namespace-concat in fbcode/quic

Summary:
Concatenate adjacent namespaces + format

This is a codemod. It was automatically generated and will be landed once it is approved and tests are passing in sandcastle.
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Autodiff project: nc
Autodiff partition: fbcode.quic
Autodiff bookmark: ad.nc.fbcode.quic

Reviewed By: hanidamlaj

Differential Revision: D65365244

fbshipit-source-id: 0bbaa7684d03caf8fc8eff3439a0865940398220

quic/server/handshake/test/DefaultAppTokenValidatorTest.cpp

@@ -23,8 +23,7 @@
 using namespace fizz::server;
 using namespace testing;
 
-namespace quic {
-namespace test {
+namespace quic::test {
 
 TEST(DefaultAppTokenValidatorTest, TestValidParams) {
   QuicServerConnectionState conn(
@@ -646,5 +645,4 @@ TEST_F(AlwaysRejectPolicyTest, MaxNumSourceTokenAddrMatch) {
   EXPECT_TRUE(conn_.isClientAddrVerified);
 }
 
-} // namespace test
-} // namespace quic
+} // namespace quic::test