matchers.test.ts

describe('Matchers', () => {
  describe('Compare "toBe" to "toEqual"', () => {
    it('number', () => {
      expect(1 + 1).toBe(2) // ok
      expect(1 + 1).toEqual(2) // ok
    })
    it('string', () => {
      expect('d' + 'b').toBe('db') // ok
      expect('d' + 'b').toEqual('db') // ok
    })
    it('object', () => {
      const user = { name: 'Hoge', age: 30 }
      // expect(user).toBe({ name: 'Hoge', age: 30 }) // Fail
      expect(user).toEqual({ name: 'Hoge', age: 30 })
    })
    it('date', () => {
      const date = new Date('2020/01/01 00:00:00')
      // expect(date).toBe(new Date('2020/01/01 00:00:00')) // Fail
      expect(date).toEqual(new Date('2020/01/01 00:00:00'))
    })
    it('class', () => {
      class User {
        age: number
        constructor(age:number) {
          this.age = age
        }
      }
      const user = new User(30)
      // expect(user).toBe(new User(30)) // Fail
      expect(user).toEqual(new User(30))
    })
  })
})