LayoutTests/js/script-tests/string-includes.js

description("This test checks the ES6 string functions startsWith(), endsWith(), and includes().");

// Test includes
shouldBe("String.prototype.includes.name", "'includes'");
shouldBe("String.prototype.includes.length", "1");
shouldBe("'foo bar'.includes('bar')", "true");
shouldBe("'foo bar'.includes('bar', 4)", "true");
shouldBe("'foo bar'.includes('ar', 5)", "true");
shouldBe("'foo bar'.includes('qux')", "false");
shouldBe("'foo bar'.includes('foo')", "true");
shouldBe("'foo bar'.includes('foo', 0)", "true");
shouldBe("'foo bar'.includes('foo', -1)", "true");
shouldBe("'foo bar'.includes('')", "true");
shouldBe("'foo bar'.includes()", "false");
shouldBe("'foo bar qux'.includes('qux', 7)", "true");
shouldBe("'foo bar qux'.includes('bar', 7)", "false");
shouldBe("'foo null bar'.includes()", "false");
shouldBe("'foo null bar'.includes(null)", "true");
shouldBe("'foo null bar'.includes(null)", "true");
shouldBe("'foo undefined bar'.includes()", "true");
shouldBe("'foo undefined bar'.includes(undefined)", "true");
shouldBe("'foo undefined bar'.includes()", "true");
shouldBe("'foo undefined bar'.includes()", "true");
shouldBe("'foo true bar'.includes(true)", "true");
shouldBe("'foo false bar'.includes(false)", "true");
shouldBe("'foo 1 bar'.includes(1)", "true");
shouldBe("'foo 1.1 bar'.includes(1.1)", "true");
shouldBe("'foo NaN bar'.includes(NaN)", "true");
shouldBe("'foo 1.0 bar'.includes(1.0)", "true");
shouldBe("'foo 1e+100 bar'.includes(1e+100)", "true");
shouldBe("'foo 1e100 bar'.includes(1e100)", "false");
shouldBe("'フーバー'.includes('ーバ')", "true");
shouldBe("'フーバー'.includes('クー')", "false");
shouldBeFalse("'abc'.includes('a', 'abc'.length)");
shouldBeFalse("'abc'.includes('a', Math.pow(2, 33))");
shouldBeFalse("'abc'.includes('a', Infinity)");
shouldBeTrue("'abc'.includes('ab', -Infinity)");
shouldBeFalse("'abc'.includes('cd', -Infinity)");
shouldBeTrue("'abc'.includes('ab', 0)");
shouldBeFalse("'abc'.includes('cd', 0)");

// Test startsWith
shouldBe("String.prototype.startsWith.name", "'startsWith'");
shouldBe("String.prototype.startsWith.length", "1");
shouldBe("'foo bar'.startsWith('foo')", "true");
shouldBe("'foo bar'.startsWith('foo', 0)", "true");
shouldBe("'foo bar'.startsWith('foo', -1)", "true");
shouldBe("'foo bar'.startsWith('oo', 1)", "true");
shouldBe("'foo bar'.startsWith('qux')", "false");
shouldBe("'foo bar'.startsWith('')", "true");
shouldBe("'foo bar'.startsWith()", "false");
shouldBe("'null'.startsWith()", "false");
shouldBe("'null'.startsWith(null)", "true");
shouldBe("'null bar'.startsWith(null)", "true");
shouldBe("'undefined'.startsWith()", "true");
shouldBe("'undefined'.startsWith(undefined)", "true");
shouldBe("'undefined bar'.startsWith()", "true");
shouldBe("'undefined bar'.startsWith()", "true");
shouldBe("'true bar'.startsWith(true)", "true");
shouldBe("'false bar'.startsWith(false)", "true");
shouldBe("'1 bar'.startsWith(1)", "true");
shouldBe("'1.1 bar'.startsWith(1.1)", "true");
shouldBe("'NaN bar'.startsWith(NaN)", "true");
shouldBe("'1e+100 bar'.startsWith(1e+100)", "true");
shouldBe("'1e100 bar'.startsWith(1e100)", "false");
shouldBe("'フーバー'.startsWith('フー')", "true");
shouldBe("'フーバー'.startsWith('バー')", "false");
shouldBe("'フーバー'.startsWith('abc')", "false");
shouldBe("'フーバー'.startsWith('abc', 1)", "false");
shouldBe("'foo bar'.startsWith('フー')", "false");
shouldBe("'foo bar'.startsWith('フー', 1)", "false");
shouldBeFalse("'abc'.startsWith('a', Infinity)");
shouldBeFalse("'abc'.startsWith('a', 1)");
shouldBeTrue("'abc'.startsWith('b', 1)");
shouldBeFalse("'abc'.startsWith('b', 2)");
shouldBeTrue("'abc'.startsWith('c', 2)");
shouldBeFalse("'abc'.startsWith('a', Math.pow(2, 33))");

