// 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/third_party/quiche/src/quic/core/quic_versions.h"

#include "net/third_party/quiche/src/quic/platform/api/quic_expect_bug.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_flags.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_logging.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_mock_log.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_test.h"
#include "net/third_party/quiche/src/common/platform/api/quiche_arraysize.h"

namespace quic {
namespace test {
namespace {

using ::testing::_;
using ::testing::ElementsAre;
using ::testing::IsEmpty;

class QuicVersionsTest : public QuicTest {
 protected:
  QuicVersionLabel MakeVersionLabel(char a, char b, char c, char d) {
    return MakeQuicTag(d, c, b, a);
  }
};

TEST_F(QuicVersionsTest, QuicVersionToQuicVersionLabel) {
  // If you add a new version to the QuicTransportVersion enum you will need to
  // add a new case to QuicVersionToQuicVersionLabel, otherwise this test will
  // fail.

  // Any logs would indicate an unsupported version which we don't expect.
  CREATE_QUIC_MOCK_LOG(log);
  EXPECT_QUIC_LOG_CALL(log).Times(0);
  log.StartCapturingLogs();

  // Explicitly test a specific version.
  EXPECT_EQ(MakeQuicTag('3', '4', '0', 'Q'),
            QuicVersionToQuicVersionLabel(QUIC_VERSION_43));

  // Loop over all supported versions and make sure that we never hit the
  // default case (i.e. all supported versions should be successfully converted
  // to valid QuicVersionLabels).
  for (QuicTransportVersion transport_version : SupportedTransportVersions()) {
    if (!ParsedQuicVersionIsValid(PROTOCOL_QUIC_CRYPTO, transport_version)) {
      continue;
    }
    EXPECT_LT(0u, QuicVersionToQuicVersionLabel(transport_version));
  }
}

TEST_F(QuicVersionsTest, QuicVersionToQuicVersionLabelUnsupported) {
  EXPECT_QUIC_BUG(
      CreateQuicVersionLabel(UnsupportedQuicVersion()),
      "Unsupported version QUIC_VERSION_UNSUPPORTED PROTOCOL_UNSUPPORTED");
}

TEST_F(QuicVersionsTest, KnownAndValid) {
  for (const ParsedQuicVersion& version : AllSupportedVersions()) {
    EXPECT_TRUE(version.IsKnown());
    EXPECT_TRUE(ParsedQuicVersionIsValid(version.handshake_protocol,
                                         version.transport_version));
  }
  ParsedQuicVersion unsupported = UnsupportedQuicVersion();
  EXPECT_FALSE(unsupported.IsKnown());
  EXPECT_TRUE(ParsedQuicVersionIsValid(unsupported.handshake_protocol,
                                       unsupported.transport_version));
  ParsedQuicVersion reserved = QuicVersionReservedForNegotiation();
  EXPECT_TRUE(reserved.IsKnown());
  EXPECT_TRUE(ParsedQuicVersionIsValid(reserved.handshake_protocol,
                                       reserved.transport_version));
  // Check that invalid combinations are not valid.
  EXPECT_FALSE(ParsedQuicVersionIsValid(PROTOCOL_TLS1_3, QUIC_VERSION_43));
  EXPECT_FALSE(ParsedQuicVersionIsValid(PROTOCOL_QUIC_CRYPTO,
                                        QUIC_VERSION_IETF_DRAFT_27));
  // Check that deprecated versions are not valid.
  EXPECT_FALSE(ParsedQuicVersionIsValid(PROTOCOL_QUIC_CRYPTO,
                                        static_cast<QuicTransportVersion>(33)));
  EXPECT_FALSE(ParsedQuicVersionIsValid(PROTOCOL_QUIC_CRYPTO,
                                        static_cast<QuicTransportVersion>(99)));
  EXPECT_FALSE(ParsedQuicVersionIsValid(PROTOCOL_TLS1_3,
                                        static_cast<QuicTransportVersion>(99)));
}

TEST_F(QuicVersionsTest, Features) {
  ParsedQuicVersion parsed_version_q043 = ParsedQuicVersion::Q043();
  ParsedQuicVersion parsed_version_draft_27 = ParsedQuicVersion::Draft27();

