Support configuring timeouts per-test and -group.

test/backend/declarer_test.dart

Index: test/backend/declarer_test.dart
diff --git a/test/backend/declarer_test.dart b/test/backend/declarer_test.dart
index f8640aaa36cea02cd4018ac499e82b78c1e93940..f8ed99cbe619d4066b95ae48bf7faca6889806f7 100644
--- a/test/backend/declarer_test.dart
+++ b/test/backend/declarer_test.dart
@@ -6,6 +6,7 @@ import 'dart:async';
 
 import 'package:test/src/backend/declarer.dart';
 import 'package:test/src/backend/suite.dart';
+import 'package:test/src/frontend/timeout.dart';
 import 'package:test/test.dart';
 
 Declarer _declarer;
@@ -130,6 +131,38 @@ void main() {
       expect(_declarer.tests.single.name, "group description");
     });
 
+    test("a test's timeout factor is applied to the group's", () {
+      _declarer.group("group", () {
+        _declarer.test("test", () {},
+            timeout: new Timeout.factor(3));
+      }, timeout: new Timeout.factor(2));
+
+      expect(_declarer.tests, hasLength(1));
+      expect(_declarer.tests.single.metadata.timeout.scaleFactor, equals(6));
+    });
+
+    test("a test's timeout factor is applied to the group's duration", () {
+      _declarer.group("group", () {
+        _declarer.test("test", () {},
+            timeout: new Timeout.factor(2));
+      }, timeout: new Timeout(new Duration(seconds: 10)));
+
+      expect(_declarer.tests, hasLength(1));
+      expect(_declarer.tests.single.metadata.timeout.duration,
+          equals(new Duration(seconds: 20)));
+    });
+
+    test("a test's timeout duration is applied over the group's", () {
+      _declarer.group("group", () {
+        _declarer.test("test", () {},
+            timeout: new Timeout(new Duration(seconds: 15)));
+      }, timeout: new Timeout(new Duration(seconds: 10)));
+
+      expect(_declarer.tests, hasLength(1));
+      expect(_declarer.tests.single.metadata.timeout.duration,
+          equals(new Duration(seconds: 15)));
+    });
+
     group(".setUp()", () {
       test("is scoped to the group", () {
         var setUpRun = false;