[Vuejs]-Vue.js unit test that html content does not exist

I think you’ll be better using text instead of html, in that way your current test would be:

expect(wrapper.text()).toBe('Some specific placeholder')

and the one checking for no rendered text can be like this:

expect(wrapper.text()).toBe('')

or

expect(wrapper.text()).not.toBe('Some specific placeholder')

depending on your specific scenario.