dart2dart: Test cases for better code coverage in dart_tree rewritings.

tests/language/rewrite_conditional_test.dart

+// Copyright (c) 2014, 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';
+
+var global = 0;
+
+bar() {
+    global += 1;
+}
+baz() {
+    global += 100;
+}
+
+foo(x,y,z) {
+    if ((x ? false : true) ? y : z) {
+        bar();
+        bar();
+    } else {
+        baz();
+        baz();
+    }
+}
+
+foo2(x,y,z) {
+    return (x ? false : true) ? y : z;
+}
+
+foo3(x,y,z) {
+    if (x ? (z ? false : true) : (y ? false : true)) {
+        baz();
+        baz();
+    } else {
+        bar();
+        bar();
+    }
+}
+
+
+main() {
+    foo(true,true,true);
+    Expect.equals(2, global);
+
+    foo(true,true,false);
+    Expect.equals(202, global);
+
+    foo(true,false,true);
+    Expect.equals(204, global);
+
+    foo(true,false,false);
+    Expect.equals(404, global);
+
+    foo(false,true,true);
+    Expect.equals(406, global);
+
+    foo(false,true,false);
+    Expect.equals(408, global);
+
+    foo(false,false,true);
+    Expect.equals(608, global);
+
+    foo(false,false,false);
+    Expect.equals(808, global);
+
+    Expect.equals(true, foo2(true,true,true));
+    Expect.equals(false, foo2(true,true,false));
+    Expect.equals(true, foo2(true,false,true));
+    Expect.equals(false, foo2(true,false,false));
+    Expect.equals(true, foo2(false,true,true));
+    Expect.equals(true, foo2(false,true,false));
+    Expect.equals(false, foo2(false,false,true));
+    Expect.equals(false, foo2(false,false,false));
+
+    global = 0;
+    foo3(true,true,true);
+    Expect.equals(2, global);
+
+    foo3(true,true,false);
+    Expect.equals(202, global);
+
+    foo3(true,false,true);
+    Expect.equals(204, global);
+
+    foo3(true,false,false);
+    Expect.equals(404, global);
+
+    foo3(false,true,true);
+    Expect.equals(406, global);
+
+    foo3(false,true,false);
+    Expect.equals(408, global);
+
+    foo3(false,false,true);
+    Expect.equals(608, global);
+
+    foo3(false,false,false);
+    Expect.equals(808, global);
+}