Use scheduled_test for Pub tests.

utils/tests/pub/sdk_constraint_test.dart

Index: utils/tests/pub/sdk_constraint_test.dart
diff --git a/utils/tests/pub/sdk_constraint_test.dart b/utils/tests/pub/sdk_constraint_test.dart
index 77ea8544e31459cd3da89da9044266a207cbb92b..db6c7692d6cb236b2a83c62dfe15ee9a52751da9 100644
--- a/utils/tests/pub/sdk_constraint_test.dart
+++ b/utils/tests/pub/sdk_constraint_test.dart
@@ -4,8 +4,10 @@
 
 library check_sdk_test;
 
+import '../../../pkg/scheduled_test/lib/scheduled_test.dart';
+
+import 'descriptor.dart' as d;
 import "test_pub.dart";
-import "../../../pkg/unittest/lib/unittest.dart";
 
 main() {
   initConfig();
@@ -17,20 +19,20 @@ main() {
     }
 
     integration("gives a friendly message if there are no constraints", () {
-      dir(appPath, [
-        pubspec({"name": "myapp"}),
-      ]).scheduleCreate();
+      d.dir(appPath, [
+        d.pubspec({"name": "myapp"}),
+      ]).create();
 
       schedulePub(args: [command], output: success);
     });
 
     integration("gives an error if the root package does not match", () {
-      dir(appPath, [
-        pubspec({
+      d.dir(appPath, [
+        d.pubspec({
           "name": "myapp",
           "environment": {"sdk": ">2.0.0"}
         })
-      ]).scheduleCreate();
+      ]).create();
 
       schedulePub(args: [command],
           error:
@@ -45,17 +47,17 @@ main() {
 
     integration("gives an error if some dependencies do not match", () {
       // Using a path source, but this should be true of all sources.
-      dir("foo", [
-        libPubspec("foo", "0.0.1", sdk: ">0.1.3"),
-        libDir("foo")
-      ]).scheduleCreate();
-      dir("bar", [
-        libPubspec("bar", "0.0.1", sdk: ">0.1.1"),
-        libDir("bar")
-      ]).scheduleCreate();
-
-      dir(appPath, [
-        pubspec({
+      d.dir("foo", [
+        d.libPubspec("foo", "0.0.1", sdk: ">0.1.3"),
+        d.libDir("foo")
+      ]).create();
+      d.dir("bar", [
+        d.libPubspec("bar", "0.0.1", sdk: ">0.1.1"),
+        d.libDir("bar")
+      ]).create();
+
+      d.dir(appPath, [
+        d.pubspec({
           "name": "myapp",
           "dependencies": {
             "foo": {"path": "../foo"},
@@ -63,7 +65,7 @@ main() {
           },
           "environment": {"sdk": ">2.0.0"}
         })
-      ]).scheduleCreate();
+      ]).create();
 
       schedulePub(args: [command],
           error:
@@ -79,25 +81,25 @@ main() {
 
     integration("gives an error if a transitive dependency doesn't match", () {
       // Using a path source, but this should be true of all sources.
-      dir("foo", [
-        libPubspec("foo", "0.0.1", deps: [
+      d.dir("foo", [
+        d.libPubspec("foo", "0.0.1", deps: [
           {"path": "../bar"}
         ]),
-        libDir("foo")
-      ]).scheduleCreate();
-      dir("bar", [
-        libPubspec("bar", "0.0.1", sdk: "<0.1.1"),
-        libDir("bar")
-      ]).scheduleCreate();
-
-      dir(appPath, [
-        pubspec({
+        d.libDir("foo")
+      ]).create();
+      d.dir("bar", [
+        d.libPubspec("bar", "0.0.1", sdk: "<0.1.1"),
+        d.libDir("bar")
+      ]).create();
+
+      d.dir(appPath, [
+        d.pubspec({
           "name": "myapp",
           "dependencies": {
             "foo": {"path": "../foo"}
           }
         })
-      ]).scheduleCreate();
+      ]).create();
 
       schedulePub(args: [command],
           error:
@@ -112,22 +114,22 @@ main() {
 
     integration("handles a circular dependency on the root package", () {
       // Using a path source, but this should be true of all sources.
-      dir("foo", [
-        libPubspec("foo", "0.0.1", sdk: ">3.0.0", deps: [
+      d.dir("foo", [
+        d.libPubspec("foo", "0.0.1", sdk: ">3.0.0", deps: [
           {"path": "../myapp"}
         ]),
-        libDir("foo")
-      ]).scheduleCreate();
+        d.libDir("foo")
+      ]).create();
 
-      dir(appPath, [
-        pubspec({
+      d.dir(appPath, [
+        d.pubspec({
           "name": "myapp",
           "dependencies": {
             "foo": {"path": "../foo"}
           },
           "environment": {"sdk": ">2.0.0"}
         })
-      ]).scheduleCreate();
+      ]).create();
 
       schedulePub(args: [command],
           error: