Add built-in timeouts to scheduled_test.

pkg/scheduled_test/test/substitute_future_test.dart

+// Copyright (c) 2013, 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 substitute_future_test;
+
+import 'dart:async';
+
+import 'package:scheduled_test/src/substitute_future.dart';
+import 'package:unittest/unittest.dart';
+
+void main() {
+  group('with no substitution, works like a normal Future for', () {
+    var completer;
+    var future;
+
+    setUp(() {
+      completer = new Completer();
+      future = new SubstituteFuture(completer.future);
+    });
+
+    test('.asStream on success', () {
+      expect(future.asStream().toList(), completion(equals(['success'])));
+      completer.complete('success');
+    });
+
+    test('.asStream on error', () {
+      expect(future.asStream().toList(), throwsA(equals('error')));
+      completer.completeError('error');
+    });
+
+    test('.then and .catchError on success', () {
+      expect(future.then((v) => "transformed $v")
+              .catchError((e) => "caught ${e.error}"),
+          completion(equals('transformed success')));
+      completer.complete('success');
+    });
+
+    test('.then and .catchError on error', () {
+      expect(future.then((v) => "transformed $v")
+              .catchError((e) => "caught ${e.error}"),
+          completion(equals('caught error')));
+      completer.completeError('error');
+    });
+
+    test('.then with onError on success', () {
+      expect(future.then((v) => "transformed $v",
+              onError: (e) => "caught ${e.error}"),
+          completion(equals('transformed success')));
+      completer.complete('success');
+    });
+
+    test('.then with onError on error', () {
+      expect(future.then((v) => "transformed $v",
+              onError: (e) => "caught ${e.error}"),
+          completion(equals('caught error')));
+      completer.completeError('error');
+    });
+
+    test('.whenComplete on success', () {
+      expect(future.whenComplete(() {
+        throw 'whenComplete';
+      }), throwsA(equals('whenComplete')));
+      completer.complete('success');
+    });
+
+    test('.whenComplete on error', () {
+      expect(future.whenComplete(() {
+        throw 'whenComplete';
+      }), throwsA(equals('whenComplete')));
+      completer.completeError('error');
+    });
+  });
+
+  group('with a single substitution', () {
+    var oldCompleter;
+    var oldFuture;
+    var newCompleter;
+    var future;
+
+    setUp(() {
+      oldCompleter = new Completer();
+      future = new SubstituteFuture(oldCompleter.future);
+      newCompleter = new Completer();
+      oldFuture = future.substitute(newCompleter.future);
+    });
+
+    test('pipes a success from the new future to the substitute future, and '
+        'from the old future to the return value of .substitute', () {
+      expect(oldFuture, completion(equals('old')));
+      expect(future, completion(equals('new')));
+
+      oldCompleter.complete('old');
+      newCompleter.complete('new');
+    });
+
+    test('pipes an error from the new future to the substitute future, and '
+        'from the old future to the return value of .substitute', () {
+      expect(oldFuture, throwsA(equals('old')));
+      expect(future, throwsA(equals('new')));
+
+      oldCompleter.completeError('old');
+      newCompleter.completeError('new');
+    });
+  });
+
+  group('with multiple substitutions', () {
+    var completer1;
+    var completer2;
+    var completer3;
+    var future1;
+    var future2;
+    var future;
+
+    setUp(() {
+      completer1 = new Completer();
+      completer2 = new Completer();
+      completer3 = new Completer();
+      future = new SubstituteFuture(completer1.future);
+      future1 = future.substitute(completer2.future);
+      future2 = future.substitute(completer3.future);
+    });
+
+    test('pipes a success from the newest future to the substitute future, and '
+        'from the old futures to the return values of .substitute', () {
+      expect(future1, completion(equals(1)));
+      expect(future2, completion(equals(2)));
+      expect(future, completion(equals(3)));
+
+      completer1.complete(1);
+      completer2.complete(2);
+      completer3.complete(3);
+    });
+
+    test('pipes an error from the newest future to the substitute future, and '
+        'from the old futures to the return values of .substitute', () {
+      expect(future1, throwsA(equals(1)));
+      expect(future2, throwsA(equals(2)));
+      expect(future, throwsA(equals(3)));
+
+      completer1.completeError(1);
+      completer2.completeError(2);
+      completer3.completeError(3);
+    });
+  });
+
+  test('substituting after a future has completed is an error', () {
+    var completer = new Completer();
+    var future = new SubstituteFuture(completer.future);
+    completer.complete('success');
+    expect(() => future.substitute(new Future.immediate(null)),
+        throwsStateError);
+  });
+}