Minor cleanups/fixes in test runner stability

Author: swernerx

test/esnext-fail/index.test.js

@@ -18,5 +18,5 @@ test("Publish Test File via Babel", async () => {
     preppy({
       cwd: __dirname
     })
-  ).rejects.toThrow('Unexpected token, expected ";" (2:17)')
+  ).rejects.toThrow('Missing semicolon')
 })

test/util.js

@@ -1,11 +1,10 @@
 import execa from "execa"
 
-export async function preppy(options) {
+export function preppy(options) {
   const { cwd, ...rest } = options
   const opts = { cwd }
 
   const args = Object.keys(rest).map((key) => `--${key}=${rest[key]}`)
 
-  const result = await execa("../../bin/preppy", args, opts)
-  return result.exitCode
+  return execa("../../bin/preppy", args, opts)
 }