Sets Wrapper vm data.
setData works by merging existing properties, except for arrays which are overwritten.
Note the Wrapper must contain a Vue instance.
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Arguments:
{Object} data
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Example:
import { mount } from '@vue/test-utils'
import Foo from './Foo.vue'
const wrapper = mount(Foo)
wrapper.setData({ foo: 'bar' })
expect(wrapper.vm.foo).toBe('bar')