I’m trying to write tests for the CreateVendor function using Jest and Supertest. I’m stuck on how to mock the dependencies (generateSalt, hashPassword) to properly test the function’s behavior. I’m getting this error: “Property generateSalt does not exist in the provided object.

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Controller function

export const CreateVendor = async (req: Request, res: Response, next: NextFunction) => {
    const { address, email, foodType, name, ownerName, password, phone, pincode } = <CreateVendorInput>req.body
    try {
        const findOne = await findVendor('', email)
        if (!findOne) {
            const bcryptSalt = await generateSalt()
            const bcryptPassword = await hashPassword(password, bcryptSalt)
            const CreateVendor = await Vendor.create({
                name: name,
                email: email,
                address: address,
                foodType: foodType,
                ownerName: ownerName,
                password: bcryptPassword,
                phone: phone,
                pincode: pincode,
                salt: bcryptSalt,
                rating: 0,
                serviceAvailable: false,
                coverImage: [],
            })
            return res.status(201).json({ "success": CreateVendor })
        } else {
            throw new BadRequestError('Vendor Already Exists', 'Admin/CreateVendor')
        }
    } catch (err) {
        next(err)
    }
}

Test file

it('creates a new vendor successfully', async () => {
            //@ts-ignore
            const mockVendorData: CreateVendorInput = test_data.vendor
            // const mockSalt = jest.fn().mockReturnValue('mockedSalt'); // Replace with a sample salt string
            // const mockHashedPassword = jest.fn().mockResolvedValue('hashedPassword123');

            //@ts-ignore
            jest.spyOn(Vendor, 'create').mockResolvedValueOnce(mockVendorData)
            //@ts-ignore
            jest.spyOn(Vendor, 'find').mockResolvedValueOnce(null)
            // jest.mocked(generateSalt).mockImplementation(mockSalt);
            // jest.mocked(hashPassword).mockImplementation(mockHashedPassword);


            const res = await supertest(app)
                .post('/admin/vendor') // Adjust path if necessary
                .send(mockVendorData)
                .expect(201); // Expect successful creation status code
            console.log(res.body)
            expect(res.body.success).toHaveProperty('name', mockVendorData.name); // Check name in response
            expect(res.body.success).toHaveProperty('email', mockVendorData.email);
        }, 50000);

Error

CreateVendor function
    × creates a new vendor successfully (10063 ms)

  ● CreateVendor function › creates a new vendor successfully

    expected 201 "Created", got 404 "Not Found"

      91 |                 .post('/admin/vendor') // Adjust path if necessary
      92 |                 .send(mockVendorData)
    > 93 |                 .expect(201); // Expect successful creation status code
         |                  ^
      94 |             console.log(res.body)
      95 |             expect(res.body.success).toHaveProperty('name', mockVendorData.name); // Check name in response
      96 |             expect(res.body.success).toHaveProperty('email', mockVendorData.email);

      at source/__test__/controllers/AdminController.test.ts:93:18
      at source/__test__/controllers/AdminController.test.ts:8:71
      at Object.<anonymous>.__awaiter (source/__test__/controllers/AdminController.test.ts:4:12)
      at Object.<anonymous> (source/__test__/controllers/AdminController.test.ts:76:60)
      ----
      at Test._assertStatus (node_modules/supertest/lib/test.js:252:14)
      at node_modules/supertest/lib/test.js:308:13
      at Test._assertFunction (node_modules/supertest/lib/test.js:285:13)
      at Test.assert (node_modules/supertest/lib/test.js:164:23)
      at Server.localAssert (node_modules/supertest/lib/test.js:120:14)

I tried importing the generateSalt function from the ../../utilities.js file and using jest.spyOn to mock it. I provided a mock implementation that always returns a string value for the salt.

I expected the test to pass and the mocked generateSalt function to be called once during the execution of the CreateVendor function. However, the test fails.