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Testing components

Contents

• describeComponent (render function and helpers)
• Ensure that component render given text
• Ensure that component's el/nested el has given class/text/attr
• Ensure that component renders another component with given props/children
• Ensure that component render collection of components (with props/children)
• Ensure that component bind events
• Ensure that component bind events
• Ensure that component calls given actions
• Testing component mixins

describeComponent

describeComponent is a helper that simplify process of testing components. Basically it does:

1. Prepares playground on beforeEach (you will have empty block where you can render component in test).
2. Creates render function that accepts props and children and that returns rendered DOM el; render passed as first argument to context function.
3. Passes helpers to context function as second argument.

var Component = rewire('component');

describeComponent(Component, function(render, helpers) {
  // Tests here.
});

render

It accepts:

1. props - Object with props that will be passed to component (optional, can be null),
2. children - *, children that will be passed to component (optional).

// Will render described component with `{ color: 'red' }` as props and
// `'Children'` as children.
render({ color: 'red' }, 'Children');

render have with function that binds props and children to render:

var bindedRender = render.with({ color: 'red' }, 'Children');
// Will render described component with `{ color: 'red' }` as props and
// `'Children'` as children.
bindedRender();

helpers

TODO

Ensure that component render given text

it('renders children as text', function() {
  var text = 'Check, check, 1, 2, 3.';
  expect(render.with(null, text)).to.render.text(text);
});

Ensure that component's el/nested el has given class/text/attr

Compound expectation

Root element:

it('renders link with "is-red" class for `color` equals "red"', function() {
  expect(render.with({ color: 'red' }, 'Click me!')).to.render.el({
    is: '.is-red',
    href: '#',
    text: 'Click me!'
  });
});

Nested element:

it('renders link with "is-red" class for `color` equals "red"', function() {
  expect(render.with({ color: 'red' }, 'Click me!')).to.render.el({
    find: 'a',
    is: '.is-red',
    href: '#',
    text: 'Click me!',
    props: {
      disabled: false,
      value: 'Value'
    }
  });
});

Has class name

expect(render).to.render.el.withClass('link');

Match selector

expect(render).to.render.el.matches('a.link');

Attr expectation

expect(render).to.render.el.withAttr('href', '#');

Attrs expectation

expect(render).to.render.el.withAttrs({
  href: '#',
  rel: 'link'
});

Prop expectation

expect(render).to.render.el.withProp('disabled', false);

Props expectation

expect(render).to.render.el.withProps({
  disabled: false,
  value: 'Value'
});

Has value

expect(render).to.render.el.withValue('Input value');

Nested el

expect(render).to.render.el.contains('.link-icon');

Ensure that component renders another component with given props/children

Component:

it('renders another component', function() {
  expect(render).to.render.component('AnotherComponent');
});

Component with props and children (expect props equality):

it('renders another component with specified props and children', function() {
  expect(render).to.render.component('AnotherComponent', {
    with: [
      {
        type: 'test',
        color: 'red'
      },
      'Text'
    ]
  });
});

Fuzzy match of props:

it('renders another component with specified props and children', function() {
  expect(render).to.render.component('AnotherComponent', {
    with: [
      match({
        type: 'test',
        color: 'red'
      }),
      'Text'
    ]
  });
});

Ensure that component render collection of components (with props/children)

Works the same way as component but instead of props and children as second and thrid arguments it accepts array of arrays.

it('renders another component with specified props and children', function() {
    expect(render).to.render.components('AnotherComponent', {
      with: [
        [{ type: 'test', color: 'red' }, 'Text'],
        [{ type: 'test', color: 'green' }, 'Text']
      ]
    });
});

Ensure that component bind events

TODO

Ensure that component calls given actions

TODO

Testing component mixins

TODO