cypress-book-todomvc

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cypress-book-todomvc

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Cypress tests inside README that update the screenshots

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// repository documentation

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# cypress-book-todomvc

[![ci status][ci image]][ci url] [![renovate-app badge][renovate-badge]][renovate-app]

> Repo [bahmutov/cypress-book-todomvc](https://github.com/bahmutov/cypress-book-todomvc), read the blog post [Cypress Book](https://glebbahmutov.com/blog/cypress-book/). Uses [cypress-book](https://github.com/bahmutov/cypress-book) module to copy the screenshots.

## Initial screen

This application starts with an input field.

![Initial screen](https://raw.githubusercontent.com/bahmutov/cypress-book-todomvc/master/images/initial.png)

<details style="display:none">
<summary>Initial view</summary>

```js
cy.visit('/')
cy.get('input').should('be.visible')
cy.screenshot('initial')
```

</details>

## Main feature

User can enter several todos, and they are added to the list

![Added three todos](https://raw.githubusercontent.com/bahmutov/cypress-book-todomvc/master/images/todos.png)

```js
cy.visit('/')
cy.log('**entering 3 todos 📝**')
cy.get('.new-todo')
  .type('write in Markdown ⌨️{enter}')
  .type('code in JavaScript 💻{enter}')
  .type('test in Cypress 😻{enter}')
cy.log('**assertion ✅**')
cy.get('.todo-list li').should('have.length', 3)
cy.screenshot('todos')
```

</details>

## Completing tasks

Once there are several todo items, the user can mark some items "done" and then clear them using a button.

![Completed several items](https://raw.githubusercontent.com/bahmutov/cypress-book-todomvc/master/images/completed-todos.png)

You can see just the completed items using the filters below the list

![Just completed items](https://raw.githubusercontent.com/bahmutov/cypress-book-todomvc/master/images/just-completed-todos.png)

The "Clear completed" button is at the bottom and becomes visible only if there are completed items.

![Footer](https://raw.githubusercontent.com/bahmutov/cypress-book-todomvc/master/images/footer.png)

Hover over the button and click on it

![Clear completed button](https://raw.githubusercontent.com/bahmutov/cypress-book-todomvc/master/images/clear-completed.png)

Only a single active todo remains

![Single remaining todo](https://raw.githubusercontent.com/bahmutov/cypress-book-todomvc/master/images/remaining-todo.png)

```js
cy.visit('/')
cy.get('.new-todo')
  .type('write in Markdown{enter}')
  .type('code in JavaScript{enter}')
  .type('test in Cypress{enter}')
cy.get('.todo-list li').should('have.length', 3)

cy.contains('.view', 'code in JavaScript').find('.toggle').click()
cy.contains('.view', 'test in Cypress').find('.toggle').click()
cy.get('.todo-list li.completed').should('have.length', 2)
cy.screenshot('completed-todos')

cy.contains('.filters li', 'Completed').click()
cy.get('.todo-list li').should('have.length', 2)
cy.screenshot('just-completed-todos')

cy.contains('.filters li', 'All').click()
cy.get('footer.footer').screenshot('footer')
cy.contains('Clear completed')
  .should('be.visible')
  .then(($el) => {
    $el.css({
      textDecoration: 'underline',
      border: '1px solid pink',
      borderRadius: '2px',
    })
  })
cy.get('footer.footer').screenshot('clear-completed')

// clear completed items and take a screenshot
// of the single active todo
cy.contains('Clear completed').click()
cy.get('.todo-list li').should('have.length', 1)
cy.screenshot('remaining-todo')
```

</details>

## Explanation

This README file contains tests Cypress understands and runs by using [cypress-fiddle](https://github.com/cypress-io/cypress-fiddle) file preprocessor. Start the application and Cypress using

```
npm install
npm run dev
```

And click on the `README.md` file

![README spec](https://raw.githubusercontent.com/bahmutov/cypress-book-todomvc/master/images/readme.png)

The tests should run. These tests are above in this file, hiding inside an invisible HTML element and a comment:

```
<details style="display:none">

... Cypress test ...

</details>
```

This is similar to what I have done in [Self-testing JAM pages](https://www.cypress.io/blog/2019/11/13/self-testing-jam-pages/)

The test usually includes several [.screenshot](https://on.cypress.io/screenshot) commands, these images are moved into [images](images) folder using code in the [cypress/plugins/index.js](cypress/plugins/index.js) file.

You can also take a screenshot with the test runner to show how Cypress looks during the test.

![TodoMVC test inside Cypress](https://raw.githubusercontent.com/bahmutov/cypress-book-todomvc/master/images/demo-test.png)

<details style="display:none">
<summary>TodoMVC test</summary>

```js
cy.visit('/')
cy.log('**entering 2 todos 📝**')
cy.get('.new-todo').type('I ❤️ tests{enter}').type('and 💕 tests{enter}')
cy.log('**assertion ✅**')
cy.get('.todo-list li').should('have.length', 2)
cy.screenshot('demo-test', { capture: 'runner', log: false })
```

</details>

For more advanced use case where you might want to generate video clips from tests, see [cypress-movie](http://github.com/bahmutov/cypress-movie)

### on CI

This project is built from repo [bahmutov/cypress-book-todomvc](https://github.com/bahmutov/cypress-book-todomvc) and tested using [GitHub Actions](https://glebbahmutov.com/blog/trying-github-actions/). If there are any changed screenshots, they are automatically committed and pushed to GH, see [.github/workflows/main.yml](https://github.com/bahmutov/cypress-book-todomvc/tree/master/.github/workflows).

**Note:** screenshots are only overwritten if they are more than 0.1% different from the existing screenshots in file byte size.

Then this README is converted into a static site using [VuePress](https://vuepress.vuejs.org/) and deployed to the GitHub Pages at [https://glebbahmutov.com/cypress-book-todomvc/](https://glebbahmutov.com/cypress-book-todomvc/).

See also [social image test](./social-image.md)

## Debugging

To see verbose messages from this project run with the environment variable

```
DEBUG=cypress-book
```

[ci image]: https://github.com/bahmutov/cypress-book-todomvc/workflows/main/badge.svg?branch=master
[ci url]: https://github.com/bahmutov/cypress-book-todomvc/actions
[renovate-badge]: https://img.shields.io/badge/renovate-app-blue.svg
[renovate-app]: https://renovateapp.com/

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