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

问题描述

下面是我的代码段:

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

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

此处value变为undefined.

我的猜测是，因为描述块从一开始就被加载，所以it.each的值也是如此.任何人都可以帮我一个变通办法，以获取其中的变量值.每个数组?

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?

提前谢谢！

推荐答案

传递值的函数而不是将值本身传递给it.each.

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，因此beforeEach可以修改返回的值:

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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