testcafe-nuxt-selectors

This plugin provides selector extensions that make it easier to test Vue components in a Nuxt application with TestCafe. These extensions allow you to test Vue component state and result markup together.

Install

$ npm install testcafe-nuxt-selectors

Usage

Create selectors for Vue components

VueSelector allows you to select page elements by the component tagName or the nested component tagNames.

Suppose you have the following markup.

<div id="todo-app">
    <todo-input />
    <todo-list>
        <todo-item priority="High">Item 1</todo-item>
        <todo-item priority="Low">Item 2</todo-item>
    </todo-list>   
    <div className="items-count">Items count: <span>{{itemCount}}</span></div>
</div>
<script>
    Vue.component('todo-input', {...});
    Vue.component('todo-list', {...});
    Vue.component('todo-item', {...});
    
    new Vue({ 
        el:   '#todo-app',
        data: {...}
    });
</script> 

To get the root Vue instance, use the VueSelector constructor without parameters.

import VueSelector from 'testcafe-vue-selectors';
 
const rootVue = VueSelector();

The rootVue variable will contain the <div id="todo-app"> element.

To get a root DOM element for a component, pass the component name to the VueSelector constructor.

import VueSelector from 'testcafe-vue-selectors';
 
const todoInput = VueSelector('todo-input');

To obtain a nested component, you can use a combined selector.

import VueSelector from 'testcafe-vue-selectors';
 
const todoItem = VueSelector('todo-list todo-item');

You can combine Vue selectors with testcafe Selector filter functions like .find, .withText, .nth and other.

import VueSelector from 'testcafe-vue-selectors';
 
var itemsCount = VueSelector().find('.items-count span');

Let’s use the API described above to add a task to a Todo list and check that the number of items changed.

import VueSelector from 'testcafe-vue-selectors';
 
fixture `TODO list test`
    .page('http://localhost:1337');
 
test('Add new task', async t => {
    const todoTextInput = VueSelector('todo-input');
    const todoItem      = VueSelector('todo-list todo-item');
 
    await t
        .typeText(todoTextInput, 'My Item')
        .pressKey('enter')
        .expect(todoItem.count).eql(3);
});

Obtaining component's props, computed and state

In addition to DOM Node State, you can obtain state, computed or props of a Vue component. You can use them in an assertion directly thus simplifying assertion logic. To get these data, use the Vue selector’s .getVue() method.

If you call this method without parameters, it returns an object of the following structure.

{
    props:    <component_props>,
    state:    <component_state>,
    computed: <component_computed>
}

Example

import VueSelector from 'testcafe-vue-selector';
 
fixture `TODO list test`
    .page('http://localhost:1337');
 
test('Check list item', async t => {
    const todoItem = VueSelector('todo-item');
 
    await t
        .expect(todoItem.getVue().props.priority).eql('High')
        .expect(todoItem.getVue().state.isActive).eql(false)
        .expect(todoItem.getVue().computed.text).eql('Item 1');
});

As an alternative, the .getVue() method can take a function that returns the required property, state or computed property. This function acts as a filter. Its argument is an object returned by .getVue(), i.e. { props: ..., state: ..., computed: ...}.

VueSelector('component').getVue(({ props, state, computed }) => {...});

Example

import VueSelector from 'testcafe-vue-selectors';
 
fixture `TODO list test`
    .page('http://localhost:1337');
 
test('Check list item', async t => {
    const todoItem = VueSelector('todo-item');
 
    await t
        .expect(todoItem.getVue(({ props }) => props.priority)).eql('High')
        .expect(todoItem.getVue(({ state }) => state.isActive)).eql(false)
        .expect(todoItem.getVue(({ computed }) => computed.text)).eql('Item 1');
});
 

The .getVue() method can be called for the VueSelector or the snapshot this selector returns.

Limitations

testcafe-vue-selectors support Vue starting with version 2.

Only props, state and computed parts of a Vue component are avalible.

To check if a component can be found, use the vue-dev-tools extension for a Google Chrome.

Supported pages only with one Vue root.