@cloudpayments/checkout/__test__/index.spec.js

const url = 'https://checkout.cloudpayments.ru/checkout.js';
const publicId = 'test_api_00000000000000000000001';

function dispatchScriptEvent(eventType) {
    const injectedScript = document.querySelector(
        `script[src="${url}"]`
    );

    if (!injectedScript) {
        throw new Error('checkout script not found');
    }

    injectedScript.dispatchEvent(new Event(eventType));
}

describe('npm load', () => {
    afterEach(() => {
        const script = document.querySelector(`script[src="${url}"], script[src="${url}/"]`);
        if (script && script.parentElement) {
            script.parentElement.removeChild(script);
        }
        delete window.cp?.Checkout;
    });

    it('not empty', async () => {

        await checkout.loadCheckout({publicId: `${publicId}`});

        expect(document.querySelector(`script[src="${url}"]`)).to.be.not.a('null');
    });

    it('script into window', async () => {

        await checkout.loadCheckout({publicId: `${publicId}`});

        document.querySelector(`script[src="${url}"], script[src="${url}/"]`);

        expect(window.cp.Checkout).to.be.not.a('null');
    });

    it('script into window', async () => {

        await checkout.loadCheckout({publicId: `${publicId}`});

        const script = document.createElement('script');
        script.src = url;
        document.body.appendChild(script);
        
        expect(document.querySelectorAll(`script[src="${url}"], script[src="${url}/"]`)).to.have.length(1);
    });

    it('проверка возможности добавить чекаут и виджет', async () => {

        await checkout.loadCheckout({publicId: `${publicId}`});

        const script = document.createElement('script');
        script.src = 'https://widget.cloudpayments.ru/bundles/cloudpayments';
        document.body.appendChild(script);

        expect(document.querySelector(`script[src="${url}"], script[src="${url}/"]`)).to.be.not.a('null');
        expect(document.querySelector(`script[src="https://widget.cloudpayments.ru/bundles/cloudpayments"]`)).to.be.not.a('null');
    });

    it('проверка возможности добавить чекаут и виджет#2', async () => {

        await checkout.loadCheckout({publicId: `${publicId}`});

        const script = document.createElement('script');
        script.src = 'https://widget.cloudpayments.ru/bundles/cloudpayments';
        document.body.appendChild(script);

        expect(window.cp.Checkout).to.be.not.a('null');
        expect(window.cp.CloudPayments).to.be.not.a('null');
    });

});