Make sure pub build/serve get at the right time:

sdk/lib/_internal/pub/test/serve/gets_first_if_transitive_dependency_is_not_installed_test.dart

Index: sdk/lib/_internal/pub/test/serve/gets_first_if_transitive_dependency_is_not_installed_test.dart
diff --git a/sdk/lib/_internal/pub/test/serve/gets_first_if_transitive_dependency_is_not_installed_test.dart b/sdk/lib/_internal/pub/test/serve/gets_first_if_transitive_dependency_is_not_installed_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..963eb092338fbd32f555debc18340e6ef5738edb
--- /dev/null
+++ b/sdk/lib/_internal/pub/test/serve/gets_first_if_transitive_dependency_is_not_installed_test.dart
@@ -0,0 +1,41 @@
+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS d.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 pub_tests;
+
+import 'package:path/path.dart' as path;
+import 'package:scheduled_test/scheduled_test.dart';
+
+import '../../lib/src/io.dart';
+import '../descriptor.dart' as d;
+import '../test_pub.dart';
+import 'utils.dart';
+
+main() {
+  initConfig();
+  integration("gets first if a transitive dependency is not installed", () {
+    servePackages([packageMap("bar", "1.2.3")]);
+
+    d.dir("foo", [
+      d.libPubspec("foo", "1.0.0", deps: {
+        "bar": "any"
+      }),
+      d.libDir("foo")
+    ]).create();
+
+    d.appDir({
+      "foo": {"path": "../foo"}
+    }).create();
+
+    // Run pub to install everything.
+    pubGet();
+
+    // Delete the system cache so bar isn't installed any more.
+    schedule(() => deleteEntry(path.join(sandboxDir, cachePath)));
+
+    pubServe(shouldGetFirst: true, numDownloads: 1);
+    requestShouldSucceed("packages/bar/bar.dart", 'main() => "bar 1.2.3";');
+    endPubServe();
+  });
+}