DEVX-813: adding tests for InventoryUtil

Author: ShipilA

commercetools/commercetools-importapi-utils/src/test/resources/inventory.example.json

@@ -0,0 +1,17 @@
+{
+    "id": "inv-id-001",
+    "version": 1,
+    "key": "inventory-key",
+    "sku": "sku-001",
+    "quantityOnStock": 100,
+    "restockableInDays": 3,
+    "expectedDelivery": "2026-07-01T00:00:00.000Z",
+    "supplyChannel": {
+        "typeId": "channel",
+        "id": "channel-id-001",
+        "obj": { "id": "channel-id-001", "version": 1, "key": "channel-key",
+            "roles": [], "createdAt": "1970-01-01T00:00:00.001Z", "lastModifiedAt": "1970-01-01T00:00:00.001Z" }
+    },
+    "createdAt": "1970-01-01T00:00:00.001Z",
+    "lastModifiedAt": "1970-01-01T00:00:00.001Z"
+}

commercetools/commercetools-importapi-utils/src/test/resources/inventory.no-channel.json

@@ -0,0 +1,11 @@
+{
+    "id": "inv-id-001",
+    "version": 1,
+    "key": "inventory-key",
+    "sku": "sku-001",
+    "quantityOnStock": 100,
+    "restockableInDays": 3,
+    "expectedDelivery": "2026-07-01T00:00:00.000Z",
+    "createdAt": "1970-01-01T00:00:00.001Z",
+    "lastModifiedAt": "1970-01-01T00:00:00.001Z"
+}