Add integration test

Author: zichongkao

src/__tests__/areas.ts

@@ -45,6 +45,52 @@ describe('areas API', () => {
     await inMemoryDB.close()
   })
 
+  describe('mutations', () => {
+    it('updates sorting order and returns children in order', async () => {
+      const updateSortingOrderQuery = `
+        mutation ($input: [AreaSortingInput]) {
+          updateAreasSortingOrder(input: $input)
+        }
+      `
+      const updateResponse = await queryAPI({
+        query: updateSortingOrderQuery,
+        variables: { input: [
+          { areaId: wa.metadata.area_id, leftRightIndex: 3 }, 
+          { areaId: ca.metadata.area_id, leftRightIndex: 0 }, 
+        ]},
+        userUuid
+      })
+
+      expect(updateResponse.statusCode).toBe(200)
+      const sortingOrderResult = updateResponse.body.data.updateAreasSortingOrder
+      expect(sortingOrderResult).toHaveLength(2)
+
+      const areaChildrenQuery = `
+        query area($input: ID) {
+          area(uuid: $input) {
+            children {
+              uuid
+              metadata {
+                leftRightIndex
+              }
+            }
+          }
+        }
+      `
+
+      const areaChildrenResponse = await queryAPI({
+        query: areaChildrenQuery,
+        variables: { input: usa.metadata.area_id },
+        userUuid
+      })
+
+      expect(areaChildrenResponse.statusCode).toBe(200)
+      const areaResult = areaChildrenResponse.body.data.area
+      expect(areaResult.children[0]).toMatchObject({uuid: muuidToString(ca.metadata.area_id), metadata: { leftRightIndex: 0 }})
+      expect(areaResult.children[1]).toMatchObject({uuid: muuidToString(wa.metadata.area_id), metadata: { leftRightIndex: 3 }})
+    })
+  })
+
   describe('queries', () => {
     const areaQuery = `
       query area($input: ID) {