cypress-localstorage-commands

Cypress localStorage commands

Extends Cypress' cy commands with localStorage methods. Allows preserving localStorage between tests.

The problem

You want to preserve localStorage between Cypress tests.

This solution

This solution allows you to use all browser localStorage methods through Cypress commands, and preserve it between tests.

Installation

This module is distributed via npm which is bundled with node and should be installed as one of your project's devDependencies:

npm i --save-dev cypress-localstorage-commands

Usage

cypress-localstorage-commands extends Cypress' cy command.

Add this line to your project's cypress/support/commands.js:

import "cypress-localstorage-commands"

You can now use all next commands:

Commands

Save current localStorage values into an internal "snapshot":

cy.saveLocalStorage();

Restore localStorage to previously "snapshot" saved values:

cy.restoreLocalStorage();

Clear localStorage "snapshot" values:

cy.clearLocalStorageSnapshot();

Get localStorage item. Equivalent to localStorage.getItem in browser:

cy.getLocalStorage("item");

Set localStorage item. Equivalent to localStorage.setItem in browser:

cy.setLocalStorage("item", "value");

Remove localStorage item. Equivalent to localStorage.removeItem in browser:

cy.removeLocalStorage("item");

Preserving local storage between tests

Use saveLocalStorage to save a snapshot of current localStorage at the end of one test, and use the restoreLocalStorage command to restore it at the beginning of another one. The usage of beforeEach and afterEach is recommended for this purpose.

Examples

Cookies button example

Next example shows how this package can be used to test a "cookies button" (which theorically sets a flag into localStorage and can be clicked only once)

describe("Accept cookies button", () => {
  const COOKIES_BUTTON = "#accept-cookies";

  before(() => {
    cy.clearLocalStorageSnapshot();
  });

  beforeEach(() => {
    cy.restoreLocalStorage();
    cy.visit("/");
  });

  afterEach(() => {
    cy.saveLocalStorage();
  });

  it("should be visible", () => {
    cy.get(COOKIES_BUTTON).should("be.visible");
  });

  it("should not be visible after clicked", () => {
    cy.get(COOKIES_BUTTON).click();
    cy.get(COOKIES_BUTTON).should("not.be.visible");
  });

  it("should not be visible after reloading", () => {
    cy.get(COOKIES_BUTTON).should("not.be.visible");
  });
});

Note the usage of beforeEach and afterEach for preserving localStorage between all tests. Also clearLocalStorageSnapshot is used in the before statement to avoid possible conflicts with other test files preserving localStorage.

localStorage assertions

Based on the previous example, assertions could be added to check values of localStorage:

describe("localStorage cookies-accepted item", () => {
  beforeEach(() => {
    cy.restoreLocalStorage();
    cy.visit("/");
  });

  afterEach(() => {
    cy.saveLocalStorage();
  });

  it("should be null first time page is visited", () => {
    cy.getLocalStorage("cookies-accepted").should("equal", null);
  });

  it("should be true after clicking cookies button", () => {
    cy.get("#accept-cookies").click();
    cy.getLocalStorage("cookies-accepted").should("equal", "true");
  });

  it("should be true after reloading", () => {
    cy.getLocalStorage("cookies-accepted").then(cookiesAccepted => {
      expect(cookiesAccepted).to.equal("true");
    });
  });
});

Contributing

Contributors are welcome. Please read the contributing guidelines and code of conduct.

License

MIT, see LICENSE for details.