  EXPECT_TRUE(parsed_version_q043.IsKnown());
  EXPECT_FALSE(parsed_version_q043.KnowsWhichDecrypterToUse());
  EXPECT_FALSE(parsed_version_q043.UsesInitialObfuscators());
  EXPECT_FALSE(parsed_version_q043.AllowsLowFlowControlLimits());
  EXPECT_FALSE(parsed_version_q043.HasHeaderProtection());
  EXPECT_FALSE(parsed_version_q043.SupportsRetry());
  EXPECT_FALSE(parsed_version_q043.HasRetryIntegrityTag());
  EXPECT_FALSE(
      parsed_version_q043.SendsVariableLengthPacketNumberInLongHeader());
  EXPECT_FALSE(parsed_version_q043.AllowsVariableLengthConnectionIds());
  EXPECT_FALSE(parsed_version_q043.SupportsClientConnectionIds());
  EXPECT_FALSE(parsed_version_q043.HasLengthPrefixedConnectionIds());
  EXPECT_FALSE(parsed_version_q043.SupportsAntiAmplificationLimit());
  EXPECT_FALSE(parsed_version_q043.CanSendCoalescedPackets());
  EXPECT_TRUE(parsed_version_q043.SupportsGoogleAltSvcFormat());
  EXPECT_FALSE(parsed_version_q043.HasIetfInvariantHeader());
  EXPECT_FALSE(parsed_version_q043.SupportsMessageFrames());
  EXPECT_FALSE(parsed_version_q043.UsesHttp3());
  EXPECT_FALSE(parsed_version_q043.HasLongHeaderLengths());
  EXPECT_FALSE(parsed_version_q043.UsesCryptoFrames());
  EXPECT_FALSE(parsed_version_q043.HasIetfQuicFrames());
  EXPECT_FALSE(parsed_version_q043.HasHandshakeDone());
  EXPECT_FALSE(parsed_version_q043.HasVarIntTransportParams());
  EXPECT_FALSE(parsed_version_q043.UsesTls());
  EXPECT_TRUE(parsed_version_q043.UsesQuicCrypto());

  EXPECT_TRUE(parsed_version_draft_27.IsKnown());
  EXPECT_TRUE(parsed_version_draft_27.KnowsWhichDecrypterToUse());
  EXPECT_TRUE(parsed_version_draft_27.UsesInitialObfuscators());
  EXPECT_TRUE(parsed_version_draft_27.AllowsLowFlowControlLimits());
  EXPECT_TRUE(parsed_version_draft_27.HasHeaderProtection());
  EXPECT_TRUE(parsed_version_draft_27.SupportsRetry());
  EXPECT_TRUE(parsed_version_draft_27.HasRetryIntegrityTag());
  EXPECT_TRUE(
      parsed_version_draft_27.SendsVariableLengthPacketNumberInLongHeader());
  EXPECT_TRUE(parsed_version_draft_27.AllowsVariableLengthConnectionIds());
  EXPECT_TRUE(parsed_version_draft_27.SupportsClientConnectionIds());
  EXPECT_TRUE(parsed_version_draft_27.HasLengthPrefixedConnectionIds());
  EXPECT_TRUE(parsed_version_draft_27.SupportsAntiAmplificationLimit());
  EXPECT_TRUE(parsed_version_draft_27.CanSendCoalescedPackets());
  EXPECT_FALSE(parsed_version_draft_27.SupportsGoogleAltSvcFormat());
  EXPECT_TRUE(parsed_version_draft_27.HasIetfInvariantHeader());
  EXPECT_TRUE(parsed_version_draft_27.SupportsMessageFrames());
  EXPECT_TRUE(parsed_version_draft_27.UsesHttp3());
  EXPECT_TRUE(parsed_version_draft_27.HasLongHeaderLengths());
  EXPECT_TRUE(parsed_version_draft_27.UsesCryptoFrames());
  EXPECT_TRUE(parsed_version_draft_27.HasIetfQuicFrames());
  EXPECT_TRUE(parsed_version_draft_27.HasHandshakeDone());
  EXPECT_TRUE(parsed_version_draft_27.HasVarIntTransportParams());
  EXPECT_TRUE(parsed_version_draft_27.UsesTls());
  EXPECT_FALSE(parsed_version_draft_27.UsesQuicCrypto());
}

TEST_F(QuicVersionsTest, QuicVersionLabelToQuicTransportVersion) {
  // If you add a new version to the QuicTransportVersion enum you will need to
  // add a new case to QuicVersionLabelToQuicTransportVersion, otherwise this
  // test will fail.

