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断言 ​

  • describe : 表示一组分组，测试套件
  • test : 定义单个的用例，测试用例
  • it : test 的别名

一个 describe 可以包含多组 test 。

常见断言场景 ​

场景方向涉及的断言 API
基础类型的比较not toBe(value) toBeTruthy(value) toBeFalsy(value) toBeDefined() toBeUndefined() toBeCloseTo(value) toBeNaN()
引用类型的比较toEqual(value)
数字符号toBeGreaterThan(value) toBeLessThan(value) toBeGreaterThanOrEqual(value) toBeLessThanOrEqual(value)
正则匹配toMatch(value) toMatchObject(value)
表单验证toContain(value) arrayContaining(value) toContainEqual(value) toHaveLength(value) toHaveProperty(value)
错误抛出toThrow() toThrowError()

基础类型 ​

ts
describe("assertion", () => {
  test("primitive", () => {
    expect(1 + 1).toBe(2)
    expect(1 + 1).not.toBe(3)

    expect(true).toBe(true)
    expect(true).toBeTruthy()
    expect(false).toBeFalsy()

    expect(undefined).toBe(undefined)
    expect(undefined).not.toBeDefined()
    expect(undefined).toBeUndefined()

    const returnUndefined = () => {}
    expect(returnUndefined()).toBeUndefined()

    expect(0.2 + 0.1).not.toBe(0.3)
    expect(0.2 + 0.1).toBeCloseTo(0.3)

    expect(Number.NaN).toBeNaN()
    expect(Number.NaN).toBe(Number.NaN)

    expect(+0).not.toBe(-0)
  })
})
describe("assertion", () => {
  test("primitive", () => {
    expect(1 + 1).toBe(2)
    expect(1 + 1).not.toBe(3)

    expect(true).toBe(true)
    expect(true).toBeTruthy()
    expect(false).toBeFalsy()

    expect(undefined).toBe(undefined)
    expect(undefined).not.toBeDefined()
    expect(undefined).toBeUndefined()

    const returnUndefined = () => {}
    expect(returnUndefined()).toBeUndefined()

    expect(0.2 + 0.1).not.toBe(0.3)
    expect(0.2 + 0.1).toBeCloseTo(0.3)

    expect(Number.NaN).toBeNaN()
    expect(Number.NaN).toBe(Number.NaN)

    expect(+0).not.toBe(-0)
  })
})