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test/built-ins/String/prototype/split/call-split-l-0-instance-is-string-hello.js * - test/built-ins/String/prototype/split/call-split-l-1-instance-is-string-hello.js * - test/built-ins/String/prototype/split/call-split-l-2-instance-is-string-hello.js * - test/built-ins/String/prototype/split/call-split-l-3-instance-is-string-hello.js * - test/built-ins/String/prototype/split/call-split-l-4-instance-is-string-hello.js * - test/built-ins/String/prototype/split/call-split-l-na-n-instance-is-string-hello.js * - test/built-ins/String/prototype/split/call-split-l-instance-is-string-hello.js * - test/built-ins/String/prototype/split/call-split-ll-instance-is-string-hello.js * - test/built-ins/String/prototype/split/call-split-h-instance-is-string-hello.js * - test/built-ins/String/prototype/split/call-split-hello-instance-is-string-hello.js * - test/built-ins/String/prototype/split/call-split-hellothere-instance-is-string-hello.js * - test/built-ins/String/prototype/split/call-split-o-instance-is-string-hello.js * - test/built-ins/String/prototype/split/call-split-x-instance-is-string-hello.js * - test/built-ins/String/prototype/split/call-split-x-instance-is-empty-string.js * - test/built-ins/String/prototype/split/call-split-4-instance-is-string-one-1-two-2-four-4.js * - test/built-ins/String/prototype/split/call-split-on-instance-is-string-one-1-two-2-four-4.js * - test/built-ins/String/prototype/split/call-split-instance-is-string-one-two-three-four-five.js * - test/built-ins/String/prototype/split/call-split-instance-is-string-one-two-three.js * - test/built-ins/String/prototype/split/call-split-instance-is-string.js * - test/built-ins/String/prototype/split/instance-is-string-one-two-three-four-five.js * - test/built-ins/String/prototype/split/instance-is-string.js * - test/built-ins/String/prototype/split/separator-colon-instance-is-string-one-1-two-2-four-4.js * - test/built-ins/String/prototype/split/separator-comma-instance-is-string-one-two-three-four-five.js * - test/built-ins/String/prototype/split/separator-empty-string-instance-is-string.js * - test/built-ins/String/prototype/split/call-split-without-arguments-and-instance-is-empty-string.js * - test/built-ins/String/prototype/split/separator-undef.js * - test/built-ins/String/prototype/slice/S15.5.4.13_A1_T6.js * - test/built-ins/String/prototype/slice/S15.5.4.13_A1_T14.js * - test/built-ins/String/prototype/slice/S15.5.4.13_A2_T1.js * - test/built-ins/String/prototype/slice/S15.5.4.13_A2_T2.js * - test/built-ins/String/prototype/slice/S15.5.4.13_A2_T3.js * - test/built-ins/String/prototype/slice/S15.5.4.13_A2_T4.js * - test/built-ins/String/prototype/slice/S15.5.4.13_A2_T5.js * - test/built-ins/String/prototype/slice/S15.5.4.13_A2_T6.js * - test/built-ins/String/prototype/slice/S15.5.4.13_A2_T7.js * - test/built-ins/String/prototype/slice/S15.5.4.13_A2_T8.js * - test/built-ins/String/prototype/slice/S15.5.4.13_A2_T9.js * - test/built-ins/String/prototype/substring/S15.5.4.15_A1_T6.js * - test/built-ins/String/prototype/substring/S15.5.4.15_A1_T14.js * - test/built-ins/String/prototype/substring/S15.5.4.15_A2_T1.js * - test/built-ins/String/prototype/substring/S15.5.4.15_A2_T2.js * - test/built-ins/String/prototype/substring/S15.5.4.15_A2_T3.js * - test/built-ins/String/prototype/substring/S15.5.4.15_A2_T4.js * - test/built-ins/String/prototype/substring/S15.5.4.15_A2_T5.js * - test/built-ins/String/prototype/substring/S15.5.4.15_A2_T6.js * - test/built-ins/String/prototype/substring/S15.5.4.15_A2_T7.js * - test/built-ins/String/prototype/substring/S15.5.4.15_A2_T8.js * - test/built-ins/String/prototype/substring/S15.5.4.15_A2_T9.js * - test/built-ins/String/prototype/substring/S15.5.4.15_A2_T10.js * - test/built-ins/String/prototype/includes/String.prototype.includes_FailMissingLetter.js * - test/built-ins/String/prototype/includes/String.prototype.includes_SuccessNoLocation.js * - test/built-ins/String/prototype/includes/String.prototype.includes_FailBadLocation.js * - test/built-ins/String/prototype/includes/String.prototype.includes_FailLocation.js * - test/built-ins/String/prototype/includes/String.prototype.includes_Success.js * - test/built-ins/String/prototype/includes/searchstring-found-with-position.js * - test/built-ins/String/prototype/includes/searchstring-found-without-position.js * - test/built-ins/String/prototype/includes/searchstring-not-found-with-position.js * - test/built-ins/String/prototype/includes/searchstring-not-found-without-position.js * - test/built-ins/String/prototype/includes/return-false-with-out-of-bounds-position.js * - test/built-ins/String/prototype/includes/return-true-if-searchstring-is-empty.js * - test/built-ins/String/prototype/includes/coerced-values-of-position.js * - test/built-ins/String/prototype/startsWith/searchstring-found-with-position.js * - test/built-ins/String/prototype/startsWith/searchstring-found-without-position.js * - test/built-ins/String/prototype/startsWith/searchstring-not-found-with-position.js * - test/built-ins/String/prototype/startsWith/searchstring-not-found-without-position.js * - test/built-ins/String/prototype/startsWith/out-of-bounds-position.js * - test/built-ins/String/prototype/startsWith/return-true-if-searchstring-is-empty.js * - test/built-ins/String/prototype/startsWith/coerced-values-of-position.js * - test/built-ins/String/prototype/endsWith/String.prototype.endsWith_Success.js * - test/built-ins/String/prototype/endsWith/String.prototype.endsWith_Success_2.js * - test/built-ins/String/prototype/endsWith/String.prototype.endsWith_Success_3.js * - test/built-ins/String/prototype/endsWith/String.prototype.endsWith_Success_4.js * - test/built-ins/String/prototype/endsWith/String.prototype.endsWith_Fail.js * - test/built-ins/String/prototype/endsWith/String.prototype.endsWith_Fail_2.js * - test/built-ins/String/prototype/endsWith/searchstring-found-with-position.js * - test/built-ins/String/prototype/endsWith/searchstring-found-without-position.js * - test/built-ins/String/prototype/endsWith/searchstring-not-found-with-position.js * - test/built-ins/String/prototype/endsWith/searchstring-not-found-without-position.js * - test/built-ins/String/prototype/endsWith/return-false-if-search-start-is-less-than-zero.js * - test/built-ins/String/prototype/endsWith/return-true-if-searchstring-is-empty.js * - test/built-ins/String/prototype/endsWith/coerced-values-of-position.js * - test/built-ins/String/prototype/indexOf/S15.5.4.7_A2_T1.js * - test/built-ins/String/prototype/indexOf/S15.5.4.7_A2_T2.js * - test/built-ins/String/prototype/indexOf/S15.5.4.7_A2_T3.js * - test/built-ins/String/prototype/indexOf/S15.5.4.7_A2_T4.js * - test/built-ins/String/prototype/indexOf/S15.5.4.7_A3_T1.js * - test/built-ins/String/prototype/indexOf/S15.5.4.7_A3_T3.js * - test/built-ins/String/prototype/indexOf/position-tointeger.js * - test/built-ins/String/prototype/indexOf/searchstring-tostring.js * - test/built-ins/String/prototype/lastIndexOf/not-a-substring.js * * Copyright 2009 the Sputnik authors. All rights reserved. * Copyright (c) 2014 Ryan Lewis. All rights reserved. * Copyright (C) 2015 the V8 project authors. All rights reserved. * Copyright (C) 2016 the V8 project authors. All rights reserved. * Copyright (C) 2017 Josh Wolfe. All rights reserved. * Copyright (C) 2020 Leo Balter. All rights reserved. * Copyright (C) 2026 Garham Lee. All rights reserved. * Test262 portions are governed by the BSD license in LICENSE.test262. */import { describe, expect, test } from "bun:test"import { Effect } from "effect"import { CodeMode } from "../src/index.js"
const value = async (code: string) => { const result = await Effect.runPromise(CodeMode.execute({ code, tools: {} })) if (!result.ok) throw new Error(`expected success, got ${result.error.kind}: ${result.error.message}`) return result.value}
const cases = [ { path: "test/built-ins/String/prototype/split/call-split-l-0-instance-is-string-hello.js", code: `const result = "hello".split("l", 0); return [result.length, result[0] === undefined]`, expected: [0, true], labels: [ "The value of __split.length is expected to equal the value of __expected.length", "The value of __split[0] is expected to equal the value of __expected[0]", ], }, { path: "test/built-ins/String/prototype/split/call-split-l-1-instance-is-string-hello.js", code: `const result = "hello".split("l", 1); return [result.length, result[0]]`, expected: [1, "he"], labels: [ "The value of __split.length is expected to equal the value of __expected.length", "The value of __split[0] is expected to equal the value of __expected[0]", ], }, { path: "test/built-ins/String/prototype/split/call-split-l-2-instance-is-string-hello.js", code: `const result = "hello".split("l", 2); return [result.length, result[0], result[1]]`, expected: [2, "he", ""], labels: [ "The value of __split.length is expected to equal the value of __expected.length", "The value of __split[index] is expected