Add e2e tests

cypress.json

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+{
+    "baseUrl": "http://localhost:3000",
+    "fixturesFolder": "cypress/fixtures"
+}

cypress/fixtures/example.json

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+{
+  "name": "Using fixtures to represent data",
+  "email": "[email protected]",
+  "body": "Fixtures are a great way to mock data for responses to routes"
+}

cypress/integration/e2e.spec.js

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+describe("Test todos", () => {
+  it("Add todo", () => {
+    cy.visit("/");
+
+    cy.contains('[data-testid="navigation"] > a', "Todos Example").click();
+
+    cy.get('[data-testid="todos"] > input')
+      .type("Learn to test{enter}")
+      .type("Practice{enter}")
+      .type("Keep trying{enter}");
+
+    cy.get(
+      'label:contains("Learn to test") > input[type="checkbox"]'
+    ).should("not.be.checked");
+    cy.get(
+      'label:contains("Practice") > input[type="checkbox"]'
+    ).should("not.be.checked");
+    cy.get(
+      'label:contains("Keep trying") > input[type="checkbox"]'
+    ).should("not.be.checked");
+  });
+
+  it("Check todo", () => {
+    cy.visit("/");
+
+    cy.contains('[data-testid="navigation"] > a', "Todos Example").click();
+
+    cy.get('[data-testid="todos"] > input')
+      .type("Learn to test{enter}")
+      .type("Practice{enter}")
+      .type("Keep trying{enter}");
+
+    cy.contains('label', "Practice").click();
+
+    cy.get(
+      'label:contains("Learn to test") > input[type="checkbox"]'
+    ).should("not.be.checked");
+    cy.get(
+      'label:contains("Practice") > input[type="checkbox"]'
+    ).should("be.checked");
+    cy.get(
+      'label:contains("Keep trying") > input[type="checkbox"]'
+    ).should("not.be.checked");
+  });
+
+  it("Delete todo", () => {
+    cy.visit("/");
+
+    cy.contains('[data-testid="navigation"] > a', "Todos Example").click();
+
+    cy.get('[data-testid="todos"] > input')
+      .type("Learn to test{enter}")
+      .type("Practice{enter}")
+      .type("Keep trying{enter}");
+
+    cy.contains('label', "Practice")
+      .siblings("button")
+      .click();
+
+    cy.get('[data-testid="todos-list"]').should(
+      "have.descendants",
+      'label:contains("Learn to test")'
+    );
+    cy.get('[data-testid="todos-list"]').should(
+      "not.have.descendants",
+      'label:contains("Practice")'
+    );
+    cy.get('[data-testid="todos-list"]').should(
+      "have.descendants",
+      'label:contains("Keep trying")'
+    );
+  });
+});

cypress/plugins/index.js

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+// ***********************************************************
+// This example plugins/index.js can be used to load plugins
+//
+// You can change the location of this file or turn off loading
+// the plugins file with the 'pluginsFile' configuration option.
+//
+// You can read more here:
+// https://on.cypress.io/plugins-guide
+// ***********************************************************
+
+// This function is called when a project is opened or re-opened (e.g. due to
+// the project's config changing)
+
+module.exports = (on, config) => {
+  // `on` is used to hook into various events Cypress emits
+  // `config` is the resolved Cypress config
+}

cypress/support/commands.js

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+// ***********************************************
+// This example commands.js shows you how to
+// create various custom commands and overwrite
+// existing commands.
+//
+// For more comprehensive examples of custom
+// commands please read more here:
+// https://on.cypress.io/custom-commands
+// ***********************************************
+//
+//
+// -- This is a parent command --
+// Cypress.Commands.add("login", (email, password) => { ... })
+//
+//
+// -- This is a child command --
+// Cypress.Commands.add("drag", { prevSubject: 'element'}, (subject, options) => { ... })
+//
+//
+// -- This is a dual command --
+// Cypress.Commands.add("dismiss", { prevSubject: 'optional'}, (subject, options) => { ... })
+//
+//
+// -- This is will overwrite an existing command --
+// Cypress.Commands.overwrite("visit", (originalFn, url, options) => { ... })

cypress/support/index.js

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+// ***********************************************************
+// This example support/index.js is processed and
+// loaded automatically before your test files.
+//
+// This is a great place to put global configuration and
+// behavior that modifies Cypress.
+//
+// You can change the location of this file or turn off
+// automatically serving support files with the
+// 'supportFile' configuration option.
+//
+// You can read more here:
+// https://on.cypress.io/configuration
+// ***********************************************************
+
+// Import commands.js using ES2015 syntax:
+import './commands'
+
+// Alternatively you can use CommonJS syntax:
+// require('./commands')