Question

您好，我正在尝试使用Jest测试以下代码，但是在运行测试时，我收到未定义的mData错误。请查看下面的代码，如果可能的话，请让我知道我在哪里出错。提前致谢。

function createMilkShakeData(mData) {

 }

 describe("milkshake Data Generator", () => {
 it("creates correct data structure ", () => {
  const mData = [
    "milkshake1/milkshake1flavour",
    "milkshake1/milkshake1flavor2",
    "milkshake2/milkshake2flavour",
    "milkshake2/milkshake2flavour2",
    "milkshake1/milkshake1flavour3",
    "flavour3",
    "milkshake3/flavour3flavour1",
    "milkshake4"
  ];

  const expectedResult = [
    {
      title: "milkshake1",
      data: ["milkshake1flavour", "milkshake1flavour2", "milkshake1flavour3"]
    },
    { title: "milkshake2", data: ["milkshake2flavour", "milkshake2flavour2"] },
    { title: "milkshake3", data: ["milkshake3flavour1"] }
  ];

  const actualResult = createMilkShakeData(mData);
  expect(actualResult).toMatchObject(expectedResult);
});
});

module.exports = createMilkShakeData
module.exports = mData

下面的测试文件中的

代码

    const createMilkShakeData = require('./milkshake')

    const data = require('./milkshake')

    test('milkshake Data Generator', () => {

    const actualResult = createMilkShakeData(mData);
  expect(actualResult).toMatchObject(expectedResult)}
  )

Answer 1

mData不在您的第一个文件的全局范围内定义-它仅在函数的范围中定义-在这种情况下，来自Jest it。如果您需要导出，请在全局范围内（即在“描述”之前）进行定义。

开玩笑的测试问题

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