OneCAD/docs/book/src/dev/testing.md

Test harnesses

cargo xtask ci runs everything a pull request must pass: fmt, xtask assets, xtask licences --check, xtask layers, clippy with -D warnings, the tests with the ci profile and the wasm build check.

Harness	Where	What it catches
Unit and engine tests	next to the code, *_tests.rs	measured results: volume, area, topology counts against derived values
Hostile input	hostile_params_never_panic, crates/engine/src/tests.rs	every command × every documented parameter × junk values: errors, never panics
Sketch fuzz	crates/engine/src/cmd/sketch_fuzz_tests.rs	random sketches through the solver and profile finder
UI scenarios	crates/ui-egui/tests/scenarios/*.json	the real app, headless: clicks, keys, drags, assertions
Layout tests	crates/ui-egui/tests/ui_layout.rs, window_widths.rs	panels and dialogs at every window width
Design-file corpus	apps/solvecraft-cli/tests/corpus	every saved file version still opens and evaluates the same
Kill mid-save	apps/solvecraft-cli/tests/kill_mid_save.rs	a save killed at any moment leaves a readable file
Reference tests	cargo xtask oracle → docs/oracle.md	parts rebuilt from tests/oracle/*/recipe.json, compared with analytic or FreeCAD expected values

UI scenarios

A scenario is a JSON list of steps run against the real app with a headless egui context:

[
  {"start": "sketch.create"},
  {"click": {"plane": "XY"}},
  {"start": "sketch.rectangle.two_point"},
  {"click": {"sketch": [0, 0]}},
  {"click": {"sketch": [40, 30]}},
  {"expect": {"errors": 0}}
]

A new file in crates/ui-egui/tests/scenarios/ is picked up automatically. To record a bug before it's fixed, add a {"pending": "why"} step; its test is then ignored with that reason, and the fix removes the step.

CI profile

CI runs the tests with --profile ci: light optimisation, line tables, no LTO and debug assertions off. Some truck debug assertions fail on valid geometry; the ci profile disables them while building faster than --release. If a test fails only in a plain debug build, say so in the PR.

Run cargo xtask test to build with this profile and run the test binaries concurrently, with doc tests alongside. Arguments after -- go to each test binary, for example cargo xtask test -- shell. To run the test binaries sequentially instead, use cargo test --workspace --profile ci.

CI sharding and heavy tests

On GitHub, one job builds the tests into a cargo-nextest archive and four jobs run a quarter of the tests each (--partition slice:N/4, settings in .config/nextest.toml); doc tests run in their own job. Pull requests skip a few heavy tests (each takes one to four minutes); they run on every push to main, nightly, and in cargo xtask test:

• solvecraft-engine: tests::hostile_params_never_panic, everything in tests::robustness, pattern_suppress_tests::enclosure_arc_extinction_keeps_a_real_sharp_inner_lip_after_resize_and_reopen, pattern_suppress_tests::enclosure_datums_follow_wall_height_and_board_depth_with_material_proofs, cmd::plastic::tests::enclosure_snap_fit_follows_resized_front_wall
• solvecraft-kernel: tests::boolean_identity_on_tangent_primitives
• solvecraft-ui-egui scenarios: acceptance_sensor_enclosure

To run exactly what a pull request runs: cargo nextest run --cargo-profile ci --profile ci; add --ignore-default-filter for the full set. A new test that takes over a minute on CI can join the list (the default-filter in .config/nextest.toml) if it guards robustness rather than everyday behaviour.