karma-viewport

karma-viewport

Karma viewport resizer for testing responsive features and layout.

Installation

npm install karma-viewport

Usage

Basic configuration

Add viewport to the list of frameworks inside your Karma configuration:

// karma.conf.js
module.exports = function(config) {
  config.set({
    frameworks: ["viewport"]
  })
}

This will expose the global variable viewport which allows setting the dimensions of the viewport within tests, e.g.:

// Set to 320px x 100%
viewport.set(320)

// Set to 320px x 480px
viewport.set(320, 480)

// Reset to 100% x 100%
viewport.reset()

Remember to call viewport.reset() after each test, e.g. for Jasmine or Mocha:

afterEach(() => {
  viewport.reset()
})

Advanced configuration

config.viewport.context

By default, viewport will target the default iframe#context of Karma, which is enabled through client.useIframe (see the configuration guide). This will also wrap the debug context to run inside the iframe#context.

To run tests within a custom, separate context, e.g. iframe#viewport:

// karma.conf.js
module.exports = function(config) {
  config.set({
    frameworks: ["viewport"]

    // Viewport configuration
    viewport: {
      context: "#viewport"
    }
  })
}

Note that the iframe#viewport element must be present in the context.html and debug.html files that are served by Karma. Using a separate, custom context makes it possible to load entire webpages for testing:

beforeEach(done => {
  viewport.load("/path/to/fixture.html", done)
})

config.viewport.breakpoints

For easier, and less repetitive testing, named breakpoints can be easily set:

// karma.conf.js
module.exports = function(config) {
  config.set({
    frameworks: ["viewport"]

    // Viewport configuration
    viewport: {
      breakpoints: [
        {
          name: "mobile",
          size: {
            width: 320,
            height: 480
          }
        },
        {
          name: "tablet",
          size: {
            width: 768,
            height: 1024
          }
        },
        {
          name: "screen",
          size: {
            width: 1440,
            height: 900
          }
        }
      ]
    }
  })
}

The viewport dimensions can then be set using the names of the breakpoints:

// Set to 320px x 480px
viewport.set("mobile")

// Set to 1440px x 900px
viewport.set("screen")

// Reset to 100% x 100%
viewport.reset()

Furthermore, breakpoints can be iterated:

// Run tests for mobile, tablet and screen
viewport.each(name => {
  // ...
})

// Run tests for tablet and screen
viewport.from("tablet", name => {
  // ...
})

// Run tests for mobile and tablet
viewport.to("tablet", name => {
  // ...
})

// Run tests for tablet and screen
viewport.between("tablet", "screen", name => {
  // ...
})

After breakpoint iteration, viewport.reset() is called internally.

License

MIT License

Copyright (c) 2017-2018 Martin Donath

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.