在 test.each Jest 中使用变量表达式 [英] Use variable expressions in test.each Jest

问题描述

以下是我的代码片段:

describe('Upper Describe,()=>{
  let value;
  beforeEach(()=>{
    value=require('testModule').value;
  });

  it.each([
    `${value}`,
  ])('test something',(value)=>{
    console.log(value);
  });
});

这里的 value 变成了 undefined.

我的猜测是因为随着描述块在开始时被加载，it.each 的值也是如此.任何人都可以帮我解决方法来获取 it.each 数组中的变量值吗?

My guess is it is because as the describe blocks get loaded at the starting so are the values for it.each. Can anyone please help me with a workaround to get the variable values inside it.each array?

提前致谢！！

推荐答案

不是将值本身传递给 it.each，而是传递一个返回值的函数.

Instead of passing the value itself to it.each pass a function that returns the value.

这将延迟对值的评估，以便 beforeEach 可以修改返回的内容:

This will delay evaluation of the value so beforeEach can modify what gets returned:

describe('Upper Describe', () => {
  let value;
  beforeEach(() => {
    value = require('testModule').value;
  });

  it.each([
    () => `${value}`,  // pass a function that returns the value
  ])('test something', (func) => {
    console.log(func());  // SUCCESS: prints value export from testModule
  });
});

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