Unit Test in NestJs using Jest - unit-testing

Question

So, I want to test a Controller, but I always get the same error, and I not really familiarized with Jest.
I work with php and I already did some unit tests in phpUnit, but with Jest I'm really having some trouble to understand how to do.
Here is my error message
● Test suite failed to run
SyntaxError: /home/webjump-nb103/Projects/development/workspace/stare/customer/src/customer/customer.controller.spec.ts: Unexpected token, expected ";" (13:26)
11 |
12 | describe('Customer Controller', () => {
> 13 | let customerController: CustomerController;
| ^
14 | let customerService: CustomerService;
15 |
16 | beforeAll(async () => {
at Parser.raise (node_modules/#babel/parser/src/parser/location.js:41:63)
at Parser.unexpected (node_modules/#babel/parser/src/parser/util.js:150:16)
at Parser.semicolon (node_modules/#babel/parser/src/parser/util.js:123:40)
at Parser.parseVarStatement (node_modules/#babel/parser/src/parser/statement.js:703:10)
at Parser.parseStatementContent (node_modules/#babel/parser/src/parser/statement.js:216:21)
at Parser.parseStatement (node_modules/#babel/parser/src/parser/statement.js:146:17)
at Parser.parseBlockOrModuleBlockBody (node_modules/#babel/parser/src/parser/statement.js:865:25)
at Parser.parseBlockBody (node_modules/#babel/parser/src/parser/statement.js:841:10)
at Parser.parseBlock (node_modules/#babel/parser/src/parser/statement.js:818:10)
at Parser.parseFunctionBody (node_modules/#babel/parser/src/parser/expression.js:1964:24)
My controller
import {Controller, HttpStatus, Post, Res, Body, ValidationPipe, Put, Param, Get} from '#nestjs/common';
import {CreateCustomerDto} from './dto/customer/customer.dto';
import {CustomerService} from './customer.service';
#Controller('customer')
export class CustomerController {
constructor(private readonly customerService: CustomerService) { }
#Post()
async createPost(#Res() res, #Body(ValidationPipe) createCustomerDto: CreateCustomerDto ) {
const customer = await this.customerService.createCustomer(createCustomerDto);
return res.status(HttpStatus.OK).json({
customer: customer
});
}
#Put('update/:id')
async createUpdate(#Param('id') id: string, #Res() res, #Body(ValidationPipe) createCustomerDto: CreateCustomerDto) {
const customer = await this.customerService.updateCustomer(createCustomerDto, id);
return res.status(HttpStatus.OK).json({
customer: customer
});
}
}
**My Service **
import {Injectable} from '#nestjs/common';
import {Model} from 'mongoose';
import {InjectModel} from '#nestjs/mongoose';
import {Customer} from './interfaces/customer.interface';
import {CreateCustomerDto} from './dto/customer/customer.dto';
#Injectable()
export class CustomerService {
constructor(#InjectModel('customer') private readonly customerModel: Model<Customer>) {}
async createCustomer(createCustomerDto: CreateCustomerDto ): Promise<Customer> {
const customer = new this.customerModel(createCustomerDto);
return customer.save();
}
async updateCustomer(createCustomerDto: CreateCustomerDto, id: string): Promise<Customer> {
const customer = await this.customerModel
.findByIdAndUpdate(id, createCustomerDto, {new: true});
return customer;
}
}
And my test
import { Test, TestingModule } from '#nestjs/testing';
import { CustomerController } from './customer.controller';
import {CustomerService} from './customer.service';
import {CreateCustomerDto} from './dto/customer/customer.dto';
import {Customer} from './interfaces/customer.interface';
import {InjectModel} from '#nestjs/mongoose';
jest.mock('./customer.service.ts');
jest.mock('./customer.controller.ts');
jest.mock('./interfaces/customer.interface.ts');
describe('Customer Controller', () => {
let customerController: CustomerController;
let customerService: CustomerService;
beforeAll(async () => {
const module = await Test.createTestingModule({
controllers: [CustomerController],
providers: [CustomerService],
}).compile();
customerController = module.get(CustomerController);
customerService = module.get<CustomerService>(CustomerService);
});
describe('Create Post', () => {
const dto = new CreateCustomerDto();
const res = 200;
const customerModel: Customer;
it('should return an collection of customer when created ', async () => {
const expectedResult = new CustomerService(#InjectModel(customerModel<Customer>));
jest.spyOn(customerService, 'createCustomer').mockResolvedValue(customerModel);
expect(await customerController.createPost(res, dto)).toBe(expectedResult);
});
});
});
**Any thoughts ?**

Answer 1

As already mentioned in the comments, make sure you have your jest properly configured. Try to add/modify the following to your package.json
"jest": {
"moduleFileExtensions": [
"js",
"json",
"ts"
],
"rootDir": "src",
"testRegex": ".spec.ts$",
"transform": {
"^.+\\.(t|j)s$": "ts-jest"
},
"coverageDirectory": "../coverage",
"testEnvironment": "node"
}