Add Future.doWhile to dart:async.

tests/lib/async/futures_test.dart

Index: tests/lib/async/futures_test.dart
diff --git a/tests/lib/async/futures_test.dart b/tests/lib/async/futures_test.dart
index 21121206d4469e4297f68fd4d81b19d554f89b2f..c703780ebfcc35311bf89c10993af126e26786ff 100644
--- a/tests/lib/async/futures_test.dart
+++ b/tests/lib/async/futures_test.dart
@@ -184,6 +184,14 @@ Future testForEach() {
   }).then((_) => Expect.listEquals([1, 2, 3, 4, 5], seen));
 }
 
+Future testForEachSync() {
+  var seen = <int>[];
+  return Future.forEach([1, 2, 3, 4, 5], (n) {
+    seen.add(n);
+    return;
+  }).then((_) => Expect.listEquals([1, 2, 3, 4, 5], seen));

[Lasse Reichstein Nielsen, 2014/06/26 06:26:49]

The entire "(n) { seen.add(n); return; }" function can be replaced by just
"seen.add".

[nweiz, 2014/06/26 19:48:11]

Done.

+}
+
 Future testForEachWithException() {
   var seen = <int>[];
   return Future.forEach([1, 2, 3, 4, 5], (n) {
@@ -197,6 +205,35 @@ Future testForEachWithException() {
   });
 }
 
+Future testDoWhile() {
+  var count = 0;
+  return Future.doWhile(() {
+    count++;
+    return new Future(() => count < 10);
+  }).then((_) => Expect.equals(10, count));
+}
+
+Future testDoWhileSync() {
+  var count = 0;
+  return Future.doWhile(() {
+    count++;
+    return count < 10;
+  }).then((_) => Expect.equals(10, count));
+}
+
+Future testDoWhileWithException() {
+  var count = 0;
+  return Future.doWhile(() {
+    count++;
+    if (count == 4) throw 'correct exception'
+    return new Future(() => true);
+  }).then((_) {
+    throw 'incorrect exception';
+  }).catchError((error) {
+    Expect.equals('correct exception', error);
+  });
+}
+
 main() {
   List<Future> futures = new List<Future>();
 
@@ -213,7 +250,11 @@ main() {
   futures.add(testEagerWait());
   futures.add(testForEachEmpty());
   futures.add(testForEach());
+  futures.add(testForEachSync());
   futures.add(testForEachWithException());
+  futures.add(testDoWhile());
+  futures.add(testDoWhileSync());
+  futures.add(testDoWhileWithException());
 
   asyncStart();
   Future.wait(futures).then((List list) {