---
title: "Discussion on \"Resetting Mock State Between Tests for Real Isolation\" | Hashnode"
description: "Discussion on \"Resetting Mock State Between Tests for Real Isolation\". Isolate stateful mock tests by resetting to a baseline in setup, using disposable instances or unique contexts, and proving it with randomized and parallel runs."
url: "https://hashnode.com/posts/reset-mock-state-between-tests-isolation/6ae809c7343f9333b83ed5cb"
---

[Feed](https://hashnode.com/feed) /

Discussion

# [Resetting Mock State Between Tests for Real Isolation](https://blogs.powerduck.com/reset-mock-state-between-tests-isolation?utm_source=hashnode&utm_medium=feed)

Isolate stateful mock tests by resetting to a baseline in setup, using disposable instances or unique contexts, and proving it with randomized and parallel runs.

Nov 2 · 5 min read · blogs.powerduck.com  
Read the article

-   [#mocking](https://hashnode.com/tag/mocking)
-   [#api](https://hashnode.com/tag/api)
-   [#developers](https://hashnode.com/tag/developers)

## Written by

[Powerduck](https://hashnode.com/@powerduck)

@powerduck · hon

  
[View profile](https://hashnode.com/@powerduck)

## Responses 1

Markdown supported · ⌘↵ to post

[Mateo Ruiz](https://hashnode.com/@mateoruiz)

[Nov 2](https://hashnode.com/posts/reset-mock-state-between-tests-isolation/6ae809c7343f9333b83ed5cb/comment/6ae82bd611447caa302aa06c)

One subtle issue worth watching is that resetting the mock doesn't automatically guarantee isolation if tests share external identifiers or asynchronous requests are still in flight.

For example, a delayed request from one test could arrive after `beforeEach` has reset the mock and contaminate the next test's request history or scenario state. I'd make sure each test waits for its interactions to settle before cleanup, and use unique context IDs where possible. Randomized execution catches ordering dependencies, but repeated parallel runs are especially useful for exposing these timing-related leaks.