers)
+        assert response.status_code == 200
+        data = response.json()
+        assert len(data["products"]) == 5  # Only 5 remaining
+
+    def test_pagination_boundaries(self, client, auth_headers):
+        """Test pagination boundary conditions"""
+        # Test negative skip
+        response = client.get("/api/v1/products?skip=-1", headers=auth_headers)
+        assert response.status_code == 422  # Validation error
+
+        # Test zero limit
+        response = client.get("/api/v1/products?limit=0", headers=auth_headers)
+        assert response.status_code == 422  # Validation error
+
+        # Test excessive limit
+        response = client.get("/api/v1/products?limit=10000", headers=auth_headers)
+        assert response.status_code == 422  # Should be limited