如何强制 Jest 查看嵌套的 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，我要测试：

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 测试它时：

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);
});

我明白了：

ReferenceError: cellIsSuitable 未定义

如何强制Jest 看到我的嵌套函数cellIsSuitable？

附：我的项目自举with create-react-app。

Answer 1

将其移至顶部或使其成为常规的function，以便将其吊起。函数在你使用后被赋值，但变量被声明。

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

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

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