JSON fixture payloads
The JSON fixtures hold the template, destination, expected result, diagnostics, manifests, and transport examples.
Conformance corpus
Fixtures make rulesets executable.
Fixtures carry the concrete inputs and expected outputs that prove a ruleset meaning is viable across implementations.
Ruleset mirror files
Merge-output fixtures pair with .smrules files under structuredmerge-fixtures/rulesets/, mirroring the JSON fixture path.
Shared validation
Go, TypeScript, Rust, and Ruby parse the same .smrules corpus and reject malformed edge cases, giving the same deterministic result matrix before a CLI is introduced.