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- 'use strict';
-
- module.exports = function (trimLeft, t) {
- t.test('normal cases', function (st) {
- st.equal(trimLeft(' \t\na \t\n'), 'a \t\n', 'strips whitespace off the left side');
- st.equal(trimLeft('a'), 'a', 'noop when no whitespace');
-
- var allWhitespaceChars = '\x09\x0A\x0B\x0C\x0D\x20\xA0\u1680\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\u2028\u2029\uFEFF';
- st.equal(trimLeft(allWhitespaceChars + 'a' + allWhitespaceChars), 'a' + allWhitespaceChars, 'all expected whitespace chars are trimmed');
-
- st.end();
- });
-
- // see https://codeblog.jonskeet.uk/2014/12/01/when-is-an-identifier-not-an-identifier-attack-of-the-mongolian-vowel-separator/
- var mongolianVowelSeparator = '\u180E';
- t.test('unicode >= 4 && < 6.3', { skip: !(/^\s$/).test(mongolianVowelSeparator) }, function (st) {
- st.equal(trimLeft(mongolianVowelSeparator + 'a' + mongolianVowelSeparator), 'a' + mongolianVowelSeparator, 'mongolian vowel separator is whitespace');
- st.end();
- });
-
- t.test('zero-width spaces', function (st) {
- var zeroWidth = '\u200b';
- st.equal(trimLeft(zeroWidth), zeroWidth, 'zero width space does not trim');
- st.end();
- });
- };
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