[Vuejs]-How to test if a button is displayed in vue

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Using async JS as we’ll wait for the components to be re-rendered by Vue.

it('should not allow sign in', async () =>{

…

await wrapper2.vm.$nextTick()
expect(wrapper2.find('#logout').hasStyle('display', 'none')).toBe(true)

…

Edit
.hasStyle has since been deprecated!

expect(wrapper.element.style.display).toBe('none');