Deterministic Multithreaded Testing in Python with blanket

<div class='alert alert-info'> <p class='alert-title'><i class='fa-solid fa-circle-info' aria-hidden='true'></i> TLDR:</p> <ul> <li><a href='#why-multithreaded-python-tests-are-flaky'><strong>The problem</strong></a> : testing multithreaded code is hard because the OS scheduler decides which thread runs when, making race conditions all but impossible to reproduce in a test suite.</li> <li><a…