Files
vectorcraft/crates/engine/tests/command_sweep.rs
T
bflatasticandClaude Opus 5.5 377f236687 Fix #483: Shift-drag marquees toggle the selection; the Lasso's Alt keeps the rest
A Shift-drag marquee only ever added to the selection, so there was no way to
take some of the selected objects out with it. As in Illustrator, Shift-drag
now toggles what the marquee reaches: the selected ones are deselected, the
others selected, the rest of the selection stays.

- Selection tool: the Shift marquee runs select.toggle, which now also takes
  {ids} (each one toggles).
- Direct Selection and Group Selection: the Shift marquee toggles the anchors
  inside it (select.anchorsMany mode "toggle"); a path left with none leaves
  the selection, one with all of them is selected whole again.
- select.anchorsMany takes mode "set"|"add"|"toggle"|"subtract" (add: true is
  still mode add). Adding anchors of a path selected whole keeps it whole, and
  anchor references outside the path are ignored.
- Lasso: Shift adds and Alt subtracts through the same command, so an Alt lasso
  no longer drops selected type, groups and other non-path objects.
- Tests at the tool, engine (Session::pointer) and MCP (pointer_gesture) levels,
  command sweep cases for the new modes; docs/mcp.md and ROADMAP.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-10-08 20:21:36 +07:00

447 lines
22 KiB
Rust
Raw Blame History

This file contains ambiguous Unicode characters
This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.
//! Every-command sweep: each registered command, in three fixture states, with `{}` and with fuzzed
//! junk params, must return Ok or Err (never panic), never leave an interaction open, and never
//! corrupt the tree.
// Integration tests: unwrapping and panicking on failure is fine here, unlike in shipped code (AGENTS.md › Robustness).
#![allow(clippy::unwrap_used, clippy::expect_used, clippy::panic)]
use serde_json::{Value, json};
use vectorcraft_engine::{Session, command_specs};
use vectorcraft_testkit::catch_quiet;
use vectorcraft_testkit::fixtures::Fixture;
use vectorcraft_testkit::invariants::{check_all, check_session, doc_json};
use vectorcraft_testkit::strategies::{junk_params, junk_values, param_keys};
/// Commands that replace/close the active document or touch the filesystem are fine to call, but a
/// few need their paths redirected into a temp dir (handled by `junk_params`).
fn safe_path() -> String {
vectorcraft_testkit::temp_dir("sweep").join("out.bin").to_string_lossy().to_string()
}
/// Run one call; returns a failure description or None.
fn probe(fx: Fixture, id: &str, params: &Value) -> Option<String> {
let mut s = fx.session();
let r = catch_quiet(|| s.execute(id, params));
match r {
Err(msg) => Some(format!("PANIC {id} {params} [{fx:?}]: {msg}")),
Ok(_) => {
if s.in_interaction() {
return Some(format!("{id} {params} [{fx:?}]: left an interaction open"));
}
check_session(&s).err().map(|e| format!("{id} {params} [{fx:?}]: {e}"))
}
}
}
#[test]
fn registry_is_well_formed() {
let specs = command_specs();
assert!(specs.len() > 150, "only {} commands", specs.len());
let mut ids = std::collections::HashSet::new();
for c in specs {
assert!(ids.insert(c.id), "duplicate command id {}", c.id);
assert!(!c.label.is_empty(), "{} has no label", c.id);
assert!(c.params.starts_with('{') || c.params.starts_with("same as"), "{}: params doc `{}`", c.id, c.params);
assert!(c.id.contains('.'), "{}: ids are namespaced", c.id);
}
// Every command reports enablement without a document.
let s = Session::new();
for info in s.commands() {
assert_eq!(info.enabled, info.disabled_reason.is_none(), "{}", info.id);
}
}
#[test]
fn every_command_with_empty_params_in_every_fixture() {
let mut failures = vec![];
for fx in Fixture::ALL {
for c in command_specs() {
if let Some(f) = probe(fx, c.id, &json!({})) {
failures.push(f);
}
}
}
assert!(failures.is_empty(), "{} failures:\n{}", failures.len(), failures.join("\n"));
}
#[test]
fn every_command_without_a_document() {
let mut failures = vec![];
for c in command_specs() {
let mut s = Session::new();
match catch_quiet(|| s.execute(c.id, &json!({}))) {
Err(p) => failures.push(format!("PANIC {} with no document: {p}", c.id)),
// Anything that needs a document must say so via enablement, not fail later.
