Parity Testing

Because Python and JavaScript serialize to the same IR, a chart built in either language should render pixel-identically. Parity testing enforces that. This essay will document the workflow and its CI wiring.

Planned contents

• How parity is captured and compared (JS DOM snapshots vs. Python-built charts).
• The story/example format parity tests expect.
• Common failure modes and how to triage them.
• CI wiring: the python-parity job depends on the visual-test job, so a JS visual regression skips parity entirely — worth knowing when a parity run looks "green".

Source

Likely covers:: the parity test harness under tests/ and packages/gofish-python/tests/. Add the covers: frontmatter when writing this up, then run pnpm --filter docs sync-backlinks.