Conformance

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The engine is tested against test262, the conformance suite of ECMAScript. A run is a test in one mode (sloppy, strict or module). The excluded tests use features that the engine does not implement on purpose, and are not run. The pass rate is computed over the runs of the other tests: the skipped runs and the known failures do not pass. Each known failure is listed with its reason in the expectation files of tests/Meziantou.Framework.JavaScriptEngine.Test262/expectations; some come from the version of the Unicode data that the tests expect, see Data versions and output differences.

Overall: 99.8% (102,576 / 102,762 runs)

Area	Files	Runs	Skipped	Failing	Passing	Pass rate
annexB/built-ins	241	482	0	0	482	100.0%
annexB/language	845	895	0	0	895	100.0%
built-ins/AbstractModuleSource	8	8	0	0	8	100.0%
built-ins/AggregateError	25	50	0	0	50	100.0%
built-ins/Array	3083	6119	0	0	6119	100.0%
built-ins/ArrayBuffer	221	442	0	0	442	100.0%
built-ins/ArrayIteratorPrototype	27	46	0	0	46	100.0%
built-ins/AsyncDisposableStack	104	208	0	0	208	100.0%
built-ins/AsyncFromSyncIteratorPrototype	38	76	0	0	76	100.0%
built-ins/AsyncFunction	18	36	0	0	36	100.0%
built-ins/AsyncGeneratorFunction	23	46	0	0	46	100.0%
built-ins/AsyncGeneratorPrototype	48	96	0	0	96	100.0%
built-ins/AsyncIteratorPrototype	13	26	0	0	26	100.0%
built-ins/Atomics	389	778	0	0	778	100.0%
built-ins/BigInt	77	154	0	0	154	100.0%
built-ins/Boolean	51	101	0	0	101	100.0%
built-ins/DataView	561	1122	0	0	1122	100.0%
built-ins/Date	594	1188	0	0	1188	100.0%
built-ins/DisposableStack	93	186	0	0	186	100.0%
built-ins/Error	93	186	0	0	186	100.0%
built-ins/FinalizationRegistry	47	94	0	0	94	100.0%
built-ins/Function	509	893	0	0	893	100.0%
built-ins/GeneratorFunction	23	46	0	0	46	100.0%
built-ins/GeneratorPrototype	61	122	0	0	122	100.0%
built-ins/Infinity	6	10	0	0	10	100.0%
built-ins/Iterator	654	1308	0	0	1308	100.0%
built-ins/JSON	166	332	0	0	332	100.0%
built-ins/Map	204	405	0	0	405	100.0%
built-ins/MapIteratorPrototype	11	22	0	0	22	100.0%
built-ins/Math	327	654	0	0	654	100.0%
built-ins/NaN	6	10	0	0	10	100.0%
built-ins/NativeErrors	94	188	0	0	188	100.0%
built-ins/Number	340	680	0	0	680	100.0%
built-ins/Object	3411	6802	0	0	6802	100.0%
built-ins/Promise	732	1458	0	0	1458	100.0%
built-ins/Proxy	311	607	0	0	607	100.0%
built-ins/Reflect	153	306	0	0	306	100.0%
built-ins/RegExp	1879	3756	0	180	3576	95.2%
built-ins/RegExpStringIteratorPrototype	17	34	0	0	34	100.0%
built-ins/Set	383	764	0	0	764	100.0%
built-ins/SetIteratorPrototype	11	22	0	0	22	100.0%
built-ins/ShadowRealm	64	124	0	0	124	100.0%
built-ins/SharedArrayBuffer	104	208	0	0	208	100.0%
built-ins/String	1223	2443	0	0	2443	100.0%
built-ins/StringIteratorPrototype	7	14	0	0	14	100.0%
built-ins/SuppressedError	22	44	0	0	44	100.0%
built-ins/Symbol	98	192	0	0	192	100.0%
built-ins/Temporal	4605	9210	0	0	9210	100.0%
built-ins/ThrowTypeError	14	28	0	0	28	100.0%
built-ins/TypedArray	1453	2890	0	0	2890	100.0%
built-ins/TypedArrayConstructors	738	1446	0	0	1446	100.0%