  // Any logs would indicate an unsupported version which we don't expect.
  CREATE_QUIC_MOCK_LOG(log);
  EXPECT_QUIC_LOG_CALL(log).Times(0);
  log.StartCapturingLogs();

  // Explicitly test specific versions.
  EXPECT_EQ(QUIC_VERSION_43,
            QuicVersionLabelToQuicVersion(MakeQuicTag('3', '4', '0', 'Q')));

  for (QuicTransportVersion transport_version : SupportedTransportVersions()) {
    if (!ParsedQuicVersionIsValid(PROTOCOL_QUIC_CRYPTO, transport_version)) {
      continue;
    }

    // Get the label from the version (we can loop over QuicVersions easily).
    QuicVersionLabel version_label =
        QuicVersionToQuicVersionLabel(transport_version);
    EXPECT_LT(0u, version_label);

    // Now try converting back.
    QuicTransportVersion label_to_transport_version =
        QuicVersionLabelToQuicVersion(version_label);
    EXPECT_EQ(transport_version, label_to_transport_version);
    EXPECT_NE(QUIC_VERSION_UNSUPPORTED, label_to_transport_version);
  }
}

TEST_F(QuicVersionsTest, QuicVersionLabelToQuicVersionUnsupported) {
  CREATE_QUIC_MOCK_LOG(log);
  if (QUIC_DLOG_INFO_IS_ON()) {
    EXPECT_QUIC_LOG_CALL_CONTAINS(log, INFO,
                                  "Unsupported QuicVersionLabel version: EKAF")
        .Times(1);
  }
  log.StartCapturingLogs();

  EXPECT_EQ(QUIC_VERSION_UNSUPPORTED,
            QuicVersionLabelToQuicVersion(MakeQuicTag('F', 'A', 'K', 'E')));
}

TEST_F(QuicVersionsTest, QuicVersionLabelToHandshakeProtocol) {
  CREATE_QUIC_MOCK_LOG(log);
  EXPECT_QUIC_LOG_CALL(log).Times(0);
  log.StartCapturingLogs();

  for (const ParsedQuicVersion& version : AllSupportedVersions()) {
    if (version.handshake_protocol != PROTOCOL_QUIC_CRYPTO) {
      continue;
    }
    QuicVersionLabel version_label =
        QuicVersionToQuicVersionLabel(version.transport_version);
    EXPECT_EQ(PROTOCOL_QUIC_CRYPTO,
              QuicVersionLabelToHandshakeProtocol(version_label));
  }

  // Test a TLS version:
  QuicTag tls_tag = MakeQuicTag('0', '5', '0', 'T');
  EXPECT_EQ(PROTOCOL_TLS1_3, QuicVersionLabelToHandshakeProtocol(tls_tag));
}

TEST_F(QuicVersionsTest, ParseQuicVersionLabel) {
  EXPECT_EQ(ParsedQuicVersion::Q043(),
            ParseQuicVersionLabel(MakeVersionLabel('Q', '0', '4', '3')));
  EXPECT_EQ(ParsedQuicVersion::Q046(),
            ParseQuicVersionLabel(MakeVersionLabel('Q', '0', '4', '6')));
  EXPECT_EQ(ParsedQuicVersion::Q050(),
            ParseQuicVersionLabel(MakeVersionLabel('Q', '0', '5', '0')));
  EXPECT_EQ(ParsedQuicVersion::T050(),
            ParseQuicVersionLabel(MakeVersionLabel('T', '0', '5', '0')));
}

TEST_F(QuicVersionsTest, ParseQuicVersionString) {
  EXPECT_EQ(ParsedQuicVersion::Q043(), ParseQuicVersionString("Q043"));
  EXPECT_EQ(ParsedQuicVersion::Q046(),
            ParseQuicVersionString("QUIC_VERSION_46"));
  EXPECT_EQ(ParsedQuicVersion::Q046(), ParseQuicVersionString("46"));
  EXPECT_EQ(ParsedQuicVersion::Q046(), ParseQuicVersionString("Q046"));
  EXPECT_EQ(ParsedQuicVersion::Q050(), ParseQuicVersionString("Q050"));
  EXPECT_EQ(ParsedQuicVersion::Q050(), ParseQuicVersionString("50"));
  EXPECT_EQ(ParsedQuicVersion::Q050(), ParseQuicVersionString("h3-Q050"));

