vue-test-utils 1.0.0-beta.16 setData Error

[OneIsAll-L]

First of all, thanks to Eddyyerburgh's help.But I still have problems after trying:
This is my package file：

This is my import file：

And I tried two ways：
One kind
it('setData()方法', () => { const wrapper = mount(Counter) wrapper.setData({foo: 'bar'}) expect(wrapper.data().foo).to.equal('bar') })
The other
it('setData()方法', () => { const wrapper = mount(Counter) wrapper.setData({foo: 'bar'}) expect(wrapper.vm.foo).to.equal('bar') })
However, it still prompts different errors：
The first erroris: TypeError: wrapper.data is not a function
at Context. (webpack:///test/unit/specs/Counter.spec.js:81:19 <- index.js:12255:20)
The second:AssertionError: expected undefined to equal 'bar'
at Context. (webpack:///test/unit/specs/Counter.spec.js:81:30 <- index.js:12255:31)

I hope to find the cause of the problem and solve it as soon as possible with your help.