// Test endsWith
shouldBe("String.prototype.endsWith.name", "'endsWith'");
shouldBe("String.prototype.endsWith.length", "1");
shouldBe("'foo bar'.endsWith('bar')", "true");
shouldBe("'foo bar'.endsWith('ba', 6)", "true");
shouldBe("'foo bar'.endsWith(' ba', 6)", "true");
shouldBe("'foo bar'.endsWith('foo bar')", "true");
shouldBe("'foo bar'.endsWith('foo bar', 7)", "true");
shouldBe("'foo bar'.endsWith('foo bar', 8)", "true");
shouldBe("'foo bar'.endsWith('foo bar', -1)", "false");
shouldBe("'foo bar'.endsWith('qux')", "false");
shouldBe("'foo bar'.endsWith('')", "true");
shouldBe("'foo bar'.endsWith()", "false");
shouldBe("'foo null'.endsWith()", "false");
shouldBe("'foo null'.endsWith(null)", "true");
shouldBe("'foo null'.endsWith(null)", "true");
shouldBe("'foo undefined'.endsWith()", "true");
shouldBe("'foo undefined'.endsWith(undefined)", "true");
shouldBe("'foo undefined'.endsWith()", "true");
shouldBe("'foo undefined'.endsWith()", "true");
shouldBe("'foo true'.endsWith(true)", "true");
shouldBe("'foo false'.endsWith(false)", "true");
shouldBe("'foo 1'.endsWith(1)", "true");
shouldBe("'foo 1.1'.endsWith(1.1)", "true");
shouldBe("'foo NaN'.endsWith(NaN)", "true");
shouldBe("'foo 1e+100'.endsWith(1e+100)", "true");
shouldBe("'foo 1e100'.endsWith(1e100)", "false");
shouldBe("'フーバー'.endsWith('バー')", "true");
shouldBe("'フーバー'.endsWith('フー')", "false");
shouldBe("'フーバー'.endsWith('abc')", "false");
shouldBe("'フーバー'.endsWith('abc')", "false");
shouldBe("'foo bar'.endsWith('フー')", "false");
shouldBe("'foo bar'.endsWith('フー', 3)", "false");
shouldBeTrue("'abc'.endsWith('bc', Infinity)");
shouldBeTrue("'abc'.endsWith('bc', Math.pow(2, 33))");
shouldBeFalse("'abc'.endsWith('a', 0)");
shouldBeTrue("'abc'.endsWith('a', 1)");
shouldBeFalse("'abc'.endsWith('b', 1)");
shouldBeTrue("'abc'.endsWith('b', 2)");
shouldBeFalse("'abc'.endsWith('bc', 2)");
shouldBeTrue("'abc'.endsWith('bc', 3)");

// Call functions with an environment record as 'this'.
shouldThrow("(function() { var f = String.prototype.startsWith; (function() { f('a'); })(); })()");
shouldThrow("(function() { var f = String.prototype.endsWith; (function() { f('a'); })(); })()");
shouldThrow("(function() { var f = String.prototype.includes; (function() { f('a'); })(); })()");

// ES6 spec says a regex as argument should throw an Exception.
shouldThrow("'foo bar'.startsWith(/\w+/)");
shouldThrow("'foo bar'.endsWith(/\w+/)");
shouldThrow("'foo bar'.includes(/\w+/)");

// Check side effects in startsWith.
var sideEffect = "";
var stringToSearchIn = new String("foo bar");
stringToSearchIn.toString = function() {
    sideEffect += "A";
    return this;
}
var searchString = new String("foo");
searchString.toString = function() {
    sideEffect += "B";
    return this;
}
var startOffset = new Number(0);
startOffset.valueOf = function() {
    sideEffect += "C";
    return this;
}
// Calling stringToSearchIn.startsWith implicitly calls stringToSearchIn.toString(),
// searchString.toString() and startOffset.valueOf(), in that respective order.
shouldBe("stringToSearchIn.startsWith(searchString, startOffset)", "true");
shouldBe("sideEffect == 'ABC'", "true");

// If stringToSearchIn throws an exception searchString.toString() and
// startOffset.valueOf() are not called.
stringToSearchIn.toString = function() {
    throw "error";
}
sideEffect = "";
shouldThrow("stringToSearchIn.startsWith(searchString, startOffset)", "'error'");
shouldBe("sideEffect == ''", "true");

