How to use the lwc.createElement function in lwc

setPage(tagName, component, props = {}) {
        const el = createElement(tagName, {
            is: component,
            fallback: false,
        });

        Object.assign(el, props);

        // Remove previous components from the container if necessary
        const container = this.template.querySelector('.container');
        while (container.firstChild) {
            container.removeChild(container.firstChild);
        }

        container.appendChild(el);
    }
}

it('registers with dependecy manager', () => {
        const element = createElement('lightningtest-mock-record-edit-holder', {
            is: MockRecordHolder
        });

        element.objectApiName = 'Bad_Guy__c';
        element.showPicklist = true;
        window.PICKLIST_REPRESENTATION = picklistRepresentation;
        window.DEPENDENCY_INFO = null;
        document.body.appendChild(element);
        return new Promise((resolve, reject) => {
            element.addEventListener('load', () => {
                try {
                    expect(mockConstructor).toHaveBeenCalledWith(
                        expect.objectContaining({
                            dependentFields: undefined,
                            picklistValues: expect.any(Object)
                        })

const createFormattedTimeComponent = () => {
    const element = createElement('c-formatted-time', {
        is: Element
    });

    document.body.appendChild(element);
    return element;
};

const createSectionWithMock = mock => {
            const element = createElement('c-accordion-section', {
                is: Element
            });

            const parentDiv = document.createElement('div');

            document.body.appendChild(parentDiv);
            parentDiv.addEventListener('privateaccordionsectionregister', mock);

            parentDiv.appendChild(element);

            return element;
        };

const createComponent = () => {
    const element = createElement('c-formatted-number', {
        is: Element
    });

    document.body.appendChild(element);
    return element;
};

const createButtonMenu = () => {
    const element = createElement('c-button-menu', { is: Element });
    document.body.appendChild(element);
    return element;
};

const createComponent = (params = {}) => {
    const element = createElement('c-tile', {
        is: Element
    });

    element.label = TILE_TITLE;
    Object.assign(element, params);
    document.body.appendChild(element);
    return element;
};

const createIcon = () => {
    const element = createElement('c-icon', { is: Element });
    document.body.appendChild(element);
    return element;
};

const createComponent = () => {
    const element = createElement('c-formatted-text', { is: Element });
    document.body.appendChild(element);
    return element;
};
const exampleText =

before(() => {
        tableElement = createElement('benchmark-table-component', { is: Table });
        return insertTableComponent(tableElement);
    });