Valid inputs
Fixtures cover strings, mappings, sequences, nesting, comments, whitespace, Unicode, line endings, and empty values.
Conformance
One corpus, matching behavior.
Nano Markup implementations are tested against a shared conformance corpus so Python, Go, JavaScript, TypeScript, Dart, and Java agree on valid documents, invalid documents, and writer output.
Before implementing, review the specification design and learn the format.
Coverage
What conformance checks
Invalid inputs
Error fixtures cover malformed indentation, forbidden characters, duplicate keys, invalid escapes, and syntax mistakes.
Writer output
Writer fixtures verify stable encoded output and cross-read behavior across implementations.
Source of truth
Use the shared test suite
The specification repository contains the conformance fixtures, validation tools, and coverage notes used by the stable implementations.