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

With more than 85 components, over 45 available plugins, several directives, and 1000+ icons, BootstrapVue provides one of the most comprehensive implementations of the Bootstrap v4 component and grid system available for Vue.js v2.6, complete with extens

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()
  })
})