fix(testing): render Error-like rejection reasons as Name: message - #1191
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📝 WalkthroughWalkthroughThe testing library now formats rejected Promise reasons with meaningful error names and messages. Tests cover interpreted and bytecode modes, built-in and custom errors, explicit names, plain objects, and message-only objects. The testing API documents the new rejection output. ChangesPromise rejection reporting
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to The PR changes how rejected Error-like values are rendered. A bounded edge case may still display a subclass name instead of an explicitly assigned prototype name of "Error", affecting failure-message accuracy; merge is reasonable with owner awareness or follow-up on this formatting case. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
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Suite TimingTest Runner (interpreted: 12,340 passed; bytecode: 12,340 passed)
MemoryGC rows aggregate the main thread plus all worker thread-local GCs. Test runner worker shutdown frees thread-local heaps in bulk; that shutdown reclamation is not counted as GC collections or collected objects.
Benchmarks (interpreted: 440; bytecode: 440)
MemoryGC rows aggregate the main thread plus all worker thread-local GCs. Benchmark runner performs explicit between-file collections, so collection and collected-object counts can be much higher than the test runner.
Boot
Empty-script ( Measured on ubuntu-latest x64. |
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Benchmark Results440 benchmarks · PR vs same-runner Interpreted: 🟢 72 improved · 🔴 15 regressed · 353 unchanged · avg +2.7% Typical per-run noise (median variance): interpreted ±2.1%, bytecode ±1.6%. Deltas within noise overlap and read as unchanged. arraybuffer.js — Interp: 🟢 2, 12 unch. · avg +1.2% · Bytecode: 🟢 1, 🔴 1, 12 unch. · avg +1.1%
arrays.js — Interp: 🟢 1, 18 unch. · avg +0.2% · Bytecode: 🟢 1, 🔴 3, 15 unch. · avg +0.7%
async-await.js — Interp: 🟢 1, 🔴 1, 4 unch. · avg +2.1% · Bytecode: 6 unch. · avg +3.3%
async-generators.js — Interp: 🟢 1, 1 unch. · avg +5.0% · Bytecode: 2 unch. · avg -4.6%
atomics.js — Interp: 🔴 1, 5 unch. · avg +0.1% · Bytecode: 6 unch. · avg +0.9%
base64.js — Interp: 🟢 2, 8 unch. · avg +1.5% · Bytecode: 🟢 3, 🔴 1, 6 unch. · avg -0.7%
classes.js — Interp: 🟢 6, 25 unch. · avg +2.3% · Bytecode: 🟢 9, 22 unch. · avg +2.4%
closures.js — Interp: 11 unch. · avg +1.0% · Bytecode: 🔴 2, 9 unch. · avg -1.1%
collections.js — Interp: 🟢 2, 10 unch. · avg +2.2% · Bytecode: 🔴 1, 11 unch. · avg +0.2%
csv.js — Interp: 13 unch. · avg -1.9% · Bytecode: 🟢 1, 🔴 1, 11 unch. · avg +0.4%
destructuring.js — Interp: 🟢 7, 15 unch. · avg +2.0% · Bytecode: 🟢 2, 🔴 2, 18 unch. · avg +0.1%
fibonacci.js — Interp: 🔴 1, 7 unch. · avg +0.9% · Bytecode: 8 unch. · avg -1.2%
float16array.js — Interp: 🟢 3, 29 unch. · avg +1.3% · Bytecode: 🟢 3, 🔴 5, 24 unch. · avg +0.4%
for-in/for-in.js — Interp: 3 unch. · avg +5.3% · Bytecode: 3 unch. · avg +0.9%
for-of.js — Interp: 🟢 4, 3 unch. · avg +6.8% · Bytecode: 🟢 1, 🔴 1, 5 unch. · avg +4.8%
generators.js — Interp: 4 unch. · avg +1.8% · Bytecode: 🔴 3, 1 unch. · avg -3.3%
intl.js — Interp: 🟢 2, 4 unch. · avg +0.3% · Bytecode: 🔴 1, 5 unch. · avg -2.0%
iterators.js — Interp: 🟢 5, 37 unch. · avg +2.9% · Bytecode: 🟢 19, 23 unch. · avg +4.8%
json.js — Interp: 🟢 3, 🔴 1, 19 unch. · avg +1.9% · Bytecode: 🟢 2, 🔴 1, 20 unch. · avg +0.5%
jsx.jsx — Interp: 21 unch. · avg +1.1% · Bytecode: 🟢 2, 🔴 9, 10 unch. · avg -3.7%
modules.js — Interp: 🟢 2, 7 unch. · avg +3.1% · Bytecode: 9 unch. · avg -0.1%
numbers.js — Interp: 🟢 3, 9 unch. · avg +3.2% · Bytecode: 🟢 2, 🔴 1, 9 unch. · avg -0.7%
objects.js — Interp: 8 unch. · avg +0.9% · Bytecode: 🟢 1, 7 unch. · avg +5.6%
promises.js — Interp: 🟢 2, 10 unch. · avg +5.6% · Bytecode: 🔴 7, 5 unch. · avg -7.4%
property-access.js — Interp: 🟢 2, 3 unch. · avg +4.2% · Bytecode: 🟢 3, 2 unch. · avg +1.9%
regexp.js — Interp: 13 unch. · avg +3.7% · Bytecode: 🟢 2, 🔴 1, 10 unch. · avg +0.8%
strings.js — Interp: 🟢 1, 🔴 3, 15 unch. · avg +0.2% · Bytecode: 🟢 2, 🔴 3, 14 unch. · avg +0.4%
temporal.js — Interp: 🟢 1, 5 unch. · avg -2.3% · Bytecode: 🔴 3, 3 unch. · avg -2.3%
tsv.js — Interp: 🟢 3, 6 unch. · avg +6.2% · Bytecode: 🟢 2, 🔴 4, 3 unch. · avg -0.4%
typed-arrays.js — Interp: 🟢 8, 🔴 1, 13 unch. · avg +14.7% · Bytecode: 🟢 3, 🔴 9, 10 unch. · avg +3.6%
uint8array-encoding.js — Interp: 🟢 1, 🔴 5, 12 unch. · avg -4.5% · Bytecode: 🟢 5, 🔴 2, 11 unch. · avg +4.3%
weak-collections.js — Interp: 🟢 10, 🔴 2, 3 unch. · avg +12.9% · Bytecode: 🔴 11, 4 unch. · avg -21.5%
Deterministic profile diffDeterministic profile diff: no significant changes. Measured on ubuntu-latest x64. Each PR run also builds the |
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Web Tooling Benchmark
