Fixing prototype methods being discarded when using setData

[rory-instil]

Currently when calling setData on a wrapper it will not retain methods on any constructed objects passed in. These methods reside in the prototype which the current logic do not persist across. These changes will ensure that any prototype properties / methods are copied over to the proxied data object.

fixes #1851

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[cexbrayat]

LGTM, thanks @rory-instil 👍

[cexbrayat]

Maybe the initial value should be something else to see if setData properly updates it no?

[rory-instil]

As in a different class altogether?
Or just with some properties on the class that get changed?

[rory-instil]

for example:

it('should retain prototype methods for constructed objects when calling setData', async () => {
  const expectedResult = 'success!'
  class TestClass {
    name: string
    constructor(name: string) {
      this.name = name
    }
    getResult(): string {
      return expectedResult
    }
  }

  const wrapper = mount(
    defineComponent({
      template: '<div/>',
      data() {
        return { value: new TestClass('test1') }
      },
      methods: {
        getResult() {
          return `${this.value.name}: ${this.value.getResult()}`
        }
      }
    })
  )

  expect(wrapper.vm.getResult()).toStrictEqual(`test1: ${expectedResult}`)

  await wrapper.setData({
    value: new TestClass('test2')
  })

  expect(wrapper.vm.getResult()).toStrictEqual(`test2: ${expectedResult}`)
})

[cexbrayat]

Yes, this looks good 👍
(nit: as it is TS, you can use constructor(private name: string))

[cexbrayat]

Thanks for the help @rory-instil !