BDD 断言

建议

使用 BDD 风格的断言, 也就是使用人类的自然语言(英语)来描述你的期望, 比如:

describe("筛选功能 - Filter Function", () => {
  it("如果数组是 [1, 2, 3], 则返回 [1, 2]", () => {
    expect(filter([1, 2, 3]))
      .to.include.members([1, 2])
      .but.not.include.members([3]);
  });
});

转化成自然语言就是: expect filter([1, 2, 3]) to include members [1, 2] but not include members [3]

否则

使用非 BDD 风格的断言, 必须浏览冗长复杂的代码, 加大理解成本, 比如:

describe("筛选功能 - Filter Function", () => {
  it("如果数组是 [1, 2, 3], 则返回 [1, 2]", () => {
    const result = filter([1, 2, 3])

    assert.include(result, 1)
    assert.include(result, 2)
    assert.notInclude(result, 3)
  });
});

示例

src/best-practices/bdd-assertions.test.ts