Fixing tests of internal test suite.

tests/jerry-test-suite/15/15.02/15.02.03/15.02.03-003.js

@@ -30,4 +30,4 @@ for (prop in Object)
 if (delete Object.prototype)
   configurable = true;
 
-assert(writable || enumerable || configurable);
+assert(!writable && !enumerable && !configurable);

tests/jerry-test-suite/15/15.02/15.02.03/15.02.03-006.js

@@ -26,4 +26,4 @@ var object2 = {
 
 Object.freeze(object1);
 
-assert(Object.isExtensible(object1) && !Object.isExtensible(object2));
+assert(!Object.isExtensible(object1) && Object.isExtensible(object2));

tests/jerry-test-suite/15/15.02/15.02.03/15.02.03-010.js

@@ -13,9 +13,18 @@
 // limitations under the License.
 
 var a = new String("qwe");
+
 names = Object.getOwnPropertyNames(a);
-assert(names instanceof Array &&
-        names[0] === "0" &&
-        names[1] === "1" &&
-        names[2] === "2" &&
-        names[3] === "length");
+
+assert(names instanceof Array);
+
+var is_0 = false, is_1 = false, is_2 = false, is_length = false;
+for (var i = 0; i <= 3; i++)
+{
+  if (names[i] === "0") { is_0 = true; }
+  if (names[i] === "1") { is_1 = true; }
+  if (names[i] === "2") { is_2 = true; }
+  if (names[i] === "length") { is_length = true; }
+}
+
+assert (is_0 && is_1 && is_2 && is_length);

tests/jerry-test-suite/15/15.02/15.02.03/15.02.03-012.js

@@ -23,4 +23,5 @@ veryUsefulObject.method = function () {
   return "asdf";
 }
 
-assert(veryUsefulObject.property && veryUsefulObject.method());
+assert(veryUsefulObject.property === undefined);
+assert(veryUsefulObject.method === undefined);

tests/jerry-test-suite/15/15.02/15.02.03/15.02.03-021.js

@@ -49,4 +49,4 @@ for (p in emptyObject) {
 if (delete emptyObject.myProperty)
   isConfigurable = true;
 
-assert(isWritable || isEnumerable || isConfigurable);
+assert(!isWritable && !isEnumerable && !isConfigurable);