aaac7fed
 liuqimichale
add
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'use strict';
var test = require('tape');
var isRegex = require('./');
var hasToStringTag = typeof Symbol === 'function' && typeof Symbol.toStringTag === 'symbol';
test('not regexes', function (t) {
t.notOk(isRegex(), 'undefined is not regex');
t.notOk(isRegex(null), 'null is not regex');
t.notOk(isRegex(false), 'false is not regex');
t.notOk(isRegex(true), 'true is not regex');
t.notOk(isRegex(42), 'number is not regex');
t.notOk(isRegex('foo'), 'string is not regex');
t.notOk(isRegex([]), 'array is not regex');
t.notOk(isRegex({}), 'object is not regex');
t.notOk(isRegex(function () {}), 'function is not regex');
t.end();
});
test('@@toStringTag', { skip: !hasToStringTag }, function (t) {
var regex = /a/g;
var fakeRegex = {
toString: function () { return String(regex); },
valueOf: function () { return regex; }
};
fakeRegex[Symbol.toStringTag] = 'RegExp';
t.notOk(isRegex(fakeRegex), 'fake RegExp with @@toStringTag "RegExp" is not regex');
t.end();
});
test('regexes', function (t) {
t.ok(isRegex(/a/g), 'regex literal is regex');
t.ok(isRegex(new RegExp('a', 'g')), 'regex object is regex');
t.end();
});
test('does not mutate regexes', function (t) {
t.test('lastIndex is a marker object', function (st) {
var regex = /a/;
var marker = {};
regex.lastIndex = marker;
st.equal(regex.lastIndex, marker, 'lastIndex is the marker object');
st.ok(isRegex(regex), 'is regex');
st.equal(regex.lastIndex, marker, 'lastIndex is the marker object after isRegex');
st.end();
});
t.test('lastIndex is nonzero', function (st) {
var regex = /a/;
regex.lastIndex = 3;
st.equal(regex.lastIndex, 3, 'lastIndex is 3');
st.ok(isRegex(regex), 'is regex');
st.equal(regex.lastIndex, 3, 'lastIndex is 3 after isRegex');
st.end();
});
t.end();
});
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