import { assertThrows } from "https://dotland.deno.dev/x/dotenv@v3.2.2/test_deps.ts";
Executes a function, expecting it to throw. If it does not, then it throws. An error class and a string that should be included in the error message can also be asserted. Or you can pass a callback which will be passed the error, usually to apply some custom assertions on it.