browser-monkey

browser monkey

Reliable DOM testing

npm install browser-monkey

Browser Monkey is a DOM assertion library. It helps you write framework agnostic browser tests that are reliable in the face of asynchronous behaviours like animations, AJAX and delayed rendering. It also helps you to write tests that exhibit the semantic meaning of the page, as opposed to a jumble of CSS selectors.

• timing resistant
• create rich DSLs for your page structure
• framework agnostic: works with React, Angular, jQuery, Plastiq and many many more.
• can simulate text entry and clicks. (please let us know if you need more!)
• returns promises that resolve when the elements are found.

example

describe('admin', function () {
  // describes the admin panel, with a search box, results and a user editor
  var adminPanel = browser.extend({
    searchUsers: function () {
      return this.find('.search');
    },
    userResult: function (name) {
      // find a user in the results by their name
      return this.find('.results .user', {text: name});
    }
    userEditor: function () {
      // return the user editor, scoped to the .user-editor div.
      return userEditor.scope(this.find('.user-editor'));
    }
  });

  // describes the user editor, with inputs for name and email, and a save button.
  var userEditor = browser.extend({
    name: function () { this.find('.name'); },
    email: function () { this.find('.email'); },
    save: function () { this.find('.save'); },
  });

  it('can search for, edit and save a user', function () {
    return adminPanel.searchUsers().typeIn('bar').then(function () {
      return adminPanel.userResult('Barry').click();
    }).then(function () {
      var userEditor = adminPanel.userEditor();
      return Promise.all([
        userEditor.name().typeIn('Barry Jones'),
        userEditor.email().typeIn('[e-mail]')
      ]).then(function () {
        return userEditor.save().click();
      });
    }).then(function () {
      // verify that the user was saved
      // use mockjax-router!
    });
  });
});

api

The API is made up of three concepts: scopes, actions and assertions.

• scopes are chains of queries, such as find(css) and containing(css), that progressively narrow the scope of elements to be searched for. These queries return new scopes.
• actions such as click() and typeIn(text) wait for the scope to be found before simulating a UI event. These return promises that resolve when the event has been dispatched.
• assertions such as shouldExist() and shouldHave(properties) can be made on scopes to ensure that they exist or contain text, classes or other properties.

All scope chains are immutable, so you can reuse portions of a scope chain to build new chains:

var details = browser.find('.details'); // finds .details
var name = details.find('.name');       // finds .details .name
var email = details.find('.email');     // finds .details .email
...

The API starts with the browser scope, which contains everything on the page.

You can also create DSLs for components on the page using scope.extend(methods). By extending a scope, you can add methods that represent elements of the component at a higher level than mere CSS selectors. It's probably worth noting that these methods should normally just return scopes and not perform actions or assertions.

find

var innerScope = scope.find(css, [options]);

Returns a new scope that matches css.

• css - css to find in the scope
• options.text - text to find in the scope.

containing

var scope = scope.containing(css, [options]);

Ensures that the scope contains the css and options.text, the scope returned still refers to the outer scope. This is useful, for example, in finding list items that contain certain elements, but still referring to the list items.

• css - css to find in the scope
• options.text - text to find in the scope.

For example, find the li that contains the h2 with the text Second, and click the link in the li.

<ul>
	<li>
		<h2>First</h2>
        <a href="first">link</a>
	</li>
	<li>
		<h2>Second</h2>
        <a href="second">link</a>
	</li>
	<li>
		<h2>Third</h2>
        <a href="third">link</a>
	</li>
</ul>

browser.find('ul li').containing('h2', {text: 'Second'}).find('a').click();

component

Represents a component on the page, with methods to access certain elements of the component.

var componentScope = scope.component(methods);

• methods - an object containing functions for scopes of elements inside the component.
• componentScope - a scope, but containing additional access methods

You can create a component from another component too, simply extending the functionality in that component.

For example, you may have an area on the page that deals with instant messages. You have a list of messages, a text box to enter a new message, and a button to send the message.

var messages = browser.component({
  messages: function () {
    return this.find('.messages');
  },
  messageText: function () {
    return this.find('input.message');
  },
  sendButton: function () {
    return this.find('button', {text: 'Send'});
  }
});

You can then use the messages component:

messages.messages().shouldHave({text: ['hi!', 'wassup?']}).then(function () {
  return messages.messageBox().typeIn("just hangin'");
}).then(function () {
  return messages.sendButton().click();
});

scope

You can reset the starting point for the scope, the element from which all elements are searched for. By default this is the <body> element, but you can set it to a more specific element, or indeed another scope.

var scopeUnderElement = scope.scope(element | selector | anotherScope);

• element - an element

• selector - a CSS selector string

• anotherScope a scope to define where to start this scope. This is useful if you want to set the starting scope of a comonent. E.g.

  var component = browser.component({
    ... methods ...
  });
  var componentScope = component.scope(browser.find('.component'));
  

shouldExist

Wait for an element to exist.

var promise = scope.shouldExist();

Returns a promise that resolves when the element exists, or is rejected if the timeout expires.

shouldHave

Assert that a scope has certain properties

var promise = scope.shouldHave(options);

• options.text - a string, expects the resolved scope to have the text. If an array of strings, expects the elements to have the same number of elements as there are strings in the array, and expects each string to be found in each respective element's text.
• options.css - a CSS string. Expects the resolved element to be matched by the CSS selector. Note that it won't match if the element contains other elements that match the CSS selector. So if we have {css: '.class'} then we expect the resolved element to have a class class.
• options.value - a string, expects the resolved element to be an input and have the value. An array expects the same number of inputs, each with the respective value.
• options.length - a number, expects there to be this number of elements
• options.elements - a function, which is passed the resolved elements, return truthy for a match, falsey for a failure.
• options.message - the error message