to equal the value of __expected[index]", "The value of __split[index] is expected to equal the value of __expected[index]", ], }, { path: "test/built-ins/String/prototype/split/call-split-l-3-instance-is-string-hello.js", code: `const result = "hello".split("l", 3); return [result.length, result[0], result[1], result[2]]`, expected: [3, "he", "", "o"], labels: [ "The value of __split.length is expected to equal the value of __expected.length", "The value of __split[index] is expected to equal the value of __expected[index]", "The value of __split[index] is expected to equal the value of __expected[index]", "The value of __split[index] is expected to equal the value of __expected[index]", ], }, { path: "test/built-ins/String/prototype/split/call-split-l-4-instance-is-string-hello.js", code: `const result = "hello".split("l", 4); return [result.length, result[0], result[1], result[2]]`, expected: [3, "he", "", "o"], labels: [ "The value of __split.length is expected to equal the value of __expected.length", "The value of __split[index] is expected to equal the value of __expected[index]", "The value of __split[index] is expected to equal the value of __expected[index]", "The value of __split[index] is expected to equal the value of __expected[index]", ], }, { path: "test/built-ins/String/prototype/split/call-split-l-na-n-instance-is-string-hello.js", code: `const result = "hello".split("l", NaN); return [result.length, result[0] === undefined]`, expected: [0, true], labels: [ "The value of __split.length is expected to equal the value of __expected.length", "The value of __split[0] is expected to equal the value of __expected[0]", ], }, { path: "test/built-ins/String/prototype/split/call-split-l-instance-is-string-hello.js", code: `const result = "hello".split("l"); return [result.length, result[0], result[1], result[2]]`, expected: [3, "he", "", "o"], labels: [ "The value of __split.length is 3", 'The value of __split[0] is "he"', 'The value of __split[1] is ""', 'The value of __split[2] is "o"', ], }, { path: "test/built-ins/String/prototype/split/call-split-ll-instance-is-string-hello.js", code: `const result = "hello".split("ll"); return [result.length, result[0], result[1]]`, expected: [2, "he", "o"], labels: ["The value of __split.length is 2", 'The value of __split[0] is "he"', 'The value of __split[1] is "o"'], }, { path: "test/built-ins/String/prototype/split/call-split-h-instance-is-string-hello.js", code: `const result = "hello".split("h"); return [result.length, result[0], result[1]]`, expected: [2, "", "ello"], labels: ["The value of __split.length is 2", 'The value of __split[0] is ""', 'The value of __split[1] is "ello"'], }, { path: "test/built-ins/String/prototype/split/call-split-hello-instance-is-string-hello.js", code: `const result = "hello".split("hello"); return [result.length, result[0], result[1]]`, expected: [2, "", ""], labels: ["The value of __split.length is 2", 'The value of __split[0] is ""', 'The value of __split[1] is ""'], }, { path: "test/built-ins/String/prototype/split/call-split-hellothere-instance-is-string-hello.js", code: `const result = "hello".split("hellothere"); return [result.length, result[0]]`, expected: [1, "hello"], labels: ["The value of __split.length is 1", 'The value of __split[0] is "hello"'], }, { path: "test/built-ins/String/prototype/split/call-split-o-instance-is-string-hello.js", code: `const result = "hello".split("o"); return [result.length, result[0], result[1]]`, expected: [2, "hell", ""], labels: ["The value of __split.length is 2", 'The value of __split[0] is "hell"', 'The value of __split[1] is ""'], }, { path: "test/built-ins/String/prototype/split/call-split-x-instance-is-string-hello.js", code: `const result = "hello".split("x"); return [result.length, result[0]]`, expected: [1, "hello"], labels: ["The value of __split.length is 1", 'The value of __split[0] is "hello"'], }, { path: "test/built-ins/String/prototype/split/call-split-x-instance-is-empty-string.js", code: `const result = "".split("x"); return [result.length, result[0]]`, expected: [1, ""], labels: ["The value of __split.length is 1", 'The value of __split[0] is ""'], }, { path: "test/built-ins/String/prototype/split/call-split-4-instance-is-string-one-1-two-2-four-4.js", code: `const result = "one-1 two-2 four-4".split("-4"); return [result.length, result[0], result[1]]`, expected: [2, "one-1 two-2 four", ""], labels: [ "The value of __split.length is 2", 'The value of __split[0] is "one-1 