Ok(Err(vectorcraft_engine::EngineError::NoDocument)) => failures.push(format!("{}: enabled without a document but needs one", c.id)),
Ok(_) => {}
}
if s.in_interaction() {
failures.push(format!("{}: interaction left open", c.id));
}
}
assert!(failures.is_empty(), "{}", failures.join("\n"));
}
/// Known bugs (see the `#[ignore]` repro tests below): (command, param key) pairs skipped by the
/// junk sweep so the rest of the sweep stays meaningful.
const KNOWN_BUGS: &[(&str, &str)] = &[
("object.scale", "sx"),
("object.transformEach", "scaleH"),
("object.transformEach", "scaleV"),
("object.distributeSpacing", "spacing"),
("artboard.setProps", "x"),
("artboard.setProps", "y"),
("artboard.setProps", "width"),
("artboard.setProps", "height"),
];
fn known_bug(id: &str, p: &Value) -> bool {
KNOWN_BUGS.iter().any(|(c, k)| *c == id && p.get(*k).is_some())
}
/// Regression: huge column counts used to panic with `capacity overflow`.
#[test]
fn artboard_rearrange_huge_columns() {
for fx in Fixture::ALL {
for cols in [json!(u64::MAX), json!(1e308)] {
let p = json!({ "columns": cols });
assert_eq!(probe(fx, "artboard.rearrange", &p), None);
}
}
}
#[test]
fn bug_huge_transform_makes_document_unloadable() {
for (id, p) in [
("object.scale", json!({"sx": 1e308})),
("object.transformEach", json!({"scaleH": 1e308})),
("object.distributeSpacing", json!({"spacing": 1e308})),
] {
let mut s = Fixture::Multi.session();
if s.execute(id, &p).is_ok() {
vectorcraft_testkit::invariants::check_native_roundtrip(&s.doc().unwrap().doc).unwrap_or_else(|e| panic!("{id} {p}: {e}"));
}
}
}
#[test]
fn bug_artboard_huge_props_break_svg() {
for key in ["x", "y", "width", "height"] {
let mut s = Fixture::Single.session();
let p = json!({"index": 0, key: 1e308});
if s.execute("artboard.setProps", &p).is_ok() {
vectorcraft_testkit::invariants::check_svg_roundtrip(&s.doc().unwrap().doc).unwrap_or_else(|e| panic!("{p}: {}", &e[..e.len().min(200)]));
}
}
}
/// Commands too slow to fuzz exhaustively get a reduced junk set (they still run).
fn heavy(id: &str) -> bool {
id.starts_with("document.serialize") || id.starts_with("document.export") || id == "document.open"
}
#[test]
fn every_command_with_junk_params() {
let path = safe_path();
let mut failures = vec![];
let mut calls = 0usize;
for fx in Fixture::ALL {
for c in command_specs() {
let mut cases = junk_params(c.params, &path);
if heavy(c.id) {
cases.truncate(12);
}
for p in &cases {
if known_bug(c.id, p) {
continue;
}
calls += 1;
if let Some(f) = probe(fx, c.id, p) {
failures.push(f);
}
}
}
}
assert!(calls > 5_000, "only {calls} calls");
failures.sort();
failures.dedup();
assert!(
failures.is_empty(),
"{} failures (of {calls} calls):\n{}",
failures.len(),
failures.iter().take(60).cloned().collect::<Vec<_>>().join("\n")
);
}
/// Junk inside the obvious structured params: ids arrays, anchors, matrices, colours, stops.