  EXPECT_EQ(UnsupportedQuicVersion(), ParseQuicVersionString(""));
  EXPECT_EQ(UnsupportedQuicVersion(), ParseQuicVersionString("Q 46"));
  EXPECT_EQ(UnsupportedQuicVersion(), ParseQuicVersionString("Q046 "));
  EXPECT_EQ(UnsupportedQuicVersion(), ParseQuicVersionString("99"));
  EXPECT_EQ(UnsupportedQuicVersion(), ParseQuicVersionString("70"));

  EXPECT_EQ(ParsedQuicVersion::T050(), ParseQuicVersionString("T050"));
  EXPECT_EQ(ParsedQuicVersion::T050(), ParseQuicVersionString("h3-T050"));
  EXPECT_EQ(ParsedQuicVersion::Draft29(), ParseQuicVersionString("ff00001d"));
  EXPECT_EQ(ParsedQuicVersion::Draft29(), ParseQuicVersionString("draft29"));
  EXPECT_EQ(ParsedQuicVersion::Draft29(), ParseQuicVersionString("h3-29"));
  EXPECT_EQ(ParsedQuicVersion::Draft27(), ParseQuicVersionString("ff00001b"));
  EXPECT_EQ(ParsedQuicVersion::Draft27(), ParseQuicVersionString("draft27"));
  EXPECT_EQ(ParsedQuicVersion::Draft27(), ParseQuicVersionString("h3-27"));

  for (const ParsedQuicVersion& version : AllSupportedVersions()) {
    EXPECT_EQ(version,
              ParseQuicVersionString(ParsedQuicVersionToString(version)));
  }
}

TEST_F(QuicVersionsTest, ParseQuicVersionVectorString) {
  ParsedQuicVersion version_q046(PROTOCOL_QUIC_CRYPTO, QUIC_VERSION_46);
  ParsedQuicVersion version_q050(PROTOCOL_QUIC_CRYPTO, QUIC_VERSION_50);
  ParsedQuicVersion version_t050(PROTOCOL_TLS1_3, QUIC_VERSION_50);
  ParsedQuicVersion version_draft_27(PROTOCOL_TLS1_3,
                                     QUIC_VERSION_IETF_DRAFT_27);
  ParsedQuicVersion version_draft_29 = ParsedQuicVersion::Draft29();

  EXPECT_THAT(ParseQuicVersionVectorString(""), IsEmpty());

  EXPECT_THAT(ParseQuicVersionVectorString("QUIC_VERSION_50"),
              ElementsAre(version_q050));
  EXPECT_THAT(ParseQuicVersionVectorString("h3-Q050"),
              ElementsAre(version_q050));
  EXPECT_THAT(ParseQuicVersionVectorString("h3-T050"),
              ElementsAre(version_t050));

  EXPECT_THAT(ParseQuicVersionVectorString("h3-27, h3-29"),
              ElementsAre(version_draft_27, version_draft_29));
  EXPECT_THAT(ParseQuicVersionVectorString("h3-29,h3-27,h3-29"),
              ElementsAre(version_draft_29, version_draft_27));
  EXPECT_THAT(ParseQuicVersionVectorString("h3-29,h3-27, h3-29"),
              ElementsAre(version_draft_29, version_draft_27));
  EXPECT_THAT(ParseQuicVersionVectorString("h3-27,h3-29"),
              ElementsAre(version_draft_27, version_draft_29));
  EXPECT_THAT(ParseQuicVersionVectorString("h3-29,h3-27"),
              ElementsAre(version_draft_29, version_draft_27));

  EXPECT_THAT(ParseQuicVersionVectorString("h3-27,50"),
              ElementsAre(version_draft_27, version_q050));

  EXPECT_THAT(ParseQuicVersionVectorString("h3-Q050, h3-T050"),
              ElementsAre(version_q050, version_t050));
  EXPECT_THAT(ParseQuicVersionVectorString("h3-T050, h3-Q050"),
              ElementsAre(version_t050, version_q050));
  EXPECT_THAT(ParseQuicVersionVectorString("QUIC_VERSION_50,h3-T050"),
              ElementsAre(version_q050, version_t050));
  EXPECT_THAT(ParseQuicVersionVectorString("h3-T050,QUIC_VERSION_50"),
              ElementsAre(version_t050, version_q050));
  EXPECT_THAT(ParseQuicVersionVectorString("QUIC_VERSION_50, h3-T050"),
              ElementsAre(version_q050, version_t050));
  EXPECT_THAT(ParseQuicVersionVectorString("h3-T050, QUIC_VERSION_50"),
              ElementsAre(version_t050, version_q050));

