Hide internal details of VM string implementation.

tests/corelib/string_base_vm_test.dart

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 // Dart test program for testing class 'StringBase' (currently VM specific).
 
 #library("StringBaseTest.dart");
-#import("dart:coreimpl");
-
 
 class StringBaseTest {
 
   StringBaseTest() {}
 
   toString() {
     return "StringBase Tester";
   }
-  static testSubstringMatches() {
-    Expect.equals(true, "Hello".substringMatches(0, "Hello"));
-    Expect.equals(true, "Hello World".substringMatches(0, "Hello"));
-    Expect.equals(false, "My Hello World".substringMatches(0, "Hello"));
-    Expect.equals(true, "My Hello World".substringMatches(6, "lo W"));
-    Expect.equals(false, "Hello".substringMatches(0, "low"));
-  }
 
   static testInterpolation() {
     var answer = 40 + 2;
     var s = "The answer is $answer.";
     Expect.equals("The answer is 42.", s);
 
     int numBottles = 33;
     String wall = "wall";
     s = "${numBottles*3} bottles of beer on the $wall.";
     Expect.equals("99 bottles of beer on the wall.", s);
   }
 
   static testCreation() {
     String s = "Hello";
     List<int> a = new List(s.length);
     List<int> ga  = new List();
     bool exception_caught = false;
     for (int i = 0; i < a.length; i++) {
       a[i] = s.charCodeAt(i);
       ga.add(s.charCodeAt(i));
     }
-    String s2 = StringBase.createFromCharCodes(a);
-    Expect.equals(s, s2);
-    String s3 = StringBase.createFromCharCodes(ga);
-    Expect.equals(s, s3);
     try {
       String s4 = new String.fromCharCodes([0.0]);
     } on ArgumentError catch (ex) {
       exception_caught = true;
     }
     Expect.equals(true, exception_caught);
     exception_caught = false;
     try {
       String s4 = new String.fromCharCodes([-1]);
     } on ArgumentError catch (ex) {
@@ skipping 16 matching lines @@
     exception_caught = false;
     try {
       s.substring(5, 4);
     } on IndexOutOfRangeException catch (ex) {
       exception_caught = true;
     }
     Expect.equals(true, exception_caught);
   }
 
   static void testMain() {
-    testSubstringMatches();
     testInterpolation();
     testCreation();
     testSubstring();
   }
 }
 
 main() {
   StringBaseTest.testMain();
 }