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I need help 
My page object structure is like below

const MENU_BUTTON = '.mat-icon[_ngcontent-nci-c6]';
class TopNavigationBar {

    get menuButton() {
        return cy.get(MENU_BUTTON);
    }
}
export default TopNavigationBar

I added a custom command to check that any element's  text 
// Code in command.js
Cypress.Commands.add('shouldContain', (selector, text) => {
  selector.should('contain', text);
})

and I tried to use this command but its not working 

I tried to use the custom command like below

export function displayUserProfileMenu () {
    cy.shouldContain(topNavigationBar.menuButton, 'automationbetelgeuseqa')

};

can anyone please provide the solution?