toy data - make deterministic for parallelization

[atravitz]

resolves #215

PR Author Checklist

• added news item, or changes are not user-facing
• pre-commit CI passes (comment pre-commit.ci autofix to auto-format your PR).

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• I certify that this contribution is covered by the MIT License here and the Developer Certificate of Origin at https://developercertificate.org/.

Reviewer Checklist

• news entry has been added if necessary
• pre-commit auto fix has been run
• any API breaks have been documented

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.31%. Comparing base (8103e3d) to head (6a817aa).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #216      +/-   ##
==========================================
- Coverage   92.33%   92.31%   -0.03%     
==========================================
  Files          84       84              
  Lines        2634     2627       -7     
==========================================
- Hits         2432     2425       -7     
  Misses        202      202              

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[mikemhenry]

LGTM!