src/v8/test/webkit/string-trim.js

// Copyright 2013 the V8 project authors. All rights reserved.
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description("This test checks String.trim(), String.trimLeft() and String.trimRight() methods.");

//references to trim(), trimLeft() and trimRight() functions for testing Function's *.call() and *.apply() methods
var trim            = String.prototype.trim;
var trimLeft        = String.prototype.trimLeft;
var trimRight       = String.prototype.trimRight;

var testString      = 'foo bar';
var trimString      = '';
var leftTrimString  = '';
var rightTrimString = '';
var wsString        = '';

var whitespace      = [
    {s : '\u0009', t : 'HORIZONTAL TAB'},
    {s : '\u000A', t : 'LINE FEED OR NEW LINE'},
    {s : '\u000B', t : 'VERTICAL TAB'},
    {s : '\u000C', t : 'FORMFEED'},
    {s : '\u000D', t : 'CARRIAGE RETURN'},
    {s : '\u0020', t : 'SPACE'},
    {s : '\u00A0', t : 'NO-BREAK SPACE'},
    {s : '\u2000', t : 'EN QUAD'},
    {s : '\u2001', t : 'EM QUAD'},
    {s : '\u2002', t : 'EN SPACE'},
    {s : '\u2003', t : 'EM SPACE'},
    {s : '\u2004', t : 'THREE-PER-EM SPACE'},
    {s : '\u2005', t : 'FOUR-PER-EM SPACE'},
    {s : '\u2006', t : 'SIX-PER-EM SPACE'},
    {s : '\u2007', t : 'FIGURE SPACE'},
    {s : '\u2008', t : 'PUNCTUATION SPACE'},
    {s : '\u2009', t : 'THIN SPACE'},
    {s : '\u200A', t : 'HAIR SPACE'},
    {s : '\u3000', t : 'IDEOGRAPHIC SPACE'},
    {s : '\u2028', t : 'LINE SEPARATOR'},
    {s : '\u2029', t : 'PARAGRAPH SEPARATOR'},
    {s : '\u200B', t : 'ZERO WIDTH SPACE (category Cf)'}
];

for (var i = 0; i < whitespace.length; i++) {
    shouldBe("whitespace["+i+"].s.trim()", "''");
    shouldBe("whitespace["+i+"].s.trimLeft()", "''");
    shouldBe("whitespace["+i+"].s.trimRight()", "''");
    wsString += whitespace[i].s;
}

trimString      = wsString   + testString + wsString;
leftTrimString  = testString + wsString;   //trimmed from the left
rightTrimString = wsString   + testString; //trimmed from the right

shouldBe("wsString.trim()",      "''");
shouldBe("wsString.trimLeft()",  "''");
shouldBe("wsString.trimRight()", "''");

shouldBe("trimString.trim()",      "testString");
shouldBe("trimString.trimLeft()",  "leftTrimString");
shouldBe("trimString.trimRight()", "rightTrimString");

shouldBe("leftTrimString.trim()",      "testString");
shouldBe("leftTrimString.trimLeft()",  "leftTrimString");
shouldBe("leftTrimString.trimRight()", "testString");

shouldBe("rightTrimString.trim()",      "testString");
shouldBe("rightTrimString.trimLeft()",  "testString");
shouldBe("rightTrimString.trimRight()", "rightTrimString");

var testValues = ["0", "Infinity", "NaN", "true", "false", "({})", "({toString:function(){return 'wibble'}})", "['an','array']"];
for (var i = 0; i < testValues.length; i++) {
    shouldBe("trim.call("+testValues[i]+")", "'"+eval(testValues[i])+"'");
    shouldBe("trimLeft.call("+testValues[i]+")", "'"+eval(testValues[i])+"'");
    shouldBe("trimRight.call("+testValues[i]+")", "'"+eval(testValues[i])+"'");
}