如何强制 Jest 看到嵌套的 javascript 函数？

Question

我的项目中有这样的结构

|...
|Utils
    | Utils.js
    | Utils.test.js
|...

在Utils.js我有func，我想测试：

export const getSurroundingCells = (numRows, numCols, shipPositions) => {
    ...
    // some logic that calls cellIsSuitable()
    ...
    const cellIsSuitable = (position, shipPositions) => {
        ...
        // some logic that uses numRows, numCols
        ...
    }
}

当我想通过 Jest 和 Utils.test.js 进行测试时：

import {getSurroundingCells} from "./Utils";

const shipPositions = [[1, 1], [1, 2], [1, 3]];
const expectedSurroundingCells = [[2, 1], [2, 0], [1, 0], [0,0], [0,1], [0,2], [2,2]];

test('takes positions and returns surrounding cells', () => {
    expect(getSurroundingCells(10, 10, shipPositions)).toBe(expectedSurroundingCells);
});

我得到：

ReferenceError: cellIsSuitable is not defined

如何强制 Jest 查看我的嵌套函数 cellIsSuitable？

P.S。我的项目是自举的 with create-react-app。

Answer 1

将其移至顶部或使其成为常规 function 以便将其提升。函数是在你使用后赋值的，但变量是声明的。

export const getSurroundingCells = (numRows, numCols, shipPositions) => {

    const cellIsSuitable = (position, shipPositions) => {
        ...
        // some logic that uses numRows, numCols
        ...
    }

    ...
    // some logic that calls cellIsSuitable()
    ...
}

如何强制 Jest 看到嵌套的 javascript 函数？

How to force Jest to see nested javascript function?

javascript

jestjs

create-react-app