Skills for testing and debugging: reproducing failures, writing tests, inspecting stack traces and confirming root causes.
Works through bugs in four phases, root cause investigation, pattern analysis, hypothesis testing and implementation, fixing causes, not symptoms.
Builds features and fixes bugs test-first in a red-to-green loop, testing behavior only at public seams agreed with the user.
Playwright E2E testing patterns covering Page Object Model, configuration, CI/CD integration, artifact management and flaky test strategies.
Tests local web applications with native Python Playwright scripts, capturing screenshots and browser logs, with a helper that manages servers.
Tests a site, API or CLI, then fixes the bugs it finds in severity order, each with a regression test and its own commit.
Diagnoses ambiguous failures by gathering evidence and ranking hypotheses before any product code is changed.
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