Javascript Jest：如何测试调用身体中另一个函数的函数

我正在尝试测试makeRandomComputerMove函数，但是，我无法使用Jest正确模拟从同一模块导出的getRandomNumber函数

如果我在测试文件中直接调用getRandomNumber函数，它会按预期工作，但我的印象是，在测试文件中模拟函数应该强制内部makeRandomComputerMove函数使用模拟值

任何帮助都将不胜感激

test.ticTacToe.js

describe('TicTacToe Utils', () => {
    const randomMock = jest.spyOn(Utils, 'getRandomNumber')
        .mockReturnValueOnce(0)
        .mockReturnValueOnce(1)

    const board = [
        [['X'], [], []],
        [[], [], []],
        [[], [], []]
        ]

    it('makeRandomComputerMove', () => {
        const location = Utils.makeRandomComputerMove(board)
        // expect(location.x).toBe(0)
        // expect(location.y).toBe(1)
    })
})

export const getRandomNumber = (min, max) => {
    return Math.floor(Math.random() * (max - min + 1)) + min;
}

export const makeRandomComputerMove = (board) => {
    const location = {};
    location.x = getRandomNumber(0, board.length - 1);
    location.y = getRandomNumber(0, board.length - 1);
    if (location.x < 3 && location.y < 3) {
        return location

    }
    return makeRandomComputerMove(board);   
};

ticTacToe.js

describe('TicTacToe Utils', () => {
    const randomMock = jest.spyOn(Utils, 'getRandomNumber')
        .mockReturnValueOnce(0)
        .mockReturnValueOnce(1)

    const board = [
        [['X'], [], []],
        [[], [], []],
        [[], [], []]
        ]

    it('makeRandomComputerMove', () => {
        const location = Utils.makeRandomComputerMove(board)
        // expect(location.x).toBe(0)
        // expect(location.y).toBe(1)
    })
})

export const getRandomNumber = (min, max) => {
    return Math.floor(Math.random() * (max - min + 1)) + min;
}

export const makeRandomComputerMove = (board) => {
    const location = {};
    location.x = getRandomNumber(0, board.length - 1);
    location.y = getRandomNumber(0, board.length - 1);
    if (location.x < 3 && location.y < 3) {
        return location

    }
    return makeRandomComputerMove(board);   
};

当makeRandomComputerMove在同一文件中调用getRandomNumber时，您将无法模拟它

相反，您可以将getRandomNumber移动到一个单独的文件中，然后可以模拟该文件：

getRandomNumber.js

ticTacToe.js

describe('TicTacToe Utils', () => {
    const randomMock = jest.spyOn(Utils, 'getRandomNumber')
        .mockReturnValueOnce(0)
        .mockReturnValueOnce(1)

    const board = [
        [['X'], [], []],
        [[], [], []],
        [[], [], []]
        ]

    it('makeRandomComputerMove', () => {
        const location = Utils.makeRandomComputerMove(board)
        // expect(location.x).toBe(0)
        // expect(location.y).toBe(1)
    })
})

export const getRandomNumber = (min, max) => {
    return Math.floor(Math.random() * (max - min + 1)) + min;
}

export const makeRandomComputerMove = (board) => {
    const location = {};
    location.x = getRandomNumber(0, board.length - 1);
    location.y = getRandomNumber(0, board.length - 1);
    if (location.x < 3 && location.y < 3) {
        return location

    }
    return makeRandomComputerMove(board);   
};

我希望这有帮助