HostResolverImpl will return ERR_NAME_NOT_RESOLVED instead of Ok if address list is empty

net/dns/host_resolver_impl_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/dns/host_resolver_impl.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/bind.h"
@@ skipping 513 matching lines @@
 
   Request* req = CreateRequest("just.testing", 80);
   EXPECT_EQ(ERR_IO_PENDING, req->Resolve());
   EXPECT_EQ(OK, req->WaitForResult());
 
   EXPECT_TRUE(req->HasOneAddress("192.168.1.42", 80));
 
   EXPECT_EQ("just.testing", proc_->GetCaptureList()[0].hostname);
 }
 
+TEST_F(HostResolverImplTest, EmptyListMeansNameNotResolved) {
+  proc_->AddRuleForAllFamilies("just.testing", "");
+  proc_->SignalMultiple(1u);
+
+  Request* req = CreateRequest("just.testing", 80);
+  EXPECT_EQ(ERR_IO_PENDING, req->Resolve());
+  EXPECT_EQ(ERR_NAME_NOT_RESOLVED, req->WaitForResult());
+  EXPECT_EQ(0u, req->NumberOfAddresses());
+  EXPECT_EQ("just.testing", proc_->GetCaptureList()[0].hostname);
+}
+
 TEST_F(HostResolverImplTest, FailedAsynchronousLookup) {
   proc_->AddRuleForAllFamilies(std::string(),
                                "0.0.0.0");  // Default to failures.
   proc_->SignalMultiple(1u);
 
   Request* req = CreateRequest("just.testing", 80);
   EXPECT_EQ(ERR_IO_PENDING, req->Resolve());
   EXPECT_EQ(ERR_NAME_NOT_RESOLVED, req->WaitForResult());
 
   EXPECT_EQ("just.testing", proc_->GetCaptureList()[0].hostname);
@@ skipping 1000 matching lines @@
   ChangeDnsConfig(config);
   req = CreateRequest(info);
   // Expect synchronous resolution from DnsHosts.
   EXPECT_EQ(OK, req->Resolve());
 
   EXPECT_EQ(saw_ipv4, req->HasAddress("127.0.0.1", 80));
   EXPECT_EQ(saw_ipv6, req->HasAddress("::1", 80));
 }
 
 }  // namespace net