React组件测试：解决onCancel回调未触发导致的测试失败

// ChooseLanguageWindow.react.tsx (部分代码)
import React from 'react';
import { Button, Modal, ModalFooter } from 'react-bootstrap';
// ...其他导入

export interface ChooseLanguageModalProps {
    languageList: SelectOption[];
    onDownloadLanguage: (value?: string) => void;
    onDownload: () => void;
    onCancel?: () => void; // 定义了onCancel回调，但它是可选的
}

// ...其他常量和辅助函数

export const ChooseLanguageModal = (props: ChooseLanguageModalProps) => {
    const { languageList } = props; // 注意：这里没有解构onCancel

    // ...onChangeLanguage 方法

    const handleCancel = async () => {
        // 问题所在：onCancel() 未在此处调用
        await hideChooseLanguageModal();
    };

    const handleDownload = async () => {
        const { onDownload } = props;
        onDownload(); // onDownload在此处被调用

        await hideChooseLanguageModal();
    };

    return (
        <Modal
            // ...Modal props
        >
            {/* ...ModalHeader 和 ModalBody */}
            <ModalFooter>
                <Button bsStyle="primary" onClick={handleDownload}>
                    {DOWNLOAD_BUTTON_TEXT}
                </Button>
                <Button onClick={handleCancel}>{CANCEL_BUTTON_TEXT}</Button>
            </ModalFooter>
        </Modal>
    );
};

// ChooseLanguageWindow.react.test.tsx (部分代码)
import { render, fireEvent, screen } from '@testing-library/react';
import React from 'react';
import { act } from 'react-dom/test-utils';

import { ChooseLanguageModal } from '../ChooseLanguageWindow.react';

describe('ChooseLanguageModal', () => {
    // ...languageList 定义
    const onDownloadLanguage = jest.fn();
    const handleDownload = jest.fn();
    const handleCancel = jest.fn(); // Mock onCancel prop

    test('should call onDownload when download button is clicked', async () => {
        await act(async () => {
            render(
                <ChooseLanguageModal
                    // ...其他props
                    onDownload={handleDownload} // 将mock函数作为onDownload prop传入
                    onCancel={handleCancel}     // 将mock函数作为onCancel prop传入
                />
            );
        });

        const downloadButton = screen.getByText('Download');
        fireEvent.click(downloadButton);

        expect(handleDownload).toHaveBeenCalled(); // 此测试通过
    });

    test('should call onCancel when cancel button is clicked', async () => {
        await act(async () => {
            render(
                <ChooseLanguageModal
                    // ...其他props
                    onDownload={handleDownload}
                    onCancel={handleCancel}
                />
            );
        });

        const cancelButton = screen.getByText('Cancel');
        fireEvent.click(cancelButton);

        expect(handleCancel).toHaveBeenCalled(); // 此测试失败
    });
});

expect(jest.fn()).toHaveBeenCalled()

Expected number of calls: >= 1
Received number of calls:    0

const handleCancel = async () => {
    await hideChooseLanguageModal();
};

const handleDownload = async () => {
    const { onDownload } = props;
    onDownload(); // 正确调用了onDownload prop

    await hideChooseLanguageModal();
};

// ChooseLanguageWindow.react.tsx (修改后)
import React from 'react';
import { Button, Modal, ModalFooter } from 'react-bootstrap';
import ReactDOM from 'react-dom';

import Select from 'controls/Select/Select';
import { getModalRoot } from 'sd/components/layout/admin/forms/FvReplaceFormModal/helpers';
import { DOWNLOAD_BUTTON_TEXT, CANCEL_BUTTON_TEXT } from 'sd/constants/ModalWindowConstants';

import 'sd/components/layout/admin/forms/FvReplaceFormModal/style.scss';
import type { SelectOption } from 'shared/types/General';

const { Body: ModalBody, Header: ModalHeader, Title: ModalTitle } = Modal;

export interface ChooseLanguageModalProps {
    languageList: SelectOption[];
    onDownloadLanguage: (value?: string) => void;
    onDownload: () => void;
    onCancel?: () => void;
}

const HEADER_TITLE = 'Choose language page';
const CHOOSE_LANGUAGE_LABEL = 'Choose language';

export const ChooseLanguageModal = (props: ChooseLanguageModalProps) => {
    // 1. 从props中解构出onCancel
    const { languageList, onCancel } = props; 

    const onChangeLanguage = (value?: string | undefined) => {
        const { onDownloadLanguage } = props;
        onDownloadLanguage(value);
    };

    const handleCancel = async () => {
        // 2. 在这里调用onCancel prop
        onCancel && onCancel(); // 注意：onCancel是可选的，所以进行条件调用
        await hideChooseLanguageModal();
    };

    const handleDownload = async () => {
        const { onDownload } = props;
        onDownload();

        await hideChooseLanguageModal();
    };

    return (
        <Modal
            show
            backdrop="static"
            animation={false}
            container={getModalRoot()}
            onHide={() => hideChooseLanguageModal()}
        >
            <ModalHeader closeButton>
                <ModalTitle>{HEADER_TITLE}</ModalTitle>
            </ModalHeader>
            <ModalBody>
                <div>
                    <p>This project has one or more languages set up in the Translation Manager.</p>
                    <p>
                        To download the translation in the BRD export, select one language from the drop-down below.
                        English will always be shown as the base language.
                    </p>
                    <p>
                        If a language is selected, additional columns will be added to display the appropriate
                        translation for labels, rules and text messages.
                    </p>
                    <p>You may click Download without selecting a language to export the default language.</p>
                </div>
                <div>{CHOOSE_LANGUAGE_LABEL}</div>
                <div>
                    <Select
                        clearable={false}
                        canEnterFreeText={false}
                        searchable={false}
                        options={languageList}
                        onChange={onChangeLanguage}
                    />
                </div>
            </ModalBody>
            <ModalFooter>
                <Button bsStyle="primary" onClick={handleDownload}>
                    {DOWNLOAD_BUTTON_TEXT}
                </Button>
                <Button onClick={handleCancel}>{CANCEL_BUTTON_TEXT}</Button>
            </Modal