why does this test return 'Vue is not defined'

I’m working on a simple Vue component in a codesandbox. The codesandbox picks up the test.js file that I’ve created but running the test returns the following error:

“There was an error while evaluating the file:
Vue is not defined”

nice-firefly-wls69e - CodeSandboxtests/MatchbackCheckbox.test.js

It’s about the most simple test possible. Any idea what I might be missing here? Is there an additional dependency that I need to add to the codesandbox?