Add chunked conversion to converters.

tests/lib/convert/unicode_tests.dart

Index: tests/lib/convert/unicode_tests.dart
diff --git a/tests/lib/convert/utf8_encode_test.dart b/tests/lib/convert/unicode_tests.dart
similarity index 85%
copy from tests/lib/convert/utf8_encode_test.dart
copy to tests/lib/convert/unicode_tests.dart
index 3aa208c11641a937449a52f74bc377401d5e6aa8..582830737d04263861b75d0204f26f6071f3efba 100644
--- a/tests/lib/convert/utf8_encode_test.dart
+++ b/tests/lib/convert/unicode_tests.dart
@@ -2,9 +2,7 @@
 // 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.
 
-library utf8_test;
-import "package:expect/expect.dart";
-import 'dart:convert';
+library utf8_tests;
 
 // Google favorite: "Îñţérñåţîöñåļîžåţîờñ".
 const INTER_BYTES = const [0xc3, 0x8e, 0xc3, 0xb1, 0xc5, 0xa3, 0xc3, 0xa9, 0x72,
@@ -47,7 +45,7 @@ const ASCII_BYTES = const [ 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
                             0x79, 0x7A ];
 const ASCII_STRING = "abcdefghijklmnopqrstuvwxyz";
 
-const TESTS = const [
+const _TEST_PAIRS = const [
     const [ const [], "" ],
     const [ INTER_BYTES, INTER_STRING ],
     const [ BLUEBERRY_BYTES, BLUEBERRY_STRING ],
@@ -57,12 +55,11 @@ const TESTS = const [
     const [ DIGIT_BYTES, DIGIT_STRING ],
     const [ ASCII_BYTES, ASCII_STRING ]];
 
-List<int> encode(String str) => new Utf8Encoder().convert(str);
-List<int> encode2(String str) => UTF8.encode(str);
-
-main() {
-  Expect.equals(2, BEE_STRING.length);
-  var tests = TESTS.expand((test) {
+_expandTestPairs() {
+  assert(2 == BEE_STRING.length);
+  var tests = [];
+  tests.addAll(_TEST_PAIRS);
+  tests.addAll(_TEST_PAIRS.expand((test) {
     var bytes = test[0];
     var string = test[1];
     var longBytes = [];
@@ -72,11 +69,8 @@ main() {
       longString += string;
     }
     return [test, [longBytes, longString]];
-  });
-  for (var test in tests) {
-    List<int> bytes = test[0];
-    String string = test[1];
-    Expect.listEquals(bytes, encode(string));
-    Expect.listEquals(bytes, encode2(string));
-  }
+  }));
+  return tests;
 }
+
+final List UNICODE_TESTS = _expandTestPairs();