two-2 four"', 'The value of __split[1] is ""', ], }, { path: "test/built-ins/String/prototype/split/call-split-on-instance-is-string-one-1-two-2-four-4.js", code: `const result = "one-1 two-2 four-4".split("on"); return [result.length, result[0], result[1]]`, expected: [2, "", "e-1 two-2 four-4"], labels: [ "The value of __split.length is 2", 'The value of __split[0] is ""', 'The value of __split[1] is "e-1 two-2 four-4"', ], }, { path: "test/built-ins/String/prototype/split/call-split-instance-is-string-one-two-three-four-five.js", code: `const result = "one two three four five".split(" "); return [result.length, ...result]`, expected: [5, "one", "two", "three", "four", "five"], labels: [ "The value of __split.length is 5", 'The value of __split[0] is "one"', 'The value of __split[1] is "two"', 'The value of __split[2] is "three"', 'The value of __split[3] is "four"', 'The value of __split[4] is "five"', ], }, { path: "test/built-ins/String/prototype/split/call-split-instance-is-string-one-two-three.js", code: `const result = "one two three".split(""); return [result[0], result[1], result[11], result[12]]`, expected: ["o", "n", "e", "e"], labels: [ 'The value of __split[0] is "o"', 'The value of __split[1] is "n"', 'The value of __split[11] is "e"', 'The value of __split[12] is "e"', ], }, { path: "test/built-ins/String/prototype/split/call-split-instance-is-string.js", code: `const result = " ".split(" "); return [result.length, result[0], result[1]]`, expected: [2, "", ""], labels: ["The value of __split.length is 2", 'The value of __split[0] is ""', 'The value of __split[1] is ""'], }, { path: "test/built-ins/String/prototype/split/instance-is-string-one-two-three-four-five.js", code: `const result = "one,two,three,four,five".split(); return [result.length, result[0]]`, expected: [1, "one,two,three,four,five"], labels: ["The value of __split.length is 1", 'The value of __split[0] is "one,two,three,four,five"'], }, { path: "test/built-ins/String/prototype/split/instance-is-string.js", code: `const result = " ".split(); return [result.length, result[0]]`, expected: [1, " "], labels: ["The value of __split.length is 1", 'The value of __split[0] is " "'], }, { path: "test/built-ins/String/prototype/split/separator-colon-instance-is-string-one-1-two-2-four-4.js", code: `const result = "one-1,two-2,four-4".split(":"); return [result.length, result[0]]`, expected: [1, "one-1,two-2,four-4"], labels: ["The value of __split.length is 1", 'The value of __split[0] is "one-1,two-2,four-4"'], }, { path: "test/built-ins/String/prototype/split/separator-comma-instance-is-string-one-two-three-four-five.js", code: `const result = "one,two,three,four,five".split(","); return [result.length, ...result]`, expected: [5, "one", "two", "three", "four", "five"], labels: [ "The value of __split.length is 5", 'The value of __split[0] is "one"', 'The value of __split[1] is "two"', 'The value of __split[2] is "three"', 'The value of __split[3] is "four"', 'The value of __split[4] is "five"', ], }, { path: "test/built-ins/String/prototype/split/separator-empty-string-instance-is-string.js", code: `const result = " ".split(""); return [result.length, result[0]]`, expected: [1, " "], labels: ["The value of __split.length is 1", 'The value of __split[0] is " "'], }, { path: "test/built-ins/String/prototype/split/call-split-without-arguments-and-instance-is-empty-string.js", code: `const result = "".split(); return [result.length, result[0]]`, expected: [1, ""], labels: ["The value of __split.length is 1", 'The value of __split[0] is ""'], }, { path: "test/built-ins/String/prototype/split/separator-undef.js", code: `const result = "undefined is not a function".split(); return [Array.isArray(result), result.length, result[0]]`, expected: [true, 1, "undefined is not a function"], labels: [ "implicit separator, result is array", "implicit separator, result.length", "implicit separator, [0] is the same string", ], }, { path: "test/built-ins/String/prototype/slice/S15.5.4.13_A1_T6.js", code: `return ["undefined".slice(undefined, 3)]`, expected: ["und"], labels: ['#1: new String("undefined").slice(x,3) === "und"'], }, { path: "test/built-ins/String/prototype/slice/S15.5.4.13_A1_T14.js", code: `return ["report".slice(undefined)]`, expected: ["report"], labels: ['#1: "report".slice(function(){}()) === "report"'], }, { path: "test/built-ins/String/prototype/slice/S15.5.4.13_A2_T1.js", code: `return [typeof "this is a string object".slice()]`, expected: ["string"], labels: ['#1: typeof __string.slice() === "string"'], }, { path: "test/built-ins/String/prototype/slice/S15.5.4.13_A2_T2.js", code: `return ["this is a string object".slice(NaN, Infinity)]`, expected: ["this is a string object"], labels: ['#1: __string.slice(NaN, Infinity) === "this is a string object"'], }, { path: "test/built-ins/String/prototype/slice/S15.5.4.13_A2_T3.js", code: `return ["".slice(1, 0)]`, expected: [""], labels: ['#1: __string.slice(1,0) === ""'], }, { path: "test/built-ins/String/prototype/slice/S15.5.4.13_A2_T4.js", code: `return ["this is a string object".slice(Infinity, NaN)]`, expected: [""], labels: ['#1: __string.slice(Infinity, NaN) === ""'], }, { path: "test/built-ins/String/prototype/slice/S15.5.4.13_A2_T5.js", code: `return ["this is a string object".slice(Infinity, Infinity)]`, expected: [""], labels: ['#1: __string.slice(Infinity, Infinity) === ""'], }, { path: "test/built-ins/String/prototype/slice/S15.5.4.13_A2_T6.js", code: `return ["this is a string object".slice(-0.01, 0)]`, expected: [""], labels: ['#1: __string.slice(-0.01,0) === ""'], }, { path: "test/built-ins/String/prototype/slice/S15.5.4.13_A2_T7.js", code: `const text = "this is a string object"; return [text.slice(text.length, text.length)]`, expected: [""], labels: ['#1: __string.slice(__string.length, __string.length) === ""'], }, { path: "test/built-ins/String/prototype/slice/S15.5.4.13_A2_T8.js", code: `const text = "this is a string object"; return [text.slice(text.length + 1, 0)]`, expected: [""], labels: ['#1: __string.slice(__string.length+1, 0) === ""'], }, { path: "test/built-ins/String/prototype/slice/S15.5.4.13_A2_T9.js", code: `return ["this is a string object".slice(-Infinity, -Infinity)]`, expected: [""], labels: ['#1: __string.slice(-Infinity, -Infinity) === ""'], }, { path: "test/built-ins/String/prototype/substring/S15.5.4.15_A1_T6.js", code: `return ["undefined".substring(undefined, 3)]`, expected: ["und"], labels: ['#1: new String("undefined").substring(x,3) === "und"'], }, { path: "test/built-ins/String/prototype/substring/S15.5.4.15_A1_T14.js", code: `return ["report".substring(undefined)]`, expected: ["report"], labels: ['#1: "report".substring(function(){}()) === "report"'], }, { path: "test/built-ins/String/prototype/substring/S15.5.4.15_A2_T1.js", code: `return [typeof "this is a string object".substring()]`, expected: ["string"], labels: ['#1: typeof __string.substring() === "string"'], }, { path: "test/built-ins/String/prototype/substring/S15.5.4.15_A2_T2.js", code: `return ["this is a string object".substring(NaN, Infinity)]`, expected: ["this is a string object"], labels: ['#1: __string.substring(NaN, Infinity) === "this is a string object"'], }, { path: "test/built-ins/String/prototype/substring/S15.5.4.15_A2_T3.js", code: `return ["".substring(1, 0)]`, expected: [""], labels: ['#1: __string.substring(1,0) === ""'], }, { path: "test/built-ins/String/prototype/substring/S15.5.4.15_A2_T4.js", code: `return ["this is a string object".substring(Infinity, NaN)]`, expected: ["this is a string object"], labels: ['#1: __string.substring(Infinity, NaN) === "this is a string object"'], }, { path: "test/built-ins/String/prototype/substring/S15.5.4.15_A2_T5.js", code: `return ["this is a string object".substring(Infinity, Infinity)]`, expected: [""], labels: ['#1: __string.substring(Infinity, Infinity) === ""'], }, { path: "test/built-ins/String/prototype/substring/S15.5.4.15_A2_T6.js", code: `return ["this is a string object".substring(-0.01, 0)]`, expected: [""], labels: ['#1: __string.substring(-0.01,0) === ""'], }, { path: "test/built-ins/String/prototype/substring/S15.5.4.15_A2_T7.js", code: `const text = "this is a string object"; return [text.substring(text.length, text.length)]`, expected: [""], labels: ['#1: __string.substring(__string.length, __string.length) === ""'], }, { path: "test/built-ins/String/prototype/substring/S15.5.4.15_A2_T8.js", code: `const text = "this is a string object"; return [text.substring(text.length + 1, 0)]`, expected: ["this is a string object"], labels: ['#1: __string.substring(__string.length+1, 0) === "this is a string object"'], }, { path: "test/built-ins/String/prototype/substring/S15.5.4.15_A2_T9.js", code: `return ["this is a string object".substring(-Infinity, -Infinity)]`, expected: [""], labels: ['#1: __string.substring(-Infinity, -Infinity) === ""'], }, { path: "test/built-ins/String/prototype/substring/S15.5.4.15_A2_T10.js", code: `return ["this_is_a_string