52 lines
2 KiB
Rust
52 lines
2 KiB
Rust
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//! Deterministic byte-stability for the `state.ncl` renderer (O1.5 / D9).
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//!
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//! The renderer is invoked twice on the same input; the two outputs MUST
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//! be byte-identical. Failure would indicate a non-deterministic source
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//! such as iteration over an unordered collection or use of a clock.
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use std::path::{Path, PathBuf};
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use std::process::Command;
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use ontoref_ontology::render::render_state_ncl;
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use ontoref_ontology::types::StateConfig;
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/// Project root that holds the `.ontoref/` spine.
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///
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/// Walks up from this crate until it finds the directory containing `.ontoref/`.
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/// Post-ADR-048 (constellation) the spine sits at the constellation parent,
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/// outside `code/`; pre-ADR-048 it was inside the workspace. Searching ancestors
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/// resolves it under either layout instead of hard-coding a hop count.
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fn workspace_root() -> PathBuf {
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PathBuf::from(env!("CARGO_MANIFEST_DIR"))
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.ancestors()
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.find(|dir| dir.join(".ontoref").is_dir())
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.map(Path::to_path_buf)
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.expect("a `.ontoref/` spine must exist in an ancestor of CARGO_MANIFEST_DIR")
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}
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fn nickel_export_state(path: &Path) -> StateConfig {
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let output = Command::new("nickel")
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.arg("export")
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.arg("--format")
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.arg("json")
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.arg(path)
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.output()
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.expect("nickel binary must be on PATH for this test");
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assert!(output.status.success(), "nickel export failed");
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serde_json::from_slice(&output.stdout).expect("StateConfig parse")
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}
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#[test]
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fn repeated_render_produces_identical_bytes() {
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let root = workspace_root();
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let source = ontoref_ontology::layout::resolve_section(&root, "ontology/state.ncl");
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let state = nickel_export_state(&source);
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let first = render_state_ncl(&state);
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let second = render_state_ncl(&state);
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let third = render_state_ncl(&state);
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assert_eq!(first, second, "render is not deterministic across two calls");
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assert_eq!(second, third, "render is not deterministic across three calls");
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}
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