  EXPECT_THAT(ParseQuicVersionVectorString("QUIC_VERSION_50,QUIC_VERSION_46"),
              ElementsAre(version_q050, version_q046));
  EXPECT_THAT(ParseQuicVersionVectorString("QUIC_VERSION_46,QUIC_VERSION_50"),
              ElementsAre(version_q046, version_q050));

  // Regression test for https://crbug.com/1044952.
  EXPECT_THAT(ParseQuicVersionVectorString("QUIC_VERSION_50, QUIC_VERSION_50"),
              ElementsAre(version_q050));
  EXPECT_THAT(ParseQuicVersionVectorString("h3-Q050, h3-Q050"),
              ElementsAre(version_q050));
  EXPECT_THAT(ParseQuicVersionVectorString("h3-T050, h3-T050"),
              ElementsAre(version_t050));
  EXPECT_THAT(ParseQuicVersionVectorString("h3-Q050, QUIC_VERSION_50"),
              ElementsAre(version_q050));
  EXPECT_THAT(ParseQuicVersionVectorString(
                  "QUIC_VERSION_50, h3-Q050, QUIC_VERSION_50, h3-Q050"),
              ElementsAre(version_q050));
  EXPECT_THAT(ParseQuicVersionVectorString("QUIC_VERSION_50, h3-T050, h3-Q050"),
              ElementsAre(version_q050, version_t050));

  EXPECT_THAT(ParseQuicVersionVectorString("99"), IsEmpty());
  EXPECT_THAT(ParseQuicVersionVectorString("70"), IsEmpty());
  EXPECT_THAT(ParseQuicVersionVectorString("h3-01"), IsEmpty());
  EXPECT_THAT(ParseQuicVersionVectorString("h3-01,h3-29"),
              ElementsAre(version_draft_29));
}

TEST_F(QuicVersionsTest, CreateQuicVersionLabel) {
  EXPECT_EQ(MakeVersionLabel('Q', '0', '4', '3'),
            CreateQuicVersionLabel(ParsedQuicVersion::Q043()));
  EXPECT_EQ(MakeVersionLabel('Q', '0', '4', '6'),
            CreateQuicVersionLabel(ParsedQuicVersion::Q046()));
  EXPECT_EQ(MakeVersionLabel('Q', '0', '5', '0'),
            CreateQuicVersionLabel(ParsedQuicVersion::Q050()));

  // Test a TLS version:
  EXPECT_EQ(MakeVersionLabel('T', '0', '5', '0'),
            CreateQuicVersionLabel(ParsedQuicVersion::T050()));

  // Make sure the negotiation reserved version is in the IETF reserved space.
  EXPECT_EQ(MakeVersionLabel(0xda, 0x5a, 0x3a, 0x3a) & 0x0f0f0f0f,
            CreateQuicVersionLabel(ParsedQuicVersion(
                PROTOCOL_QUIC_CRYPTO, QUIC_VERSION_RESERVED_FOR_NEGOTIATION)) &
                0x0f0f0f0f);

  // Make sure that disabling randomness works.
  SetQuicFlag(FLAGS_quic_disable_version_negotiation_grease_randomness, true);
  EXPECT_EQ(MakeVersionLabel(0xda, 0x5a, 0x3a, 0x3a),
            CreateQuicVersionLabel(ParsedQuicVersion(
                PROTOCOL_QUIC_CRYPTO, QUIC_VERSION_RESERVED_FOR_NEGOTIATION)));
}

TEST_F(QuicVersionsTest, QuicVersionLabelToString) {
  QuicVersionLabelVector version_labels = {
      MakeVersionLabel('Q', '0', '3', '5'),
      MakeVersionLabel('Q', '0', '3', '7'),
      MakeVersionLabel('T', '0', '3', '8'),
  };

  EXPECT_EQ("Q035", QuicVersionLabelToString(version_labels[0]));
  EXPECT_EQ("T038", QuicVersionLabelToString(version_labels[2]));

