sinon-with-objects.js

const sinon = require('sinon')

const componentIWantToMock = {
  functionIWantToMock: function() {}
}

const componentThatUsesMock = {
  someFunction: function(mock) {
    mock.functionIWantToMock()
  }
}

const mockComponent = sinon.mock(componentIWantToMock)
mockComponent.expects('functionIWantToMock').once()

componentThatUsesMock.someFunction(componentIWantToMock)

mockComponent.verify()