Migrated test block 27 to Dart 2.0.

tests/corelib/string_codeunits_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";
-
-main() {
-  test(String s) {
-    List<int> units = s.codeUnits;
-    List<int> expectedUnits = <int>[];
-    for (int i = 0; i < s.length; i++) {
-      expectedUnits.add(s.codeUnitAt(i));
-    }
-
-    Expect.equals(s.length, units.length);
-    for (int i = 0; i < s.length; i++) {
-      Expect.equals(s.codeUnitAt(i), units.elementAt(i));
-    }
-
-    // for-in
-    var res = [];
-    for (int unit in units) {
-      res.add(unit);
-    }
-    Expect.listEquals(expectedUnits, res);
-
-    // .map
-    Expect.listEquals(expectedUnits.map((x) => x.toRadixString(16)).toList(),
-        units.map((x) => x.toRadixString(16)).toList());
-
-    if (s == "") {
-      Expect.throws(() => units.first, (e) => e is StateError);
-      Expect.throws(() => units.last, (e) => e is StateError);
-      Expect.throws(() => units[0], (e) => e is RangeError);
-      Expect.throws(() => units[0] = 499, (e) => e is UnsupportedError);
-      Expect.listEquals([], units.sublist(0, 0));
-      Expect.equals(-1, units.indexOf(42));
-      Expect.equals(-1, units.lastIndexOf(499));
-    } else {
-      Expect.equals(s.codeUnitAt(0), units.first);
-      Expect.equals(s.codeUnitAt(s.length - 1), units.last);
-      Expect.equals(s.codeUnitAt(0), units[0]);
-      Expect.throws(() {
-        units[0] = 499;
-      }, (e) => e is UnsupportedError);
-      List<int> sub = units.sublist(1);
-      Expect.listEquals(s.substring(1, s.length).codeUnits, sub);
-      Expect.equals(-1, units.indexOf(-1));
-      Expect.equals(0, units.indexOf(units[0]));
-      Expect.equals(-1, units.lastIndexOf(-1));
-      Expect.equals(
-          units.length - 1, units.lastIndexOf(units[units.length - 1]));
-    }
-
-    Iterable reversed = units.reversed;
-    int i = units.length - 1;
-    for (int codeUnit in reversed) {
-      Expect.equals(units[i--], codeUnit);
-    }
-  }
-
-  test("");
-  test("abc");
-  test("\x00\u0000\u{000000}");
-  test("\u{ffff}\u{10000}\u{10ffff}");
-  String string = new String.fromCharCodes(
-      [0xdc00, 0xd800, 61, 0xd9ab, 0xd9ab, 0xddef, 0xddef, 62, 0xdc00, 0xd800]);
-  test(string);
-  string = "\x00\x7f\xff\u0100\ufeff\uffef\uffff"
-      "\u{10000}\u{12345}\u{1d800}\u{1dc00}\u{1ffef}\u{1ffff}";
-  test(string);
-
-  // Reading each unit of a surrogate pair works.
-  var r = "\u{10000}".codeUnits;
-  var it = r.iterator;
-  Expect.isTrue(it.moveNext());
-  Expect.equals(0xD800, it.current);
-  Expect.isTrue(it.moveNext());
-  Expect.equals(0xDC00, it.current);
-}