Add corelib tests

test/codegen/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);
+}