Fix synchronous util used in tests testing return of forEach and forEachStrict

Author: wojtekmaj

src/forEach.spec.js

@@ -76,7 +76,7 @@ describe('asyncForEach()', () => {
   });
 
   it('returns undefined', async () => {
-    const [, pushDuplicate] = makePushDuplicate();
+    const [, pushDuplicate] = makePushDuplicateInRandomTime();
     const mapper = jest.fn().mockImplementation(pushDuplicate);
 
     const result = await asyncForEach(inputArr, mapper);

src/forEach_strict.spec.js

@@ -102,7 +102,7 @@ describe('asyncForEachStrict()', () => {
   });
 
   it('returns undefined', async () => {
-    const [, pushDuplicate] = makePushDuplicate();
+    const [, pushDuplicate] = makePushDuplicateInRandomTime();
     const mapper = jest.fn().mockImplementation(pushDuplicate);
 
     const result = await asyncForEachStrict(inputArr, mapper);