test: add item CRUD and validation tests

backend/tests/test_items.py

@@ -0,0 +1,165 @@
+import pytest
+from fastapi import status
+
+
+class TestItemCRUD:
+    """Test item creation, read, update, delete."""
+
+    def test_create_item(self, test_client, test_db):
+        """Test creating an inventory item."""
+        response = test_client.post(
+            "/api/items",
+            json={
+                "name": "Test Item",
+                "category": "Electronics",
+                "item_type": "Component",
+                "quantity": 10,
+                "barcode": "123456789",
+                "part_number": "PN-12345"
+            }
+        )
+        assert response.status_code == status.HTTP_201_CREATED
+        data = response.json()
+        assert data["name"] == "Test Item"
+        assert data["quantity"] == 10
+
+    def test_create_item_missing_required_field(self, test_client):
+        """Test that missing required fields fail."""
+        response = test_client.post(
+            "/api/items",
+            json={"name": "Test Item"}
+        )
+        assert response.status_code == status.HTTP_422_UNPROCESSABLE_ENTITY
+
+    def test_get_item_by_id(self, test_client, test_db):
+        """Test retrieving an item by ID."""
+        from backend.models import Item
+
+        item = Item(
+            name="Test Item",
+            category="Electronics",
+            item_type="Component",
+            quantity=10,
+            barcode="123456789",
+            part_number="PN-12345"
+        )
+        test_db.add(item)
+        test_db.commit()
+
+        response = test_client.get(f"/api/items/{item.id}")
+        assert response.status_code == status.HTTP_200_OK
+        data = response.json()
+        assert data["name"] == "Test Item"
+        assert data["barcode"] == "123456789"
+
+    def test_list_items(self, test_client, test_db):
+        """Test listing all items."""
+        from backend.models import Item
+
+        item1 = Item(name="Item1", category="A", item_type="Type", quantity=5, barcode="111", part_number="PN1")
+        item2 = Item(name="Item2", category="B", item_type="Type", quantity=3, barcode="222", part_number="PN2")
+        test_db.add_all([item1, item2])
+        test_db.commit()
+
+        response = test_client.get("/api/items")
+        assert response.status_code == status.HTTP_200_OK
+        data = response.json()
+        assert len(data) >= 2
+
+    def test_update_item(self, test_client, test_db):
+        """Test updating an item."""
+        from backend.models import Item
+
+        item = Item(
+            name="Test Item",
+            category="Electronics",
+            item_type="Component",
+            quantity=10,
+            barcode="123456789",
+            part_number="PN-12345"
+        )
+        test_db.add(item)
+        test_db.commit()
+
+        response = test_client.put(
+            f"/api/items/{item.id}",
+            json={"quantity": 20, "part_number": "PN-99999"}
+        )
+        assert response.status_code == status.HTTP_200_OK
+        data = response.json()
+        assert data["quantity"] == 20
+        assert data["part_number"] == "PN-99999"
+
+    def test_delete_item_admin_only(self, test_client, test_db, admin_token):
+        """Test deleting an item (admin only)."""
+        from backend.models import Item
+
+        item = Item(
+            name="Test Item",
+            category="Electronics",
+            item_type="Component",
+            quantity=10,
+            barcode="123456789",
+            part_number="PN-12345"
+        )
+        test_db.add(item)
+        test_db.commit()
+        item_id = item.id
+
+        response = test_client.delete(
+            f"/api/items/{item_id}",
+            headers={"Authorization": f"Bearer {admin_token}"}
+        )
+        assert response.status_code == status.HTTP_204_NO_CONTENT
+
+        # Verify audit log persists
+        response = test_client.get(f"/api/audit-logs?item_id={item_id}")
+        assert response.status_code == status.HTTP_200_OK
+
+
+class TestItemValidation:
+    """Test item field validation."""
+
+    def test_barcode_unique(self, test_client, test_db):
+        """Test that barcodes must be unique."""
+        from backend.models import Item
+
+        item1 = Item(
+            name="Item1",
+            category="A",
+            item_type="Type",
+            quantity=5,
+            barcode="UNIQUE123",
+            part_number="PN1"
+        )
+        test_db.add(item1)
+        test_db.commit()
+
+        # Try to create duplicate barcode
+        response = test_client.post(
+            "/api/items",
+            json={
+                "name": "Item2",
+                "category": "B",
+                "item_type": "Type",
+                "quantity": 5,
+                "barcode": "UNIQUE123",
+                "part_number": "PN2"
+            }
+        )
+        assert response.status_code == status.HTTP_409_CONFLICT
+
+    def test_quantity_non_negative(self, test_client):
+        """Test that quantity must be non-negative."""
+        response = test_client.post(
+            "/api/items",
+            json={
+                "name": "Test",
+                "category": "A",
+                "item_type": "Type",
+                "quantity": -5,
+                "barcode": "123",
+                "part_number": "PN"
+            }
+        )
+        assert response.status_code == status.HTTP_422_UNPROCESSABLE_ENTITY