calculator.test.js

const { TestWatcher } = require('jest');
const mathOperations = require('./calculator');

describe("Calculator tests", () => {
    var input1 = 0
    var input2 = 0
    
    beforeAll(() => {
      console.log("beforeAll called");
    });
    
    afterAll(() => {
      console.log("afterAll called");
    });
     beforeEach(() => {
      console.log("beforeEach called");
      input1 = 1;
      input2 = 2;
    });
     afterEach(() => {
      console.log("afterEach called");
    });
    
    test('adding 1 + 2 should return 3', () => {
      // arrange and act
      var result = mathOperations.sum(1,2)
    
      // assert
      expect(result).toBe(3);
    });
    
    test("subtracting 2 from 10 should return 8", () => {
      // arrange and act
      var result = mathOperations.diff(10,2)
    
      // assert
      expect(result).toBe(8);
    });
    
    test("multiplying 2 and 8 should return 16", () => {
      // arrange and act
      var result = mathOperations.product(2,8)
    
      // assert
      expect(result).toBe(16);
    });
   })