starting to add parcel service and unit test

express-api/src/services/parcels/parcelServices.ts

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+import { Parcel } from "@/typeorm/Entities/Parcel";
+import { AppDataSource } from "@/appDataSource";
+import { ErrorWithCode } from "@/utilities/customErrors/ErrorWithCode";
+
+const parcelRepo = AppDataSource.getRepository(Parcel);
+
+/**
+ * @description          Adds a new parcel to the datasource.
+ * @param   parcel       incoming parcel data to be added to the database
+ * @returns {Response}   A 201 status and the data of the role added.
+ * @throws ErrorWithCode If the parcel already exists or is unable to be added. 
+ */
+export const postParcel = async (parcel: Parcel) => {
+    const existingParcel = await getParcelById(parcel.Id);
+    if (existingParcel) {
+        throw new ErrorWithCode('Parcel already exists', 409);
+    };
+    const newParcel = parcelRepo.save(parcel);
+    return newParcel;
+};
+
+/**
+ * @description Finds and returns a parcel with matching Id 
+ * @param       parcelId Number representing parcel we want to find.
+ * @returns     findParcel Parcel data matching Id passed in. 
+ */
+export const getParcelById = async (parcelId: number) => {
+    try{
+        const findParcel = await parcelRepo.findOne({
+            where: { Id: parcelId},
+        });
+        return findParcel;
+    } catch (e) {
+        throw new ErrorWithCode(e.message, e.status);
+    }
+}

express-api/tests/unit/services/parcels/parcelsService.test.ts

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+import { AppDataSource } from "@/appDataSource";
+import { Parcel } from "@/typeorm/Entities/Parcel";
+import { DeepPartial } from "typeorm";
+
+const parcelRepo = AppDataSource.getRepository(Parcel);
+
+const _parcelSave = jest
+  .spyOn(parcelRepo, 'save')
+  .mockImplementation(async (parcel: DeepPartial<Parcel> & Parcel) => parcel);
+
+  describe('UNIT - Parcel Services', () => {
+    describe('addParcel', () => {
+        it('should add a new parcel and return it', async () => {
+
+        })
+    })
+  })