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lambert_izzo_test_support

Workspace-internal dev fixtures for lambert_izzo. Not published (publish = false) and not stable — no semver guarantees on its public surface. Used as a [dev-dependencies] path crate by the core's examples, benches, and tests.

What's in it

  • bodies — SI astrodynamics constants: MU_EARTH, MU_SUN, AU.
  • rand_unit_vec — uniform-on-sphere unit-vector helper via rejection sampling on the unit cube.
  • random_inputs — deterministic LambertInput batch generator (Spec, generate, WayStrategy). Seeded with ChaCha20Rng so benches and stress runs are reproducible.
  • kepler::propagate — universal-variable / Stumpff Kepler propagator used to round-trip Lambert solutions in the stress example and in tests/kepler_roundtrip.rs.
  • elements_u64 — usize → u64 converter for criterion::Throughput::Elements, casting policy-compliant.

Why a separate crate?

Keeps lambert_izzo itself dependency-free at runtime: nothing here (rand, rand_chacha, the SI constants) leaks into the published crate. The core can stay no_std while the examples / benches use the real std test scaffolding.

Bar for changes

Anything added here should pass the bar for lambert_izzo proper — casting policy, no unwrap/expect/panic! outside test assertions, explanatory /// doc comments on every public item — even though this crate isn't published.