JS stdlib: added test for using special names(i.e. Object.prototype members) in Maps and Sets. Fixed the support special names in PrimitiveHashMap.

libraries/stdlib/test/js/SetJsTest.kt

@@ -22,6 +22,8 @@ abstract class SetJsTest {
     val data: Set<String> = createTestMutableSet()
     val empty: Set<String> = createEmptyMutableSet()
 
+    val SPECIAL_NAMES = array("__proto__", "constructor", "toString", "toLocaleString", "valueOf", "hasOwnProperty", "isPrototypeOf", "propertyIsEnumerable")
+
     Test fun size() {
         assertEquals(2, data.size())
         assertEquals(0, empty.size())
@@ -122,6 +124,32 @@ abstract class SetJsTest {
         assertTrue(data.isEmpty())
     }
 
+    Test fun specialNamesNotContainsInEmptySet() {
+        for (element in SPECIAL_NAMES) {
+            assertFalse(empty.contains(element), "unexpected element: $element")
+        }
+    }
+
+    Test fun specialNamesNotContainsInNonEmptySet() {
+        for (element in SPECIAL_NAMES) {
+            assertFalse(data.contains(element), "unexpected element: $element")
+        }
+    }
+
+    Test fun putAndGetSpecialNamesToSet() {
+        val s = createTestMutableSet()
+
+        for (element in SPECIAL_NAMES) {
+            assertFalse(s.contains(element), "unexpected element: $element")
+
+            s.add(element)
+            assertTrue(s.contains(element), "element not found: $element")
+
+            s.remove(element)
+            assertFalse(s.contains(element), "unexpected element after remove: $element")
+        }
+    }
+
     //Helpers
     abstract fun createEmptyMutableSet(): MutableSet<String>