TEST_F(AsyncHostResolverTest, AsynchronousConcurrentLookup) {
  int rv1 = resolver_->Resolve(info1_, &addrlist1_, &callback1_, NULL,
                               BoundNetLog());
  int rv2 = resolver_->Resolve(info2_, &addrlist2_, &callback2_, NULL,
                               BoundNetLog());
  EXPECT_EQ(ERR_IO_PENDING, rv1);
  EXPECT_EQ(ERR_IO_PENDING, rv2);

  rv1 = callback1_.WaitForResult();
  EXPECT_EQ(OK, rv2);
  std::vector<const char*>
    ip_addresses1(kT1IpAddresses, kT1IpAddresses + arraysize(kT1IpAddresses));
  VerifyAddressList(ip_addresses1, kPortNum, addrlist1_);

  rv2 = callback2_.WaitForResult();
  EXPECT_EQ(OK, rv2);
  std::vector<const char*>
    ip_addresses(kT2IpAddresses, kT2IpAddresses + arraysize(kT2IpAddresses));
  VerifyAddressList(ip_addresses2, kPortNum, addrlist2_);
}