#[test]
fn structured_junk() {
let cases: Vec<(&str, Value)> = vec![
("select.set", json!({"ids": [0, u64::MAX, -1, "x", null, 1.5]})),
("select.add", json!({"ids": [[1], {"a": 1}]})),
("select.anchors", json!({"id": 2, "anchors": [[99, 99], [-1, 0], ["a", "b"]], "mode": "set"})),
("select.anchorsMany", json!({"items": [{"id": 2, "anchors": [[0, 1000]]}, null, 5]})),
("select.anchorsMany", json!({"items": [{"id": 2, "anchors": [[0, 1000], [0, 0]]}, {"id": u64::MAX}], "mode": "toggle"})),
("select.anchorsMany", json!({"items": [{"id": 2, "anchors": [[0, 0]]}], "mode": "subtract"})),
("select.anchorsMany", json!({"items": [], "mode": 7})),
("select.toggle", json!({"ids": [2, u64::MAX, "x"]})),
("object.transform", json!({"matrix": [0, 0, 0, 0, 0, 0]})),
("object.transform", json!({"matrix": [1e308, 1e308, 1e308, 1e308, 1e308, 1e308]})),
("object.transform", json!({"matrix": [1, 2, 3]})),
("object.scale", json!({"sx": 0, "sy": 0})),
("object.scale", json!({"sx": -100, "sy": 1e308})),
("object.rotate", json!({"angle": 1e308, "origin": [1e308, -1e308]})),
("object.distort", json!({"corners": [[0, 0], [0, 0], [0, 0], [0, 0]]})),
("object.distort", json!({"corners": [[0, 0]], "from": [0, 0, 0, 0]})),
("path.create", json!({"anchors": []})),
("path.create", json!({"anchors": [{"x": 1e308, "y": -1e308}, {"x": 0, "y": 0, "in": [1e308, 1e308]}], "closed": true})),
("path.create", json!({"d": "M 0 0 L"})),
("path.create", json!({"d": "M0 0 C 1e308 1e308 -1e308 -1e308 0 0 Z"})),
("path.create", json!({"d": "Z Z Z m 1 1 z"})),
("path.setAnchors", json!({"id": 2, "subpaths": [{"anchors": [], "closed": true}]})),
("path.setAnchors", json!({"id": 1, "subpaths": [{"anchors": [{"x": 0, "y": 0}], "closed": true}]})),
("path.insertAnchor", json!({"id": 2, "subpath": 0, "segment": 99, "t": 5})),
("path.insertAnchor", json!({"id": 2, "subpath": 7, "segment": 0, "t": -1})),
("path.setHandle", json!({"id": 2, "subpath": 0, "anchor": 100, "which": "in", "x": 0, "y": 0})),
("path.removeAnchor", json!({"id": 2, "subpath": 0, "anchor": 0})),
("path.split", json!({"id": 2, "subpath": 0, "segment": 1000, "t": 0.5})),
("path.reshapeSegment", json!({"id": 2, "subpath": 0, "segment": 0, "t": 2.0, "dx": 1e308, "dy": 0})),
("path.freehand", json!({"points": [[0, 0]]})),
("path.freehand", json!({"points": [[0, 0], [0, 0], [0, 0], [0, 0]]})),
("path.freehand", json!({"points": [[1e308, 1e308], [-1e308, 0]], "fidelity": 0})),
("path.curvature", json!({"points": [{"x": 0, "y": 0}]})),
("path.knife", json!({"points": [[0, 0], [1e9, 1e9]]})),
("path.eraseRegion", json!({"points": [[100, 80]], "size": 0})),
("path.eraseRegion", json!({"points": [[100, 80], [101, 80]], "size": 1e9})),
("path.blob", json!({"points": [[0, 0], [0, 0]], "size": -5})),
("path.smoothRegion", json!({"points": [[100, 80], [120, 90]], "radius": 1e308})),
("paint.setFill", json!({"gradient": {"stops": []}})),
("paint.setFill", json!({"gradient": {"stops": [{"offset": 0.5, "color": "#ff0000"}]}})),
(
"paint.setFill",
json!({"gradient": {"kind": "radial", "stops": [{"offset": -5, "color": [1, 0, 0]}, {"offset": 99, "color": {"gray": 50}}], "angle": 1e308}}),
),
("paint.setFill", json!({"color": [1e308, -1e308, 2]})),
("paint.setFill", json!({"color": {"c": 200, "m": -1, "y": 0, "k": 1e9}})),
("paint.setGradientGeom", json!({"start": [0, 0], "end": [0, 0]})),
("stroke.set", json!({"weight": -5, "dash": [0, 0, 0], "miterLimit": -1})),
