# Physics engine tests?

**URL:** <https://forum.makecode.com/t/physics-engine-tests/509>\
**Category:** Arcade\
**Created:** [September 2, 2019, 11:02pm UTC](https://forum.makecode.com/t/physics-engine-tests/509 "2019-09-02T23:02:15Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![kjw](https://avatars.discourse-cdn.com/v4/letter/k/e79b87/32.png) [@kjw](https://forum.makecode.com/u/kjw)\
**Post date:** [September 16, 2019, 5:32pm UTC](https://forum.makecode.com/t/physics-engine-tests/509/5 "2019-09-16T17:32:24Z")

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I’ve done some more testing in this space in light of the “tight maze issues” noted in [Maze tile map navigation issues](https://forum.makecode.com/t/maze-tile-map-navigation-issues/484).

The tests in the program below are not exactly the same but they do test a few areas with lateral velocity and accelation. There are currently 7 failures on one type of test, it only “scores” 89 (out of 96) on `v0.14.9`.

![arcade-Physics-Maze-UnitTest-v1-sim-video-1](https://us1.discourse-cdn.com/flex020/uploads/makecode/original/1X/e1f66f0059be93c253357a40fd849bd13d8849d5.gif)

 ![arcade-Physics-Maze-UnitTest-v1-screenshot-codecrop1](https://us1.discourse-cdn.com/flex020/uploads/makecode/original/1X/a586a927c63f6fd6c409fd3790a0c9603f3ee9e1.png)

![arcade-Physics-Maze-UnitTest-v1](https://us1.discourse-cdn.com/flex020/uploads/makecode/original/1X/c08ff030f0538a3c9c55b341645efd7c80be23c8.png)

In addition to a headless mode perhaps a mode that keeps the simulator’s time slices at a fixed, non-adaptive rate would be good for testing. That would allow for reproducible results from the simulator regardless of load on the test host and performance of the interpreter.

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