18 pinned Web Tooling workloads; 18 workloads produced at least one Goccia sample. Raw results from 1 sample per workload; full stdout/stderr for failures and min/max/CV stay in the |
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AWFY Results
Geomean Ratios
14 pinned AWFY benchmarks. Medians from 5 interleaved samples per engine; raw JSON includes min/max/CV and is attached as the |
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JetStream 3 Performance Barometer
Geomean reference ratio: QuickJS 26.04×; Node.js 308.88×. 1.00× means aligned; values above 1.00× mean Goccia was proportionally slower after normalizing JetStream’s higher-is-better score. This is a directional barometer across runtimes with different goals, not a product ranking. Raw samples and failure details remain in the |
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test262 Conformance
Areas closest to 100%
Per-test deltas (+0 / -0 / timeout +0 / -2)Resolved timeouts (2):
Steady-state failures and timeouts are non-blocking; PASS → non-timeout failure transitions fail the conformance gate. Measured on ubuntu-latest x64, bytecode mode. Areas grouped by the first two test262 path components; minimum 25 attempted tests, areas already at 100% excluded. Δ vs main compares against the most recent cached |
A returned-promise rejection whose reason is a plain Error rendered as
{} because name lives on the prototype and message is non-enumerable.
Rejection reasons now go through a rejection-only describer that reads
the prototype-chain name (with declared-class constructor narrowing so
subclasses report their own name); matcher output is untouched.
…ring Constructor-name narrowing now applies only while the resolved name is still the default "Error", so ProtoNamed.prototype.name = 'X' renders X rather than the constructor name, matching what e.name reports.
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Inline comments:
In `@source/units/Goccia.Builtins.TestingLibrary.pas`:
- Around line 788-805: The error-name handling currently falls back to the
constructor even when the resolved name comes from a prototype assignment.
Update the relevant error-formatting logic to distinguish names inherited from
Error.prototype from explicitly assigned prototype names, preserving an
explicitly assigned "Error" name and using the constructor fallback only for the
Error.prototype value; add this scenario to the runner-output test matrix.
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📒 Files selected for processing (3)
docs/testing-api.mdscripts/test-cli.tssource/units/Goccia.Builtins.TestingLibrary.pas
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Summary
Errornow rendersReturned Promise rejected: Error: boominstead of{}.Errorkeepsnameon its prototype andmessagenon-enumerable, so the generic serializer had nothing to print — the one shape a debugging session most needs named.name/messagereader (DescribeThrowValue), with one narrowing: while the resolved name is still the default"Error", a declared subclass reports its class name (MyErr: boom), because that identity otherwise lives only on the constructor. Any author-assigned name — own or prototype (ProtoNamed.prototype.name = 'X') — wins, matching whate.namereports. Built-in errors, plain objects, and non-object reasons render exactly as before.DescribeThrowValueitself is byte-identical, and the.resolvesfailure path keeps its current rendering becausescripts/test-cli.tspins vitest-facing matcher text.Testing
test-cli.tsrunner-output block (plain Error, bare subclass, own-name subclass, prototype-named subclass, native TypeError, plain object, message-only object)docs/testing-api.mdnote beside the microtask-drain rendering notes)./format.pas --checkcleanReview: fresh-context pass found zero Blocking/Important findings; its one notable Minor (prototype-assigned names being overridden) is fixed here with a regression case.
Why the tests live in
scripts/test-cli.ts, nottests/What this PR changes is the runner's own failure-report text, and that output is not observable from inside a run:
AssertionFailedrecords the failure and writes the line to stdout rather than throwing (a pre-existing comment inscripts/test-cli.tsnotes exactly this), so no JS test can catch or assert on the rendered string — and atests/file exercising the rendering would have to be a deliberately failing test, failing the suite it lives in.tests/**also doubles as the Vitest parity corpus (vitest.config.js), so a deliberately failing file would break both runners while Vitest rendered the rejection in its own format anyway. Perdocs/testing.md, runner-output contracts belong to the CLI harness; the new cases extend the pre-existing "Assertion failure text (TestRunner)" block, spawning the built binary and asserting the renderings on captured stdout in both modes — the real end-to-end print path.