object".substring(0, 8)]`, expected: ["this_is_"], labels: ['#1: __string.substring(0,8) === "this_is_"'], }, { path: "test/built-ins/String/prototype/includes/String.prototype.includes_FailMissingLetter.js", code: `return ["word".includes("a", 0)]`, expected: [false], labels: ['"word".includes("a", 0)'], }, { path: "test/built-ins/String/prototype/includes/String.prototype.includes_SuccessNoLocation.js", code: `return ["word".includes("w")]`, expected: [true], labels: ['"word".includes("w")'], }, { path: "test/built-ins/String/prototype/includes/String.prototype.includes_FailBadLocation.js", code: `return ["word".includes("w", 5)]`, expected: [false], labels: ['"word".includes("w", 5)'], }, { path: "test/built-ins/String/prototype/includes/String.prototype.includes_FailLocation.js", code: `return ["word".includes("o", 3)]`, expected: [false], labels: ['"word".includes("o", 3)'], }, { path: "test/built-ins/String/prototype/includes/String.prototype.includes_Success.js", code: `return ["word".includes("w", 0)]`, expected: [true], labels: ['"word".includes("w", 0)'], }, { path: "test/built-ins/String/prototype/includes/searchstring-found-with-position.js", code: `const text = "The future is cool!"; return [text.includes("The future", 0), text.includes(" is ", 1), text.includes("cool!", 10)]`, expected: [true, true, true], labels: [ 'Returns true for str.includes("The future", 0)', 'Returns true for str.includes(" is ", 1)', 'Returns true for str.includes("cool!", 10)', ], }, { path: "test/built-ins/String/prototype/includes/searchstring-found-without-position.js", code: `const text = "The future is cool!"; return [text.includes("The future"), text.includes("is cool!"), text.includes(text)]`, expected: [true, true, true], labels: [ 'Returns true for str.includes("The future")', 'Returns true for str.includes("is cool!")', "Returns true for str.includes(str)", ], }, { path: "test/built-ins/String/prototype/includes/searchstring-not-found-with-position.js", code: `const text = "The future is cool!"; return [text.includes("The future", 1), text.includes(text, 1)]`, expected: [false, false], labels: ['Returns false on str.includes("The future", 1)', "Returns false on str.includes(str, 1)"], }, { path: "test/built-ins/String/prototype/includes/searchstring-not-found-without-position.js", code: `const text = "The future is cool!"; return [text.includes("Flash"), text.includes("FUTURE")]`, expected: [false, false], labels: ["Flash if not included", "includes is case sensitive"], }, { path: "test/built-ins/String/prototype/includes/return-false-with-out-of-bounds-position.js", code: `const text = "The future is cool!"; return [ text.includes("!", text.length + 1), text.includes("!", 100), text.includes("!", Infinity), text.includes("!", text.length), ]`, expected: [false, false, false, false], labels: [ 'str.includes("!", str.length + 1) returns false', 'str.includes("!", 100) returns false', 'str.includes("!", Infinity) returns false', 'str.includes("!", str.length) returns false', ], }, { path: "test/built-ins/String/prototype/includes/return-true-if-searchstring-is-empty.js", code: `const text = "The future is cool!"; return [text.includes("", text.length), text.includes(""), text.includes("", Infinity)]`, expected: [true, true, true], labels: [ 'str.includes("", str.length) returns true', 'str.includes("") returns true', 'str.includes("", Infinity) returns true', ], }, { path: "test/built-ins/String/prototype/includes/coerced-values-of-position.js", code: `const text = "The future is cool!"; return [ text.includes("The future", NaN), text.includes("The future", undefined), text.includes("The future", 0.4), text.includes("The future", -1), text.includes("The future", 1.4), ]`, expected: [true, true, true, true, false], labels: ["NaN coerced to 0", "undefined coerced to 0", "0.4 coerced to 0", "negative position", "1.4 coerced to 1"], }, { path: "test/built-ins/String/prototype/startsWith/searchstring-found-with-position.js", code: `const text = "The future is cool!"; return [text.startsWith("The future", 0), text.startsWith("future", 4), text.startsWith(" is cool!", 10)]`, expected: [true, true, true], labels: [ 'str.startsWith("The future", 0) === true', 'str.startsWith("future", 4) === true', 'str.startsWith(" is cool!", 10) === true', ], }, { path: "test/built-ins/String/prototype/startsWith/searchstring-found-without-position.js", code: `const text = "The future is cool!"; return [text.startsWith("The "), text.startsWith("The