Cypress custom Amplify command.

commands.js

Cypress.Commands.add("signIn", () => {
  cy.then(() => Auth.signIn(username, password)).then((cognitoUser) => {
    const idToken = cognitoUser.signInUserSession.idToken.jwtToken;
    const accessToken = cognitoUser.signInUserSession.accessToken.jwtToken;

    const makeKey = (name) => `CognitoIdentityServiceProvider.${cognitoUser.pool.clientId}.${cognitoUser.username}.${name}`;

    cy.setLocalStorage(makeKey("accessToken"), accessToken);
    cy.setLocalStorage(makeKey("idToken"), idToken);
    cy.setLocalStorage(
      `CognitoIdentityServiceProvider.${cognitoUser.pool.clientId}.LastAuthUser`,
      cognitoUser.username
    );
  });
  cy.saveLocalStorage();
});