source: trip-planner-front/node_modules/is-regex/test/index.js@ eed0bf8

Last change on this file since eed0bf8 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

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Line 
1'use strict';
2
3var hasToStringTag = require('has-tostringtag/shams')();
4var forEach = require('foreach');
5var test = require('tape');
6var isRegex = require('..');
7
8test('not regexes', function (t) {
9 t.notOk(isRegex(), 'undefined is not regex');
10 t.notOk(isRegex(null), 'null is not regex');
11 t.notOk(isRegex(false), 'false is not regex');
12 t.notOk(isRegex(true), 'true is not regex');
13 t.notOk(isRegex(42), 'number is not regex');
14 t.notOk(isRegex('foo'), 'string is not regex');
15 t.notOk(isRegex([]), 'array is not regex');
16 t.notOk(isRegex({}), 'object is not regex');
17 t.notOk(isRegex(function () {}), 'function is not regex');
18 t.end();
19});
20
21test('@@toStringTag', { skip: !hasToStringTag }, function (t) {
22 var regex = /a/g;
23 var fakeRegex = {
24 toString: function () { return String(regex); },
25 valueOf: function () { return regex; }
26 };
27 fakeRegex[Symbol.toStringTag] = 'RegExp';
28 t.notOk(isRegex(fakeRegex), 'fake RegExp with @@toStringTag "RegExp" is not regex');
29 t.end();
30});
31
32test('regexes', function (t) {
33 t.ok(isRegex(/a/g), 'regex literal is regex');
34 t.ok(isRegex(new RegExp('a', 'g')), 'regex object is regex');
35 t.end();
36});
37
38test('does not mutate regexes', function (t) {
39 t.test('lastIndex is a marker object', function (st) {
40 var regex = /a/;
41 var marker = {};
42 regex.lastIndex = marker;
43 st.equal(regex.lastIndex, marker, 'lastIndex is the marker object');
44 st.ok(isRegex(regex), 'is regex');
45 st.equal(regex.lastIndex, marker, 'lastIndex is the marker object after isRegex');
46 st.end();
47 });
48
49 t.test('lastIndex is nonzero', function (st) {
50 var regex = /a/;
51 regex.lastIndex = 3;
52 st.equal(regex.lastIndex, 3, 'lastIndex is 3');
53 st.ok(isRegex(regex), 'is regex');
54 st.equal(regex.lastIndex, 3, 'lastIndex is 3 after isRegex');
55 st.end();
56 });
57
58 t.end();
59});
60
61test('does not perform operations observable to Proxies', { skip: typeof Proxy !== 'function' }, function (t) {
62 var Handler = function () {
63 this.trapCalls = [];
64 };
65
66 forEach([
67 'defineProperty',
68 'deleteProperty',
69 'get',
70 'getOwnPropertyDescriptor',
71 'getPrototypeOf',
72 'has',
73 'isExtensible',
74 'ownKeys',
75 'preventExtensions',
76 'set',
77 'setPrototypeOf'
78 ], function (trapName) {
79 Handler.prototype[trapName] = function () {
80 this.trapCalls.push(trapName);
81 return Reflect[trapName].apply(Reflect, arguments);
82 };
83 });
84
85 t.test('proxy of object', function (st) {
86 var handler = new Handler();
87 var proxy = new Proxy({ lastIndex: 0 }, handler);
88
89 st.equal(isRegex(proxy), false, 'proxy of plain object is not regex');
90 st.deepEqual(handler.trapCalls, ['getOwnPropertyDescriptor'], 'no unexpected proxy traps were triggered');
91 st.end();
92 });
93
94 t.test('proxy of RegExp instance', function (st) {
95 var handler = new Handler();
96 var proxy = new Proxy(/a/, handler);
97
98 st.equal(isRegex(proxy), false, 'proxy of RegExp instance is not regex');
99 st.deepEqual(handler.trapCalls, ['getOwnPropertyDescriptor'], 'no unexpected proxy traps were triggered');
100 st.end();
101 });
102
103 t.end();
104});
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