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+/// <reference types="cypress" />
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+
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+// Welcome to Cypress!
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+//
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+// This spec file contains a variety of sample tests
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+// for a todo list app that are designed to demonstrate
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+// the power of writing tests in Cypress.
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+//
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+// To learn more about how Cypress works and
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+// what makes it such an awesome testing tool,
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+// please read our getting started guide:
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+// https://on.cypress.io/introduction-to-cypress
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+
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+describe('example to-do app', () => {
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+ beforeEach(() => {
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+ // Cypress starts out with a blank slate for each test
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+ // so we must tell it to visit our website with the `cy.visit()` command.
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+ // Since we want to visit the same URL at the start of all our tests,
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+ // we include it in our beforeEach function so that it runs before each test
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+ cy.visit('https://example.cypress.io/todo')
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+ })
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+
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+ it('displays two todo items by default', () => {
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+ // We use the `cy.get()` command to get all elements that match the selector.
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+ // Then, we use `should` to assert that there are two matched items,
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+ // which are the two default items.
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+ cy.get('.todo-list li').should('have.length', 2)
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+
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+ // We can go even further and check that the default todos each contain
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+ // the correct text. We use the `first` and `last` functions
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+ // to get just the first and last matched elements individually,
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+ // and then perform an assertion with `should`.
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+ cy.get('.todo-list li').first().should('have.text', 'Pay electric bill')
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+ cy.get('.todo-list li').last().should('have.text', 'Walk the dog')
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+ })
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+
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+ it('can add new todo items', () => {
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+ // We'll store our item text in a variable so we can reuse it
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+ const newItem = 'Feed the cat'
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+
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+ // Let's get the input element and use the `type` command to
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+ // input our new list item. After typing the content of our item,
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+ // we need to type the enter key as well in order to submit the input.
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+ // This input has a data-test attribute so we'll use that to select the
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+ // element in accordance with best practices:
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+ // https://on.cypress.io/selecting-elements
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+ cy.get('[data-test=new-todo]').type(`${newItem}{enter}`)
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+
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+ // Now that we've typed our new item, let's check that it actually was added to the list.
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+ // Since it's the newest item, it should exist as the last element in the list.
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+ // In addition, with the two default items, we should have a total of 3 elements in the list.
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+ // Since assertions yield the element that was asserted on,
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+ // we can chain both of these assertions together into a single statement.
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+ cy.get('.todo-list li')
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+ .should('have.length', 3)
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+ .last()
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+ .should('have.text', newItem)
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+ })
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+
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+ it('can check off an item as completed', () => {
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+ // In addition to using the `get` command to get an element by selector,
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+ // we can also use the `contains` command to get an element by its contents.
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+ // However, this will yield the <label>, which is lowest-level element that contains the text.
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+ // In order to check the item, we'll find the <input> element for this <label>
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+ // by traversing up the dom to the parent element. From there, we can `find`
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+ // the child checkbox <input> element and use the `check` command to check it.
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+ cy.contains('Pay electric bill')
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+ .parent()
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+ .find('input[type=checkbox]')
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+ .check()
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+
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+ // Now that we've checked the button, we can go ahead and make sure
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+ // that the list element is now marked as completed.
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+ // Again we'll use `contains` to find the <label> element and then use the `parents` command
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+ // to traverse multiple levels up the dom until we find the corresponding <li> element.
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+ // Once we get that element, we can assert that it has the completed class.
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+ cy.contains('Pay electric bill')
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+ .parents('li')
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+ .should('have.class', 'completed')
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+ })
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+
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+ context('with a checked task', () => {
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+ beforeEach(() => {
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+ // We'll take the command we used above to check off an element
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+ // Since we want to perform multiple tests that start with checking
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+ // one element, we put it in the beforeEach hook
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+ // so that it runs at the start of every test.
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+ cy.contains('Pay electric bill')
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+ .parent()
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+ .find('input[type=checkbox]')
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+ .check()
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+ })
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+
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+ it('can filter for uncompleted tasks', () => {
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+ // We'll click on the "active" button in order to
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+ // display only incomplete items
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+ cy.contains('Active').click()
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+
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+ // After filtering, we can assert that there is only the one
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+ // incomplete item in the list.
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+ cy.get('.todo-list li')
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+ .should('have.length', 1)
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+ .first()
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+ .should('have.text', 'Walk the dog')
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+
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+ // For good measure, let's also assert that the task we checked off
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+ // does not exist on the page.
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+ cy.contains('Pay electric bill').should('not.exist')
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+ })
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+
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+ it('can filter for completed tasks', () => {
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+ // We can perform similar steps as the test above to ensure
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+ // that only completed tasks are shown
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+ cy.contains('Completed').click()
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+
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+ cy.get('.todo-list li')
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+ .should('have.length', 1)
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+ .first()
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+ .should('have.text', 'Pay electric bill')
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+
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+ cy.contains('Walk the dog').should('not.exist')
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+ })
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+
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+ it('can delete all completed tasks', () => {
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+ // First, let's click the "Clear completed" button
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+ // `contains` is actually serving two purposes here.
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+ // First, it's ensuring that the button exists within the dom.
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+ // This button only appears when at least one task is checked
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+ // so this command is implicitly verifying that it does exist.
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+ // Second, it selects the button so we can click it.
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+ cy.contains('Clear completed').click()
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+
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+ // Then we can make sure that there is only one element
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+ // in the list and our element does not exist
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+ cy.get('.todo-list li')
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+ .should('have.length', 1)
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+ .should('not.have.text', 'Pay electric bill')
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+
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+ // Finally, make sure that the clear button no longer exists.
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+ cy.contains('Clear completed').should('not.exist')
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+ })
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+ })
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+})
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Yuki Takei