function updateVaultItemList(vaultUrl, vaultItems) {
  window.localStorage.setItem('swh-vault-cooking-tasks', JSON.stringify(vaultItems));
  return cy.visit(vaultUrl);
}

it('should display and upgrade previous cooking tasks from the legacy format', function() {
  updateVaultItemList(this.Urls.browse_vault(), this.legacyVaultItems).then(() => {
    // here we are sure that localStorage content has been modified and processed
    // by code in vault-ui.js file
  });
});