message: test: add test for observer lazy getter invocation
diff: @@ -355,4 +355,18 @@ describe('Observer', () => {
  expect(obj.__ob__ instanceof Observer).toBe(true)
  })
  })
  +
  + it('should lazy invoke existing getters', () => {
  + const obj = {}
  + let called = false
  + Object.defineProperty(obj, 'getterProp', {
  + enumerable: true,
  + get: () => {
  + called = true
  + return 'some value'
  + }
  + })
  + observe(obj)
  + expect(called).toBe(false)
  + })
  })
  