built-ins/Uint8Array	70	140	0	0	140	100.0%
built-ins/WeakMap	141	281	0	0	281	100.0%
built-ins/WeakRef	29	58	0	0	58	100.0%
built-ins/WeakSet	85	170	0	0	170	100.0%
built-ins/decodeURI	55	110	0	0	110	100.0%
built-ins/decodeURIComponent	56	112	0	0	112	100.0%
built-ins/encodeURI	31	62	0	0	62	100.0%
built-ins/encodeURIComponent	31	62	0	0	62	100.0%
built-ins/eval	10	20	0	0	20	100.0%
built-ins/global	29	56	0	0	56	100.0%
built-ins/isFinite	15	30	0	0	30	100.0%
built-ins/isNaN	15	30	0	0	30	100.0%
built-ins/parseFloat	54	108	0	0	108	100.0%
built-ins/parseInt	55	110	0	0	110	100.0%
built-ins/undefined	8	12	0	0	12	100.0%
intl402	22	44	0	0	44	100.0%
intl402/Array	2	4	0	0	4	100.0%
intl402/BigInt	11	22	0	0	22	100.0%
intl402/Collator	65	130	0	0	130	100.0%
intl402/Date	12	24	0	0	24	100.0%
intl402/DateTimeFormat	245	490	0	0	490	100.0%
intl402/DisplayNames	57	114	0	0	114	100.0%
intl402/DurationFormat	110	220	0	0	220	100.0%
intl402/FallbackSymbol	2	4	0	0	4	100.0%
intl402/Intl	66	132	0	0	132	100.0%
intl402/ListFormat	81	162	0	0	162	100.0%
intl402/Locale	190	380	0	0	380	100.0%
intl402/Number	7	14	0	0	14	100.0%
intl402/NumberFormat	251	502	0	0	502	100.0%
intl402/PluralRules	53	106	0	0	106	100.0%
intl402/RelativeTimeFormat	80	160	0	0	160	100.0%
intl402/Segmenter	79	158	0	0	158	100.0%
intl402/String	19	38	0	0	38	100.0%
intl402/Temporal	2029	4058	0	0	4058	100.0%
intl402/TypedArray	1	2	0	0	2	100.0%
language/arguments-object	263	460	0	0	460	100.0%
language/asi	102	204	0	0	204	100.0%
language/block-scope	145	287	0	0	287	100.0%
language/comments	52	81	0	0	81	100.0%
language/computed-property-names	48	96	0	0	96	100.0%
language/destructuring	19	37	0	0	37	100.0%
language/directive-prologue	62	62	0	0	62	100.0%
language/eval-code	347	454	0	0	454	100.0%
language/export	3	3	0	0	3	100.0%
language/expressions	11102	21286	0	0	21286	100.0%
language/function-code	217	281	0	0	281	100.0%
language/future-reserved-words	55	85	0	0	85	100.0%
language/global-code	42	75	0	0	75	100.0%
language/identifier-resolution	14	22	0	0	22	100.0%
language/identifiers	268	535	0	0	535	100.0%
language/import	129	135	0	0	135	100.0%
language/keywords	25	50	0	0	50	100.0%
language/line-terminators	41	82	0	0	82	100.0%
language/literals	536	1041	0	0	1041	100.0%
language/module-code	599	602	0	0	602	100.0%
language/punctuators	11	22	0	0	22	100.0%
language/reserved-words	27	53	0	0	53	100.0%
language/rest-parameters	11	22	0	0	22	100.0%
language/source-text	1	2	0	0	2	100.0%
language/statementList	80	160	0	0	160	100.0%
language/statements	9347	18015	0	0	18015	100.0%
language/types	113	211	0	0	211	100.0%
language/white-space	67	134	0	0	134	100.0%
staging	4	8	0	0	8	100.0%
staging/Temporal	2	4	0	0	4	100.0%
staging/Uint8Array	1	2	0	0	2	100.0%
staging/built-ins	8	16	0	0	16	100.0%
staging/decorators	3	6	0	0	6	100.0%
staging/explicit-resource-management	53	105	0	0	105	100.0%
staging/set-methods	3	6	0	0	6	100.0%
staging/sm	1406	2631	2	4	2625	99.8%
staging/source-phase-imports	2	4	0	0	4	100.0%
staging/top-level-await	1	1	0	0	1	100.0%
Total	53500	102762	2	184	102576	99.8%