chai code snippets in typescript

create a test case using `vue-test-utils` and `chai` for a vue 3 plugin, to see that it get's installed ok and an app can mount and display a message via a property in typescript

create a unit test, with chai and sinon available, that will mock or spyon setinterval so that any function under test that may invoke setinterval will not hold the suite running in typescript

how to test a function throws an error using chai and sinon in typescript