bootstrap-vue/src/utils/config-defaults.spec.js

BootstrapVue, with over 40 plugins and more than 80 custom components, custom directives, and over 300 icons, provides one of the most comprehensive implementations of Bootstrap v4 components and grid system for Vue.js. With extensive and automated WAI-AR

import DEFAULTS from './config-defaults'

describe('utils/config-defaults', () => {
  it('default configuration is immutable', async () => {
    // Existing properties cannot be mutated
    expect(DEFAULTS.breakpoints).toEqual(['xs', 'sm', 'md', 'lg', 'xl'])
    try {
      DEFAULTS.breakpoints = 'foobar'
    } catch {}
    expect(DEFAULTS.breakpoints).toEqual(['xs', 'sm', 'md', 'lg', 'xl'])

    // Nested array properties cannot be mutated
    expect(DEFAULTS.breakpoints[0]).toEqual('xs')
    try {
      DEFAULTS.breakpoints[0] = 'foobar'
    } catch {}
    expect(DEFAULTS.breakpoints[0]).toEqual('xs')
    expect(DEFAULTS.breakpoints).toEqual(['xs', 'sm', 'md', 'lg', 'xl'])

    // Nested object properties cannot be mutated
    expect(DEFAULTS.BAlert.variant).toEqual('info')
    try {
      DEFAULTS.BAlert.variant = 'foobar'
    } catch {}
    expect(DEFAULTS.BAlert.variant).toEqual('info')

    // New Properties cannot be added
    expect(DEFAULTS.foobar).not.toBeDefined()
    try {
      DEFAULTS.foobar = 'foobar'
    } catch {}
    expect(DEFAULTS.foobar).not.toBeDefined()
    expect(DEFAULTS.BAlert.foobar).not.toBeDefined()
    try {
      DEFAULTS.BAlert.foobar = 'foobar'
    } catch {}
    expect(DEFAULTS.BAlert.foobar).not.toBeDefined()

    // Properties cannot be deleted
    expect(DEFAULTS.BAlert).toBeDefined()
    try {
      delete DEFAULTS.BAlert
    } catch {}
    expect(DEFAULTS.BAlert).toBeDefined()
  })
})