("stroke.set", json!({"weight": 1e308, "dash": [-1, -2], "dashOffset": 1e308})),
("stroke.set", json!({"dash": [1e-12]})),
("transparency.set", json!({"opacity": -50})),
("transparency.set", json!({"opacity": 1e308, "blend": "NoSuchBlend"})),
("perspective.move", json!({"from": [0, 0], "to": [1e308, -1e308], "perpendicular": true, "copy": true, "plane": "ground"})),
("perspective.move", json!({"from": [f64::MAX, 0], "to": [0, 0], "plane": "left"})),
("perspective.transform", json!({"matrix": [1e308, 0, 0, 1e308, 0, 0], "plane": "right"})),
("perspective.transform", json!({"matrix": [1, 0, 0, 1, 0, 0], "depth": -1e9, "plane": "left", "copy": true})),
("perspective.transform", json!({"matrix": [1, 0, 0, 1, 1e300, 0], "plane": "left"})),
("perspective.nudge", json!({"dx": 1e308, "dy": -1e308, "big": true, "copy": true})),
("perspective.plane.move", json!({"plane": "ground", "offset": 1e308, "objects": "copy"})),
("perspective.plane.move", json!({"plane": "left", "by": -1e7, "objects": "move"})),
("perspective.plane.move", json!({"plane": "none", "offset": 0})),
("perspective.plane.matchObject", json!({"id": u64::MAX})),
("perspective.grid.set", json!({"leftOffset": -1e12, "reproject": true})),
("perspective.grid.set", json!({"vpRight": -1e6, "reproject": true})),
("perspective.editText", json!({"id": u64::MAX})),
(
"perspective.draw",
json!({"command": "shape.rectangle", "params": {"x": 1, "y": 1, "width": 10, "height": 10}, "at": [1e308, -1e308], "plane": "left"}),
),
("perspective.draw", json!({"command": "shape.flare", "params": {"cx": 0, "cy": 0}, "plane": "ground"})),
("object.setProps", json!({"opacity": -1, "blend": 5})),
("effect.apply", json!({"effect": "distort.roughen", "params": {"size": 100, "detail": 100, "relative": false}})),
("effect.apply", json!({"effect": "distort.zigZag", "params": {"size": 1e308, "ridges": 100}})),
("effect.apply", json!({"effect": "distort.transform", "params": {"copies": 1e308}})),
("effect.apply", json!({"effect": "stylize.dropShadow", "params": {"blur": 1e308, "opacity": -1}})),
("effect.apply", json!({"effect": "no.such.effect"})),
("effect.remove", json!({"index": 99})),
("effect.setParams", json!({"index": 0, "params": null})),
("object.path.offsetPath", json!({"offset": 1e308})),
("object.path.offsetPath", json!({"offset": -1e308})),
("object.path.simplify", json!({"tolerance": -1, "cornerAngle": 1e308})),
("object.path.splitIntoGrid", json!({"rows": 500, "columns": 1, "gutter": 1e308})),
("object.path.splitIntoGrid", json!({"rows": 0.4})),
("object.setBounds", json!({"width": 0, "height": 0})),
("object.setBounds", json!({"width": -10, "height": 1e308, "reference": 99})),
("object.distributeSpacing", json!({"axis": "horizontal", "spacing": -1e308})),
("artboard.setProps", json!({"index": 0, "width": -1, "height": 0})),
("artboard.new", json!({"width": 0, "height": -1})),
("artboard.delete", json!({"index": 0})),
("artboard.move", json!({"index": 0, "dx": 1e308, "dy": 0, "moveArt": true})),
("node.move", json!({"id": 1, "parent": 2, "index": 0})),
("node.move", json!({"id": 2, "parent": 2, "index": 0})),
("node.move", json!({"id": 1, "parent": null, "index": 1000})),
("layer.setProps", json!({"id": 1, "color": 1000})),
("layer.newSublayer", json!({"parent": 2})),
("text.create", json!({"x": 0, "y": 0, "text": "\u{0}\u{FFFF}\u{1F600}", "size": -1})),
("text.create", json!({"x": 0, "y": 0, "text": "a", "size": 1e308, "area": {"width": -1, "height": 0}})),
