Properly handle web socket requests to half-initialized servers.

sdk/lib/_internal/pub/test/serve/web_socket/serve_directory_and_immediately_serve_again_test.dart

Index: sdk/lib/_internal/pub/test/serve/web_socket/serve_directory_and_immediately_serve_again_test.dart
diff --git a/sdk/lib/_internal/pub/test/serve/web_socket/serve_directory_test.dart b/sdk/lib/_internal/pub/test/serve/web_socket/serve_directory_and_immediately_serve_again_test.dart
similarity index 51%
copy from sdk/lib/_internal/pub/test/serve/web_socket/serve_directory_test.dart
copy to sdk/lib/_internal/pub/test/serve/web_socket/serve_directory_and_immediately_serve_again_test.dart
index a3de26affa8fb1b21fe32cf613b26e547aad7f27..dc7f3e326c58f2d487ee23d316874a0e7ecdd4e5 100644
--- a/sdk/lib/_internal/pub/test/serve/web_socket/serve_directory_test.dart
+++ b/sdk/lib/_internal/pub/test/serve/web_socket/serve_directory_and_immediately_serve_again_test.dart
@@ -4,6 +4,8 @@
 
 library pub_tests;
 
+import 'dart:async';
+
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../../descriptor.dart' as d;
@@ -12,7 +14,8 @@ import '../utils.dart';
 
 main() {
   initConfig();
-  integration("binds a directory to a new port", () {
+  integration("binds a directory to a new port and immediately binds that "
+      "directory again", () {
     d.dir(appPath, [
       d.appPubspec(),
       d.dir("test", [
@@ -25,27 +28,17 @@ main() {
 
     pubServe(args: ["web"]);
 
-    // Bind the new directory.
-    expectWebSocketResult("serveDirectory", {"path": "test"}, {
-      "url": matches(r"http://127\.0\.0\.1:\d+")
-    }).then((response) {
-      var url = Uri.parse(response["url"]);
-      registerServerPort("test", url.port);
+    schedule(() {
+      return Future.wait([
+        webSocketRequest("serveDirectory", {"path": "test"}),
+        webSocketRequest("serveDirectory", {"path": "test"})
+      ]).then((results) {
+        expect(results[0], contains("result"));
+        expect(results[1], contains("result"));
+        expect(results[0]["result"], equals(results[1]["result"]));
+      });
     });
 
-    // It should be served now.
-    requestShouldSucceed("index.html", "<test body>", root: "test");
-
-    // And watched.
-    d.dir(appPath, [
-      d.dir("test", [
-        d.file("index.html", "after")
-      ])
-    ]).create();
-
-    waitForBuildSuccess();
-    requestShouldSucceed("index.html", "after", root: "test");
-
     endPubServe();
   });
 }