Edward Langley
aadf5ddd35
Review of #202 showed `cargo metadata --no-deps --locked` exits 0 against a stale lockfile, so the flag promised a check it does not make. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VdfEGXA7aJ6ftMsCc9PJze
62 lines
2.4 KiB
Rust
62 lines
2.4 KiB
Rust
//! A number read through serde_json must be the number written (improvise-6yvg,
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//! improvise-dz8c). The rule and its derivation: `context/code/protocol.md`.
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use serde_json::Value;
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/// Every NORMAL serde_json dependency in the workspace, and those lacking
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/// `float_roundtrip`, each spelled `package (target)`.
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fn lossy_json_dependencies(metadata: &Value) -> (Vec<String>, Vec<String>) {
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let mut checked = vec![];
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let mut lossy = vec![];
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let packages = metadata["packages"]
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.as_array()
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.expect("metadata lists packages");
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for package in packages {
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let name = package["name"].as_str().expect("a package has a name");
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let deps = package["dependencies"]
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.as_array()
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.expect("a package lists deps");
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for dep in deps {
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if dep["name"] != "serde_json" || !dep["kind"].is_null() {
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continue;
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}
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let target = dep["target"].as_str().unwrap_or("all targets");
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let spelled = format!("{name} ({target})");
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let features = dep["features"].as_array().expect("a dep lists features");
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if !features.iter().any(|f| f == "float_roundtrip") {
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lossy.push(spelled.clone());
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}
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checked.push(spelled);
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}
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}
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(checked, lossy)
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}
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/// Derived from `cargo metadata`, not listed: a new crate that can parse JSON
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/// is covered the day it declares the dependency. Evidence file.
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#[test]
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fn every_crate_that_can_parse_json_enables_float_roundtrip() {
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let out = std::process::Command::new(env!("CARGO"))
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.current_dir(env!("CARGO_MANIFEST_DIR"))
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.args(["metadata", "--no-deps", "--format-version", "1"])
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.output()
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.expect("cargo metadata must run");
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assert!(
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out.status.success(),
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"cargo metadata failed: {}",
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String::from_utf8_lossy(&out.stderr)
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);
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let metadata: Value = serde_json::from_slice(&out.stdout).expect("metadata is JSON");
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let (checked, lossy) = lossy_json_dependencies(&metadata);
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assert!(
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checked.len() >= 2,
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"the derivation found {checked:?}: too few to be reading the metadata right"
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);
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assert!(
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lossy.is_empty(),
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"these parse JSON numbers with serde_json's lossy default, one ULP off \
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for roughly one decimal in seven; add features = [\"float_roundtrip\"] \
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to each crate's own manifest: {lossy:?}"
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);
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}
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