Make error catcher return an async function

Author: flekschas

tests/utils.js

@@ -58,9 +58,9 @@ export const wait = (milliSeconds) =>
 
 export const capitalize = (s) => `${s[0].toUpperCase}${s.slice(1)}`;
 
-export const catchError = (testFn) => (t) => {
+export const catchError = (testFn) => async (t) => {
   try {
-    testFn(t);
+    await testFn(t);
   } catch (e) {
     t.fail(e.message);
   }