Dispatcher tests (tests the code in events.md)

sky/tests/events/dispatcher.sky

+<script>
+import "../resources/third_party/unittest/unittest.dart";
+import "../resources/unit.dart";
+import "dart:sky";
+import 'dart:async';
+
+void send20IntegersToDispatcherController(DispatcherController d) {
+  for (var index = 0; index < 20; index += 1)
+    d.add(index);
+}
+
+void main() {
+  initUnit();
+
+  group('Dispatcher', () {
+
+    test('simple listen', () {
+      var d = new DispatcherController();
+      var result = new List();
+      d.dispatcher.listen((v) => result.add(v));
+      send20IntegersToDispatcherController(d);
+      expect(result, orderedEquals([0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19]));
+    });
+
+    test('firstWhere', () {
+      var d = new DispatcherController();
+      var result = new List();
+      d.dispatcher.firstWhere((n) => n > 15).then((v) => result.add(v));
+      send20IntegersToDispatcherController(d);
+      new Timer(new Duration(), expectAsync(() => expect(result, orderedEquals([16]))));
+    });
+
+    test('where', () {
+      var d = new DispatcherController();
+      var result = new List();
+      d.dispatcher.where((n) => n % 2 == 0).until((n) => n > 10).listen((v) => result.add(v));
+      send20IntegersToDispatcherController(d);
+      expect(result, orderedEquals([0,2,4,6,8,10]));
+    });
+
+    test('where without listener', () {
+      var d = new DispatcherController();
+      var result = new List();
+      d.dispatcher.where((n) => result.add(n));
+      send20IntegersToDispatcherController(d);
+      expect(result, orderedEquals([]));
+    });
+
+    test('where with listeners removed', () {
+      var d = new DispatcherController();
+      var result = new List();
+      var w = d.dispatcher.where((n) { result.add(n); return true; });
+      d.add(0);
+      var f1 = (v) => result.add(100 + v);
+      w.listen(f1);
+      d.add(1);
+      var f2 = (v) => result.add(200 + v);
+      w.listen(f2);
+      d.add(2);
+      w.unlisten(f1);
+      d.add(3);
+      w.unlisten(f2);
+      d.add(4);
+      expect(result, orderedEquals([1, 101, 2, 102, 202, 3, 203]));
+    });
+
+    test('double listeners', () {
+      var d = new DispatcherController();
+      var result = new List();
+      d.dispatcher..listen((v) => result.add(v))
+                  ..where((n) => n < 3).listen((v) => result.add(v*100));
+      send20IntegersToDispatcherController(d);
+      expect(result, orderedEquals([0,0,1,100,2,200,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19]));
+    });
+
+    test('zones', () {
+      var d = new DispatcherController();
+      var result = new List();
+      runZoned(() {
+        var zoneA = Zone.current;
+        var listener;
+        listener = (v) {
+          if (Zone.current == zoneA)
+            result.add(v + 0.1);
+          if (v >= 18)
+            d.dispatcher.unlisten(listener);
+        };
+        d.dispatcher.listen(listener);
+      });
+      runZoned(() {
+        var zoneB = Zone.current;
+        d.dispatcher.until((n) => n >= 10).listen((v) {
+          if (Zone.current == zoneB)
+            result.add(v + 0.2);
+        });
+      });
+      send20IntegersToDispatcherController(d);
+      expect(result, orderedEquals([0.1,0.2,1.1,1.2,2.1,2.2,3.1,3.2,4.1,4.2,5.1,5.2,6.1,6.2,7.1,7.2,8.1,8.2,9.1,9.2,10.1,11.1,12.1,13.1,14.1,15.1,16.1,17.1,18.1]));
+    });
+
+  });
+}
+</script>