#555 item model back unit test

services/loopback/common/models/item.js

@@ -26,6 +26,7 @@ module.exports = Self => {
                 let newId = await Self.rawSql(query);
 
                 ctx.instance.id = newId[0].id;
+                return ctx.instance.id;
             } catch (e) {
                 throw new UserError(e);
             }

services/loopback/common/models/specs/item.spec.js

@@ -0,0 +1,22 @@
+const app = require(`${servicesDir}/ticket/server/server`);
+
+describe('loopback model Item', () => {
+    describe('availableId()', () => {
+        let nextItemId;
+        beforeEach(async() => {
+            let query = `SELECT i1.id + 1 as id FROM vn.item i1
+            LEFT JOIN vn.item i2 ON i1.id + 1 = i2.id
+            WHERE i2.id IS NULL ORDER BY i1.id LIMIT 1`;
+
+            [nextAvailableId] = await app.models.Item.rawSql(query);
+            nextItemId = nextAvailableId.id;
+        });
+
+        it('should return the next available id for an item', async() => {
+            let context = {isNewInstance: true, instance: {}};
+            let result = await app.models.Item.availableId(context);
+
+            expect(result).toEqual(nextItemId);
+        });
+    });
+});