("text.setStyle", json!({"size": 0, "leading": -1, "tracking": 1e308})),
("document.setUnits", json!({"units": "Parsecs"})),
("document.open", json!({"name": "x.svg", "dataBase64": "!!!"})),
("document.open", json!({"name": "x.svg", "dataBase64": "PHN2Zz4="})),
("document.open", json!({"name": "x.pdf", "dataBase64": "JVBERi0xLjQK"})),
("document.open", json!({"name": "x.vectorcraft", "dataBase64": "e30="})),
("document.activate", json!({"index": 99})),
("file.close", json!({"index": 99})),
("file.new", json!({"width": -1, "height": 0, "artboards": 1000000})),
("command.batch", json!({"commands": [{"command": 5}, {"params": 3}]})),
("command.batch", json!({"commands": "nope"})),
("object.puppetWarp", json!({"pins": [[0, 0]], "moved": [[0, 0]], "angles": [1e308]})),
("object.puppetWarp", json!({"pins": [[0, 0], [5, 5]], "moved": [[0, 0], [1e9, 1e9]], "angles": [-1e308, "x"]})),
("object.liquify", json!({"tool": "pucker", "points": [[0, 0, 1e308], [1, 1, -5], [2, 2, "x"]], "usePressure": true})),
("object.liquify", json!({"tool": "twirl", "points": vec![json!([50, 50, 0.5]); 400], "usePressure": "yes", "simplifyOn": 3})),
("object.liquify", json!({"tool": "wrinkle", "points": [[0, 0], [1e4, 1e4]], "width": 1e308, "complexity": -1, "affectIn": null})),
("object.blend.make", json!({"ids": [1, 2, 3], "starts": [u64::MAX, -1, "x", null, 1e308]})),
("object.blend.make", json!({"ids": [2, 2], "starts": {"a": 1}, "steps": 1e308})),
("object.blend.options", json!({"spacing": "distance", "value": -1e308, "orientation": 5})),
("object.blend.spine.moveAnchor", json!({"id": 2, "anchor": u64::MAX, "x": 1e308, "y": -1e308, "handle": "sideways"})),
("object.blend.spine.addAnchor", json!({"id": u64::MAX, "x": 0, "y": 0})),
("object.blend.spine.removeAnchor", json!({"anchor": -1})),
("object.puppetWarp", json!({"rest": true, "pins": [], "moved": []})),
("object.puppetWarp", json!({"rest": true, "pins": [[1e308, 0]], "moved": [[0, 0]], "expand": -5})),
("object.puppetWarp", json!({"rest": true, "ids": [u64::MAX], "pins": [[0, 0]], "moved": [[0, 0]]})),
("object.puppetWarp.pins", json!({"ids": [0, 1, 2], "expand": 1e308})),
];
let mut failures = vec![];
for fx in Fixture::ALL {
for (id, p) in &cases {
if let Some(f) = probe(fx, id, p) {
failures.push(f);
}
}
}
assert!(failures.is_empty(), "{} failures:\n{}", failures.len(), failures.join("\n"));
}
/// After a successful fuzzed call, the document still round-trips and exports.
#[test]
fn fuzzed_calls_keep_documents_serializable() {
let path = safe_path();
let mut failures = vec![];
for c in command_specs() {
if heavy(c.id) || c.id.starts_with("file.") {
continue;
}
for v in junk_values().iter().take(8) {
for k in param_keys(c.params) {
let k = if k == "path" { continue } else { k };
let mut s = Fixture::Multi.session();
let p = json!({ k.clone(): v });
if known_bug(c.id, &p) {
continue;
}
let ok = catch_quiet(|| s.execute(c.id, &p)).map(|r| r.is_ok()).unwrap_or(false);
if ok && let Err(e) = catch_quiet(|| check_all(&mut s)).unwrap_or_else(|m| Err(format!("panic in checks: {m}"))) {
failures.push(format!("{} {p}: {e}", c.id));
}
}
}
}
let _ = path;
failures.sort();
failures.dedup();
assert!(failures.is_empty(), "{} failures:\n{}", failures.len(), failures.iter().take(40).cloned().collect::<Vec<_>>().join("\n"));
}
/// Undo after any successful command in the Multi fixture restores the exact document.
