Initial commit

node_modules/is-regex/test/index.js

@@ -0,0 +1,104 @@
+'use strict';
+
+var hasToStringTag = require('has-tostringtag/shams')();
+var forEach = require('foreach');
+var test = require('tape');
+var isRegex = require('..');
+
+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();
+});
+
+test('does not perform operations observable to Proxies', { skip: typeof Proxy !== 'function' }, function (t) {
+	var Handler = function () {
+		this.trapCalls = [];
+	};
+
+	forEach([
+		'defineProperty',
+		'deleteProperty',
+		'get',
+		'getOwnPropertyDescriptor',
+		'getPrototypeOf',
+		'has',
+		'isExtensible',
+		'ownKeys',
+		'preventExtensions',
+		'set',
+		'setPrototypeOf'
+	], function (trapName) {
+		Handler.prototype[trapName] = function () {
+			this.trapCalls.push(trapName);
+			return Reflect[trapName].apply(Reflect, arguments);
+		};
+	});
+
+	t.test('proxy of object', function (st) {
+		var handler = new Handler();
+		var proxy = new Proxy({ lastIndex: 0 }, handler);
+
+		st.equal(isRegex(proxy), false, 'proxy of plain object is not regex');
+		st.deepEqual(handler.trapCalls, ['getOwnPropertyDescriptor'], 'no unexpected proxy traps were triggered');
+		st.end();
+	});
+
+	t.test('proxy of RegExp instance', function (st) {
+		var handler = new Handler();
+		var proxy = new Proxy(/a/, handler);
+
+		st.equal(isRegex(proxy), false, 'proxy of RegExp instance is not regex');
+		st.deepEqual(handler.trapCalls, ['getOwnPropertyDescriptor'], 'no unexpected proxy traps were triggered');
+		st.end();
+	});
+
+	t.end();
+});