vue2/test/unit/specs/observer/dep_spec.js

var Dep = require('src/observer/dep')

describe('Dep', function () {
  var d
  beforeEach(function () {
    d = new Dep()
  })

  it('addSub', function () {
    var sub = {}
    d.addSub(sub)
    expect(d.subs.length).toBe(1)
    expect(d.subs.indexOf(sub)).toBe(0)
  })

  it('removeSub', function () {
    var sub = {}
    d.addSub(sub)
    d.removeSub(sub)
    expect(d.subs.length).toBe(0)
    expect(d.subs.indexOf(sub)).toBe(-1)
  })

  it('notify', function () {
    var sub = {
      update: jasmine.createSpy('sub')
    }
    d.addSub(sub)
    d.notify()
    expect(sub.update).toHaveBeenCalled()
  })
})