Migrated test block 29 to Dart 2.0

tests/corelib_2/string_test.dart

 // Copyright (c) 2011, 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.
 
 import "package:expect/expect.dart";
 
 void main() {
   testOutOfRange();
-  testIllegalArgument();
   testConcat();
   testIndex();
   testCodeUnitAt();
   testEquals();
   testEndsWith();
   testStartsWith();
   testIndexOf();
   testLastIndexOf();
   testContains();
   testReplaceAll();
@@ skipping 16 matching lines @@
   String a = "Hello";
   bool exception_caught = false;
   try {
     var c = a[20]; // Throw exception.
   } on RangeError catch (e) {
     exception_caught = true;
   }
   Expect.isTrue(exception_caught);
 }
 
-void testIllegalArgument() {
-  String a = "Hello";
-  bool exception_caught = false;
-  try {
-    var c = a[2.2]; // Throw exception.
-    Expect.fail("Accepting double as index");
-  } on ArgumentError catch (e) {
-    exception_caught = true;
-  } on TypeError catch (e) {
-    // Thrown in checked mode only.
-    exception_caught = true;
-  }
-  Expect.isTrue(exception_caught);
-}
-
 void testIndex() {
   String str = "string";
   for (int i = 0; i < str.length; i++) {
     Expect.isTrue(str[i] is String);
     testStringLength(1, str[i]);
   }
 }
 
 void testCodeUnitAt() {
   String str = "string";
@@ skipping 414 matching lines @@
   Expect.equals('a', ''.padRight(1, 'a'));
   Expect.equals('aaaaa', ''.padRight(5, 'a'));
   Expect.equals('', ''.padRight(-2, 'a'));
 
   Expect.equals('xyzxyzxyzxyzxyz', ''.padRight(5, 'xyz'));
   Expect.equals('axyzxyzxyzxyz', 'a'.padRight(5, 'xyz'));
   Expect.equals('aaxyzxyzxyz', 'aa'.padRight(5, 'xyz'));
   Expect.equals('aa\u{10002}\u{10002}\u{10002}', 'aa'.padRight(5, '\u{10002}'));
   Expect.equals('a', 'a'.padRight(10, ''));
 }