install cypress and add initial test

cypress/e2e/login.cy.ts

@@ -0,0 +1,12 @@
+describe('Login test', () => {
+  it('logs user in with correct credentials and logs user out', () => {
+    cy.visit('/login');
+    cy.dataCy('input-username').type(Cypress.env('umami_user'));
+    cy.dataCy('input-password').type(Cypress.env('umami_password'));
+    cy.dataCy('button-submit').click();
+    cy.url().should('eq', Cypress.config().baseUrl + '/dashboard');
+    cy.dataCy('button-profile').click();
+    cy.dataCy('item-logout').click();
+    cy.url().should('eq', Cypress.config().baseUrl + '/login');
+  });
+});

cypress/support/e2e.ts

@@ -0,0 +1,5 @@
+/// <reference types="cypress" />
+
+Cypress.Commands.add('dataCy', value => {
+  return cy.get(`[data-cy=${value}]`);
+});

cypress/support/index.d.ts

@@ -0,0 +1,11 @@
+/// <reference types="cypress" />
+
+declare namespace Cypress {
+  interface Chainable {
+    /**
+     * Custom command to select DOM element by data-cy attribute.
+     * @example cy.dataCy('greeting')
+     */
+    dataCy(value: string): Chainable<JQuery<HTMLElement>>;
+  }
+}

cypress/tsconfig.json

@@ -0,0 +1,8 @@
+{
+  "compilerOptions": {
+    "target": "es5",
+    "lib": ["es5", "dom"],
+    "types": ["cypress", "node"]
+  },
+  "include": ["**/*.ts"]
+}