future"), text.startsWith(text)]`, expected: [true, true, true], labels: [ 'str.startsWith("The ") === true', 'str.startsWith("The future") === true', "str.startsWith(str) === true", ], }, { path: "test/built-ins/String/prototype/startsWith/searchstring-not-found-with-position.js", code: `const text = "The future is cool!"; return [text.startsWith("The future", 1), text.startsWith(text, 1)]`, expected: [false, false], labels: ['str.startsWith("The future", 1) === false', "str.startsWith(str, 1) === false"], }, { path: "test/built-ins/String/prototype/startsWith/searchstring-not-found-without-position.js", code: `const text = "The future is cool!"; return [text.startsWith("Flash"), text.startsWith("THE FUTURE"), text.startsWith("future is cool!")]`, expected: [false, false, false], labels: [ 'str.startsWith("Flash") === false', "startsWith is case sensitive", 'str.startsWith("future is cool!") === false', ], }, { path: "test/built-ins/String/prototype/startsWith/out-of-bounds-position.js", code: `const text = "The future is cool!"; return [ text.startsWith("!", text.length), text.startsWith("!", 100), text.startsWith("!", Infinity), text.startsWith("The future", -1), text.startsWith("The future", -Infinity), ]`, expected: [false, false, false, true, true], labels: [ 'str.startsWith("!", str.length) returns false', 'str.startsWith("!", 100) returns false', 'str.startsWith("!", Infinity) returns false', "position argument < 0 will search from the start of the string (-1)", "position argument < 0 will search from the start of the string (-Infinity)", ], }, { path: "test/built-ins/String/prototype/startsWith/return-true-if-searchstring-is-empty.js", code: `const text = "The future is cool!"; return [text.startsWith(""), text.startsWith("", text.length), text.startsWith("", Infinity)]`, expected: [true, true, true], labels: [ 'str.startsWith("") returns true', 'str.startsWith("", str.length) returns true', 'str.startsWith("", Infinity) returns true', ], }, { path: "test/built-ins/String/prototype/startsWith/coerced-values-of-position.js", code: `const text = "The future is cool!"; return [ text.startsWith("The future", NaN), text.startsWith("The future", undefined), text.startsWith("The future", 0.4), text.startsWith("The future", 1.4), ]`, expected: [true, true, true, false], labels: ["NaN coerced to 0", "undefined coerced to 0", "0.4 coerced to 0", "1.4 coerced to 1"], }, { path: "test/built-ins/String/prototype/endsWith/String.prototype.endsWith_Success.js", code: `return ["word".endsWith("d")]`, expected: [true], labels: ['"word".endsWith("d")'], }, { path: "test/built-ins/String/prototype/endsWith/String.prototype.endsWith_Success_2.js", code: `return ["word".endsWith("d", 4)]`, expected: [true], labels: ['"word".endsWith("d", 4)'], }, { path: "test/built-ins/String/prototype/endsWith/String.prototype.endsWith_Success_3.js", code: `return ["word".endsWith("d", 25)]`, expected: [true], labels: ['"word".endsWith("d", 25)'], }, { path: "test/built-ins/String/prototype/endsWith/String.prototype.endsWith_Success_4.js", code: `return ["word".endsWith("r", 3)]`, expected: [true], labels: ['"word".endsWith("r", 3)'], }, { path: "test/built-ins/String/prototype/endsWith/String.prototype.endsWith_Fail.js", code: `return ["word".endsWith("r")]`, expected: [false], labels: ['"word".endsWith("r")'], }, { path: "test/built-ins/String/prototype/endsWith/String.prototype.endsWith_Fail_2.js", code: `return ["word".endsWith("d", 3)]`, expected: [false], labels: ['"word".endsWith("d", 3)'], }, { path: "test/built-ins/String/prototype/endsWith/searchstring-found-with-position.js", code: `const text = "The future is cool!"; return [text.endsWith("The future", 10), text.endsWith("future", 10), text.endsWith(" is cool!", text.length)]`, expected: [true, true, true], labels: [ 'str.endsWith("The future", 10) === true', 'str.endsWith("future", 10) === true', 'str.endsWith(" is cool!", str.length) === true', ], }, { path: "test/built-ins/String/prototype/endsWith/searchstring-found-without-position.js", code: `const text = "The future is cool!"; return [text.endsWith("cool!"), text.endsWith("!"), text.endsWith(text)]`, expected: [true, true, true], labels: ['str.endsWith("cool!") === true', 'str.endsWith("!") === true', "str.endsWith(str) === true"], }, { path: "test/built-ins/String/prototype/endsWith/searchstring-not-found-with-position.js", code: `const text = "The future is cool!"; return [text.endsWith("is cool!", text.length - 1), text.endsWith("!", 