// If searchString throws an exception stringToSearchIn.toString() is called but
// startOffset.valueOf() is not.
stringToSearchIn.toString = function() {
    sideEffect += "A";
    return this;
}
searchString.toString = function() {
    throw "error";
}
sideEffect = "";
shouldThrow("stringToSearchIn.startsWith(searchString, startOffset)", "'error'");
shouldBe("sideEffect == 'A'", "true");

// If startOffset.valueOf() throws an exception stringToSearchIn.toString() and
// searchString.toString() were called.
stringToSearchIn.toString = function() {
    sideEffect += "A";
    return this;
}
searchString.toString = function() {
    sideEffect += "B";
    return this;
}
startOffset.valueOf = function() {
    throw "error";
}
sideEffect = "";
shouldThrow("stringToSearchIn.startsWith(searchString, startOffset)", "'error'");
shouldBe("sideEffect == 'AB'", "true");

// Check side effects in endsWith.
sideEffect = "";
stringToSearchIn = new String('foo bar');
stringToSearchIn.toString = function() {
    sideEffect += "A";
    return this;
}
searchString = new String('bar');
searchString.toString = function() {
    sideEffect += "B";
    return this;
}
var endOffset = new Number(stringToSearchIn.length);
endOffset.valueOf = function() {
    sideEffect += "C";
    return this;
}

// Calling stringToSearchIn.endsWith implicitly calls stringToSearchIn.toString(),
// searchString.toString() and endOffset.valueOf(), in that respective order.
shouldBe("stringToSearchIn.endsWith(searchString, endOffset)", "true");
shouldBe("sideEffect == 'ABC'", "true");

// If stringToSearchIn throws an exception searchString.toString() and
// endOffset.valueOf() are not called.
stringToSearchIn.toString = function() {
    throw "error";
}
sideEffect = "";
shouldThrow("stringToSearchIn.endsWith(searchString, endOffset)", "'error'");
shouldBe("sideEffect == ''", "true");

// If searchString throws an exception stringToSearchIn.toString() is called but
// endOffset.valueOf() is not.
stringToSearchIn.toString = function() {
    sideEffect += "A";
    return this;
}
searchString.toString = function() {
    throw "error";
}
sideEffect = "";
shouldThrow("stringToSearchIn.endsWith(searchString, endOffset)", "'error'");
shouldBe("sideEffect == 'A'", "true");

// If endOffset.valueOf() throws an exception stringToSearchIn.toString() and
// searchString.toString() were called.
stringToSearchIn.toString = function() {
    sideEffect += "A";
    return this;
}
searchString.toString = function() {
    sideEffect += "B";
    return this;
}
endOffset.valueOf = function() {
    throw "error";
}
sideEffect = "";
shouldThrow("stringToSearchIn.endsWith(searchString, endOffset)", "'error'");
shouldBe("sideEffect == 'AB'", "true");

// Check side effects in includes.
var sideEffect = "";
stringToSearchIn = new String("foo bar");
stringToSearchIn.toString = function() {
    sideEffect += "A";
    return this;
}
searchString = new String("foo");
searchString.toString = function() {
    sideEffect += "B";
    return this;
}
var startOffset = new Number(0);
startOffset.valueOf = function() {
    sideEffect += "C";
    return this;
}
// Calling stringToSearchIn.includes implicitly calls stringToSearchIn.toString(),
// searchString.toString() and startOffset.valueOf(), in that respective order.
shouldBe("stringToSearchIn.includes(searchString, startOffset)", "true");
shouldBe("sideEffect == 'ABC'", "true");

// If stringToSearchIn throws an exception searchString.toString() and
// startOffset.valueOf() are not called.
stringToSearchIn.toString = function() {
    throw "error";
}
sideEffect = "";
shouldThrow("stringToSearchIn.includes(searchString, startOffset)", "'error'");
shouldBe("sideEffect == ''", "true");

// If searchString throws an exception stringToSearchIn.toString() is called but
// startOffset.valueOf() is not.
stringToSearchIn.toString = function() {
    sideEffect += "A";
    return this;
}
searchString.toString = function() {
    throw "error";
}
sideEffect = "";
shouldThrow("stringToSearchIn.includes(searchString, startOffset)", "'error'");
shouldBe("sideEffect == 'A'", "true");

// If startOffset.valueOf() throws an exception stringToSearchIn.toString() and
// searchString.toString() were called.
stringToSearchIn.toString = function() {
    sideEffect += "A";
    return this;
}
searchString.toString = function() {
    sideEffect += "B";
    return this;
}
startOffset.valueOf = function() {
    throw "error";
}
sideEffect = "";
shouldThrow("stringToSearchIn.includes(searchString, startOffset)", "'error'");
shouldBe("sideEffect == 'AB'", "true");