#[test]
fn every_command_undoes_exactly() {
let mut failures = vec![];
for c in command_specs() {
if matches!(c.id, "edit.undo" | "edit.redo") || c.id.starts_with("file.") || c.id.starts_with("document.") {
continue;
}
let mut s = Fixture::Multi.session();
let before = doc_json(&s.doc().unwrap().doc);
let depth = s.doc().unwrap().history.undo.len();
let Ok(Ok(_)) = catch_quiet(|| s.execute(c.id, &json!({}))) else { continue };
if s.doc().unwrap().history.undo.len() > depth {
let _ = s.execute("edit.undo", &json!({}));
let after = doc_json(&s.doc().unwrap().doc);
if after != before {
failures.push(format!("{}: {}", c.id, vectorcraft_testkit::invariants::first_diff(&before, &after, "$")));
}
} else if doc_json(&s.doc().unwrap().doc) != before && !c.params.contains("View state: not an undo step") {
failures.push(format!("{}: changed the document without an undo step", c.id));
}
}
assert!(failures.is_empty(), "{}", failures.join("\n"));
}
/// Data Recovery reads whatever its store holds: damaged copies and details fail cleanly, and junk
/// params never panic.
#[test]
fn recovery_commands_with_a_damaged_store_and_junk_params() {
use std::sync::Arc;
use vectorcraft_engine::cmd::recovery::{MemoryStore, RecoveryStore};
let store = Arc::new(MemoryStore::default());
for (name, bytes) in [
("1-1/bad-1.vectorcraft", &b"{not json"[..]),
("1-1/bad-1.json", b"[1, 2"),
("1-1/gz-1.vectorcraft", &[0x1f, 0x8b, 0, 1, 2][..]),
("1-1/meta-only.json", br#"{"title": 5, "path": [], "saved": "x"}"#),
("2-1/heartbeat", b"not a number"),
("2-1/x.vectorcraft", b"{}"),
("../escape.vectorcraft", b"{}"),
("no-area.vectorcraft", b"{}"),
("/.vectorcraft", b"{}"),
] {
store.write(name, bytes).unwrap();
}
let path = safe_path();
for fx in Fixture::ALL {
for id in ["file.recovery.save", "file.recovery.list", "file.recovery.restore", "file.recovery.discard"] {
let spec = command_specs().iter().find(|c| c.id == id).unwrap();
for p in std::iter::once(json!({})).chain(junk_params(spec.params, &path)) {
let mut s = fx.session();
s.recovery.set_store(store.clone());
let r = catch_quiet(|| s.execute(id, &p));
assert!(r.is_ok(), "PANIC {id} {p} [{fx:?}]");
check_session(&s).unwrap_or_else(|e| panic!("{id} {p} [{fx:?}]: {e}"));
}
}
}
}
/// Envelope Distort's commands on warp, mesh and top-object envelopes (selected, and with their
/// content selected in Edit Contents) with `{}` and junk params: never a panic, an open
/// interaction or a broken tree.
#[test]
fn envelope_commands_with_junk_params_on_envelopes() {
let path = safe_path();
let makes: [(&str, Value); 3] = [
("object.envelope.makeWithWarp", json!({"style": "twist", "bend": 80})),
("object.envelope.makeWithMesh", json!({"rows": 2, "cols": 3})),
("object.envelope.makeWithTopObject", json!({})),
];
let mut failures = vec![];
for (make, mp) in &makes {
for editing in [false, true] {
let ids: Vec<&str> =
command_specs().iter().map(|c| c.id).filter(|id| id.starts_with("object.envelope.") || id.starts_with("object.mesh.")).collect();
for id in ids {
let spec = command_specs().iter().find(|c| c.id == id).unwrap();
for p in std::iter::once(json!({})).chain(junk_params(spec.params, &path)) {
let mut s = Fixture::Multi.session();
if s.execute(make, mp).is_err() {
failures.push(format!("{make} failed on the Multi fixture"));
continue;
}
if editing {
let _ = s.execute("object.envelope.editContents", &json!({"editing": true}));
}
let r = catch_quiet(|| s.execute(id, &p));
if r.is_err() {
failures.push(format!("PANIC {id} {p} [{make}, editing {editing}]"));
} else if s.in_interaction() {
failures.push(format!("{id} {p} [{make}]: left an interaction open"));
} else if let Err(e) = check_session(&s) {
failures.push(format!("{id} {p} [{make}]: {e}"));
}
}
}
}
}
failures.sort();
failures.dedup();
assert!(failures.is_empty(), "{} failures:\n{}", failures.len(), failures.iter().take(40).cloned().collect::<Vec<_>>().join("\n"));
}