Test for aliasing of typed data for setRange

tests/lib/typed_data/typed_data_setRange_test.dart

Index: tests/lib/typed_data/typed_data_setRange_test.dart
diff --git a/tests/lib/typed_data/typed_data_setRange_test.dart b/tests/lib/typed_data/typed_data_setRange_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..f593f7d178f1cb40d0033b4e02fae347d8a44978
--- /dev/null
+++ b/tests/lib/typed_data/typed_data_setRange_test.dart
@@ -0,0 +1,101 @@
+// Copyright (c) 2013, 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';
+import 'dart:typed_data';
+
+
+initialize(a) {
+  for (int i = 0; i < a.length; i++) {
+    a[i] = i + 1;
+  }
+}
+
+makeInt16View(buffer, byteOffset, length) =>
+    new Int16List.view(buffer, byteOffset, length);
+
+makeUint16View(buffer, byteOffset, length) =>
+    new Uint16List.view(buffer, byteOffset, length);
+
+
+sameTypeTest() {
+  checkSameSize(new Int16List(9), makeInt16View, makeInt16View);
+  checkSameSize(new Uint16List(9), makeUint16View, makeUint16View);
+}
+
+sameElementSizeTest() {
+  checkSameSize(new Int16List(9), makeInt16View, makeUint16View);
+  checkSameSize(new Int16List(9), makeUint16View, makeInt16View);
+}
+
+checkSameSize(a0, constructor1, constructor2) {
+  // Typed lists a1 and a2 share a buffer as follows (bytes):
+  //
+  //  a0:  aabbccddeeffgghhii
+  //  a1:  aabbccddeeffgg
+  //  a2:      aabbccddeeffgg
+
+  var buffer = a0.buffer;
+  var a1 = constructor1(buffer, 0, 7);
+  var a2 = constructor2(buffer, 2 * 2, 7);
+
+  initialize(a0);
+  Expect.equals('[1, 2, 3, 4, 5, 6, 7, 8, 9]', '$a0');
+  Expect.equals('[1, 2, 3, 4, 5, 6, 7]', '$a1');
+  Expect.equals('[3, 4, 5, 6, 7, 8, 9]', '$a2');
+
+  initialize(a0);
+  a1.setRange(0, 7, a2);
+  Expect.equals('[3, 4, 5, 6, 7, 8, 9, 8, 9]', '$a0');
+
+  initialize(a0);
+  a2.setRange(0, 7, a1);
+  Expect.equals('[1, 2, 1, 2, 3, 4, 5, 6, 7]', '$a0');
+
+  initialize(a0);
+  a1.setRange(1, 7, a2);
+  Expect.equals('[1, 3, 4, 5, 6, 7, 8, 8, 9]', '$a0');
+
+  initialize(a0);
+  a2.setRange(1, 7, a1);
+  Expect.equals('[1, 2, 3, 1, 2, 3, 4, 5, 6]', '$a0');
+
+  initialize(a0);
+  a1.setRange(0, 6, a2, 1);
+  Expect.equals('[4, 5, 6, 7, 8, 9, 7, 8, 9]', '$a0');
+
+  initialize(a0);
+  a2.setRange(0, 6, a1, 1);
+  Expect.equals('[1, 2, 2, 3, 4, 5, 6, 7, 9]', '$a0');
+}
+
+expandContractTest() {
+  // Copying between views that have different element sizes can't be done with
+  // a single scan-up or scan-down.
+  //
+  // Typed lists a1 and a2 share a buffer as follows:
+  //
+  // a1:  aaaabbbbccccddddeeeeffffgggghhhh
+  // a2:              abcdefgh
+
+  var a1 = new Int32List(8);
+  var buffer = a1.buffer;
+  var a2 = new Int8List.view(buffer, 12, 8);
+
+  initialize(a2);
+  Expect.equals('[1, 2, 3, 4, 5, 6, 7, 8]', '$a2');
+  a1.setRange(0, 8, a2);
+  Expect.equals('[1, 2, 3, 4, 5, 6, 7, 8]', '$a1');
+
+  initialize(a1);
+  Expect.equals('[1, 2, 3, 4, 5, 6, 7, 8]', '$a1');
+  a2.setRange(0, 8, a1);
+  Expect.equals('[1, 2, 3, 4, 5, 6, 7, 8]', '$a2');
+}
+
+main() {
+  sameTypeTest();
+  sameElementSizeTest();
+  expandContractTest();
+}