1)]`, expected: [false, false], labels: ['str.endsWith("is cool!", str.length - 1) === false', 'str.endsWith("!", 1) === false'], }, { path: "test/built-ins/String/prototype/endsWith/searchstring-not-found-without-position.js", code: `const text = "The future is cool!"; return [text.endsWith("is Flash!"), text.endsWith("IS COOL!"), text.endsWith("The future")]`, expected: [false, false, false], labels: [ 'str.endsWith("is Flash!") === false', "endsWith is case sensitive", 'str.endsWith("The future") === false', ], }, { path: "test/built-ins/String/prototype/endsWith/return-false-if-search-start-is-less-than-zero.js", code: `return ["web".endsWith("w", 0), "Bob".endsWith(" Bob")]`, expected: [false, false], labels: ['"web".endsWith("w", 0) returns false', '"Bob".endsWith(" Bob") returns false'], }, { path: "test/built-ins/String/prototype/endsWith/return-true-if-searchstring-is-empty.js", code: `const text = "The future is cool!"; return [ text.endsWith(""), text.endsWith("", text.length), text.endsWith("", Infinity), text.endsWith("", -1), text.endsWith("", -Infinity), ]`, expected: [true, true, true, true, true], labels: [ 'str.endsWith("") returns true', 'str.endsWith("", str.length) returns true', 'str.endsWith("", Infinity) returns true', 'str.endsWith("", -1) returns true', 'str.endsWith("", -Infinity) returns true', ], }, { path: "test/built-ins/String/prototype/endsWith/coerced-values-of-position.js", code: `const text = "The future is cool!"; return [ text.endsWith("", NaN), text.endsWith("", undefined), text.endsWith("The future", 10.4), ]`, expected: [true, true, true], labels: ["NaN coerced to 0", "undefined coerced to 0", "10.4 coerced to 10"], }, { path: "test/built-ins/String/prototype/indexOf/S15.5.4.7_A2_T1.js", code: `return ["abcd".indexOf("abcdab")]`, expected: [-1], labels: ['#1: "abcd".indexOf("abcdab")===-1'], }, { path: "test/built-ins/String/prototype/indexOf/S15.5.4.7_A2_T2.js", code: `return ["abcd".indexOf("abcdab", 0)]`, expected: [-1], labels: ['#1: "abcd".indexOf("abcdab",0)===-1'], }, { path: "test/built-ins/String/prototype/indexOf/S15.5.4.7_A2_T3.js", code: `return ["abcd".indexOf("abcdab", 99)]`, expected: [-1], labels: ['#1: "abcd".indexOf("abcdab",99)===-1'], }, { path: "test/built-ins/String/prototype/indexOf/S15.5.4.7_A2_T4.js", code: `return ["abcd".indexOf("abcdab", NaN)]`, expected: [-1], labels: ['#1: "abcd".indexOf("abcdab",NaN)===-1'], }, { path: "test/built-ins/String/prototype/indexOf/S15.5.4.7_A3_T1.js", code: `return ["$$abcdabcd".indexOf("ab", NaN)]`, expected: [2], labels: ['#1: "$$abcdabcd".indexOf("ab",NaN)===2'], }, { path: "test/built-ins/String/prototype/indexOf/S15.5.4.7_A3_T3.js", code: `return ["$$abcdabcd".indexOf("ab", -Infinity)]`, expected: [2], labels: ['#1: "$$abcdabcd".indexOf("ab", function(){return -Infinity;}())===2'], }, { path: "test/built-ins/String/prototype/indexOf/position-tointeger.js", code: `return [ "aaaa".indexOf("aa", 0), "aaaa".indexOf("aa", 1), "aaaa".indexOf("aa", -0.9), "aaaa".indexOf("aa", 0.9), "aaaa".indexOf("aa", 1.9), "aaaa".indexOf("aa", NaN), "aaaa".indexOf("aa", Infinity), "aaaa".indexOf("aa", undefined), "aaaa".indexOf("aa", 2), "aaaa".indexOf("aa", 2.9), ]`, expected: [0, 1, 0, 0, 1, 0, -1, 0, 2, 2], labels: [ "position 0", "position 1", "ToInteger: truncate towards 0 (-0.9)", "ToInteger: truncate towards 0 (0.9)", "ToInteger: truncate towards 0 (1.9)", "ToInteger: NaN => 0", "position Infinity", "ToInteger: undefined => NaN => 0", "position 2", "ToInteger: truncate towards 0 (2.9)", ], }, { path: "test/built-ins/String/prototype/indexOf/searchstring-tostring.js", code: `return ["foo".indexOf(""), "__foo__".indexOf("foo")]`, expected: [0, 2], labels: ['"foo".indexOf("")', '"__foo__".indexOf("foo")'], }, { path: "test/built-ins/String/prototype/lastIndexOf/not-a-substring.js", code: `return ["abc".lastIndexOf("d")]`, expected: [-1], labels: [ "String.prototype.lastIndexOf returns -1 when searchString is shorter than this and searchString is not a substring of this.", ], },] as const
describe("Test262-adapted String search and extraction behavior", () => { for (const item of cases) { test(item.path, async () => { const actual = await value(item.code) if (!Array.isArray(actual)) throw new Error(`expected assertion values for ${item.path}`) expect(actual.length, "adapted assertion count").toBe(item.expected.length) item.expected.forEach((expected, index) => expect(actual[index], item.labels[index]!).toEqual(expected)) }) }})