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Unified Diff: tests/lib/async/stream_empty_test.dart

Issue 1177343004: Add Stream.empty. (Closed) Base URL: https://github.com/dart-lang/sdk.git@master
Patch Set: Remove the null future "optimization". Fix some missing type parameters. Created 5 years, 6 months ago
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Index: tests/lib/async/stream_empty_test.dart
diff --git a/tests/lib/async/stream_empty_test.dart b/tests/lib/async/stream_empty_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..133ea48b25ed6d99eb663936d1cb35d5257446fa
--- /dev/null
+++ b/tests/lib/async/stream_empty_test.dart
@@ -0,0 +1,58 @@
+// Copyright (c) 2015, 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.
+
+// Test empty stream.
+import "package:expect/expect.dart";
+import "dart:async";
+import 'package:async_helper/async_helper.dart';
+
+main() async {
+ unreachable([a,b]) { throw "UNREACHABLE"; }
+ int tick = 0;
+ ticker() { tick++; }
+
+ asyncStart();
+
+ Stream<int> s = const Stream<int>.empty(); // Is const constructor.
+ Expect.isFalse(s is Stream<String>); // Respects type parameter.
+ StreamSubscription<int> sub =
+ s.listen(unreachable, onError: unreachable, onDone: ticker);
+ Expect.isFalse(sub is StreamSubscription<String>); // Type parameter in sub.
+
+ // Doesn't do callback in response to listen.
+ Expect.equals(tick, 0);
+ await flushMicrotasks();
+ // Completes eventually.
+ Expect.equals(tick, 1);
+
+ // It's a broadcast stream - can listen twice.
+ Expect.isTrue(s.isBroadcast);
+ StreamSubscription<int> sub2 =
+ s.listen(unreachable, onError: unreachable, onDone: unreachable);
+ // respects pause.
+ sub2.pause();
+ await flushMicrotasks();
+ // respects cancel.
+ sub2.cancel();
+ await flushMicrotasks();
+ Expect.equals(tick, 1);
+ // Still not complete.
+
+ StreamSubscription<int> sub3 =
+ s.listen(unreachable, onError: unreachable, onDone: ticker);
+ // respects pause.
+ sub3.pause();
+ Expect.equals(tick, 1);
+ await flushMicrotasks();
+ // Doesn't complete while paused.
+ Expect.equals(tick, 1);
+ sub3.resume();
+ await flushMicrotasks();
+ // Now completed.
+ Expect.equals(tick, 2);
+
+ asyncEnd();
+}
+
+Future flushMicrotasks() => new Future.delayed(Duration.ZERO);
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