Added unit tests of Symbol.species for various built-ins

`Map`, `Array`, `RegExp`, and `Promise`

testsrc/jstests/es6/array.js

@@ -17,4 +17,9 @@ var a = Array.from(Array(2));
 assertTrue(0 in a);
 assertEquals(a.map(_ => 'a'), ['a', 'a']);
 
+(function TestSymbolSpecies() {
+	var symbolSpeciesValue = Array[Symbol.species];
+	assertEquals(Array, symbolSpeciesValue);
+})();
+
 "success";

testsrc/jstests/es6/map.js

@@ -130,4 +130,9 @@ function logElement(value, key, m) {
   }
 })();
 
+(function TestSymbolSpecies() {
+  var symbolSpeciesValue = Map[Symbol.species];
+  assertEquals(Map, symbolSpeciesValue);
+})();
+
 "success";

testsrc/jstests/es6/promises.js

@@ -998,6 +998,11 @@ function assertAsyncDone(iteration) {
   assertEquals(1, callCount);
 })();
 
-assertAsyncDone()
+assertAsyncDone();
+
+(function TestSymbolSpecies() {
+  var symbolSpeciesValue = Promise[Symbol.species];
+  assertEquals(Promise, symbolSpeciesValue);
+})();
 
 'success';

testsrc/jstests/es6/regexp.js

@@ -0,0 +1,8 @@
+load('testsrc/assert.js');
+
+(function TestSymbolSpecies() {
+  var symbolSpeciesValue = RegExp[Symbol.species];
+  assertEquals(RegExp, symbolSpeciesValue);
+})();
+
+'success';

testsrc/org/mozilla/javascript/tests/es6/RegExpBasicTest.java

@@ -0,0 +1,14 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.javascript.tests.es6;
+
+import org.mozilla.javascript.Context;
+import org.mozilla.javascript.drivers.LanguageVersion;
+import org.mozilla.javascript.drivers.RhinoTest;
+import org.mozilla.javascript.drivers.ScriptTestsBase;
+
+@RhinoTest("testsrc/jstests/es6/regexp.js")
+@LanguageVersion(Context.VERSION_ES6)
+public class RegExpBasicTest extends ScriptTestsBase {}