Add tests for generic methods in strong mode

tests/language_strong/generic_methods_recursive_bound_test.dart

+// Copyright (c) 2017, 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.
+
+library generic_methods_f_bounded_test;
+
+import "package:expect/expect.dart";
+
+abstract class Ordered<T> {
+  bool operator <(T x);
+}
+
+void bubbleSort<T extends Ordered<T>>(List<T> a) {
+  for (int n = a.length; n > 1; n--) {
+    for (int i = 1; i < n; i++) {
+      if (a[i] < a[i - 1]) {
+        T t = a[i];
+        a[i] = a[i - 1];
+        a[i - 1] = t;
+      }
+    }
+  }
+}
+
+class MyNum implements Ordered<MyNum> {
+  final num x;
+  MyNum(this.x);
+
+  @override
+  bool operator <(MyNum other) {
+    return x < other.x;
+  }
+}
+
+main() {
+  List<MyNum> list = <MyNum>[
+    new MyNum(5),
+    new MyNum(4),
+    new MyNum(3),
+    new MyNum(2),
+    new MyNum(1)
+  ];
+  bubbleSort<MyNum>(list);
+
+  Expect.isTrue(list[0].x == 1);

[floitsch, 2017/03/09 11:27:17]

Expect.listEquals

[Dmitry Stefantsov, 2017/03/10 13:21:55]

Yes. My comments from above apply here as well.

+  Expect.isTrue(list[1].x == 2);
+  Expect.isTrue(list[2].x == 3);
+  Expect.isTrue(list[3].x == 4);
+  Expect.isTrue(list[4].x == 5);
+
+  dynamic someSort = bubbleSort;
+  List<int> list2 = <int>[5, 4, 3, 2, 1];
+  // int does not extend Ordered<int>

[floitsch, 2017/03/09 11:27:17]

Try to start with upper case, and finish with ".".

[Dmitry Stefantsov, 2017/03/10 13:21:55]

Done.

+  Expect.throws(() => someSort<int>(list2), (e) => e is TypeError);
+}