Icechunk-ERA5: a daily updating, performance-optimized ARCO data cube, with 86 years of 43 surface and pressure-level variables. Available now on the Earthmover Data Marketplace .

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#hypothesis

2 posts

Ship fast, break nothing: Engineering rigor in Icechunk with cross-version stateful compatibility testing

Ship fast, break nothing: Engineering rigor in Icechunk with cross-version stateful compatibility testing

May 21, 2026

How we used third-wheel and Hypothesis to interleave Icechunk 1.x and 2.x in a single stateful test — and the bugs that fell out.

Ian Hunt-Isaak

Ian Hunt-Isaak

Xarray Community Developer

Ship fast, break nothing: Engineering rigor in Icechunk with property and stateful testing

Ship fast, break nothing: Engineering rigor in Icechunk with property and stateful testing

April 22, 2026

How we engineer rigor into Icechunk and its upstream brethren using property and stateful testing techniques. Also, a cautionary tale.

Deepak Cherian

Deepak Cherian

Forward Deployed Engineer

Sebastian Galkin

Sebastian Galkin

Staff Engineer

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