Achieving 100% Determinism in NVIDIA Isaac Sim for Regression Testing

A flaky test in web development is annoying. A flaky test in robotics simulation causes engineers to distrust automated validation entirely.

To make automated simulation suitable for CI gates, test results must be 100% reproducible. Given identical code and an identical scenario seed, the robot must produce the exact same kinematic trajectory and sensor telemetry.

In this technical guide, we detail how ARTE locks fixed physics sub-stepping in PhysX 5, handles asynchronous ROS 2 executor queues, and creates zero-drift deterministic validation suites.