---
title: "David Khourshid"
description: "David Khourshid teaches state machines with XState and argues for model-based and property-based testing."
group: person
terms:
  - "David Khourshid"
  - "David K"
sources:
  - https://css-tricks.com/model-based-testing-in-react-with-state-machines/
  - https://frontendmasters.com/courses/xstate-v2/testing/
  - https://stately.ai/docs/graph
  - https://x.com/davidkpiano/status/2105670489091834297
---

# David Khourshid

David Khourshid wrote [Model-Based Testing in React with State Machines](https://css-tricks.com/model-based-testing-in-react-with-state-machines/) for CSS-Tricks in 2019. It explains how to generate tests from a state machine instead of writing each case by hand.

In the testing lesson of his Frontend Masters course on XState, he describes a test model as "a state machine, and the state machine represents all of your given when then statements in a single state machine." He adds that model-based testing lets you "test any application whether they're using state machines or not." [Testing, State Machines in JavaScript with XState, v2](https://frontendmasters.com/courses/xstate-v2/testing/)

XState carries that idea in `xstate/graph` with `createTestModel` and `getShortestPaths`. [Graph & Paths](https://stately.ai/docs/graph)

On 2026-10-01 he told Joel, "I need to get you on the MBT/PBT train." [X](https://x.com/davidkpiano/status/2105670489091834297) This repo took the ride: see [model-based testing](/lore/model-based-testing) and [property-based testing](/lore/property-based-testing).

## Lore on this page

- [Model-based testing](/lore/model-based-testing)
- [Property-based testing](/lore/property-based-testing)