  EXPECT_EQ("Q035,Q037,T038", QuicVersionLabelVectorToString(version_labels));
  EXPECT_EQ("Q035:Q037:T038",
            QuicVersionLabelVectorToString(version_labels, ":", 2));
  EXPECT_EQ("Q035|Q037|...",
            QuicVersionLabelVectorToString(version_labels, "|", 1));

  std::ostringstream os;
  os << version_labels;
  EXPECT_EQ("Q035,Q037,T038", os.str());
}

TEST_F(QuicVersionsTest, QuicVersionToString) {
  EXPECT_EQ("QUIC_VERSION_UNSUPPORTED",
            QuicVersionToString(QUIC_VERSION_UNSUPPORTED));

  QuicTransportVersion single_version[] = {QUIC_VERSION_43};
  QuicTransportVersionVector versions_vector;
  for (size_t i = 0; i < QUICHE_ARRAYSIZE(single_version); ++i) {
    versions_vector.push_back(single_version[i]);
  }
  EXPECT_EQ("QUIC_VERSION_43",
            QuicTransportVersionVectorToString(versions_vector));

  QuicTransportVersion multiple_versions[] = {QUIC_VERSION_UNSUPPORTED,
                                              QUIC_VERSION_43};
  versions_vector.clear();
  for (size_t i = 0; i < QUICHE_ARRAYSIZE(multiple_versions); ++i) {
    versions_vector.push_back(multiple_versions[i]);
  }
  EXPECT_EQ("QUIC_VERSION_UNSUPPORTED,QUIC_VERSION_43",
            QuicTransportVersionVectorToString(versions_vector));

  // Make sure that all supported versions are present in QuicVersionToString.
  for (QuicTransportVersion transport_version : SupportedTransportVersions()) {
    EXPECT_NE("QUIC_VERSION_UNSUPPORTED",
              QuicVersionToString(transport_version));
  }

  std::ostringstream os;
  os << versions_vector;
  EXPECT_EQ("QUIC_VERSION_UNSUPPORTED,QUIC_VERSION_43", os.str());
}

TEST_F(QuicVersionsTest, ParsedQuicVersionToString) {
  EXPECT_EQ("0", ParsedQuicVersionToString(ParsedQuicVersion::Unsupported()));
  EXPECT_EQ("Q043", ParsedQuicVersionToString(ParsedQuicVersion::Q043()));
  EXPECT_EQ("Q046", ParsedQuicVersionToString(ParsedQuicVersion::Q046()));
  EXPECT_EQ("Q050", ParsedQuicVersionToString(ParsedQuicVersion::Q050()));
  EXPECT_EQ("T050", ParsedQuicVersionToString(ParsedQuicVersion::T050()));
  EXPECT_EQ("draft27", ParsedQuicVersionToString(ParsedQuicVersion::Draft27()));
  EXPECT_EQ("draft29", ParsedQuicVersionToString(ParsedQuicVersion::Draft29()));

  ParsedQuicVersionVector versions_vector = {ParsedQuicVersion::Q043()};
  EXPECT_EQ("Q043", ParsedQuicVersionVectorToString(versions_vector));

  versions_vector = {ParsedQuicVersion::Unsupported(),
                     ParsedQuicVersion::Q043()};
  EXPECT_EQ("0,Q043", ParsedQuicVersionVectorToString(versions_vector));
  EXPECT_EQ("0:Q043", ParsedQuicVersionVectorToString(versions_vector, ":",
                                                      versions_vector.size()));
  EXPECT_EQ("0|...", ParsedQuicVersionVectorToString(versions_vector, "|", 0));

  // Make sure that all supported versions are present in
  // ParsedQuicVersionToString.
  for (const ParsedQuicVersion& version : AllSupportedVersions()) {
    EXPECT_NE("0", ParsedQuicVersionToString(version));
  }

  std::ostringstream os;
  os << versions_vector;
  EXPECT_EQ("0,Q043", os.str());
}

TEST_F(QuicVersionsTest, FilterSupportedVersionsAllVersions) {
  for (const ParsedQuicVersion& version : AllSupportedVersions()) {
    QuicEnableVersion(version);
  }
  ParsedQuicVersionVector expected_parsed_versions;
  for (const ParsedQuicVersion& version : SupportedVersions()) {
    expected_parsed_versions.push_back(version);
  }
  EXPECT_EQ(expected_parsed_versions,
            FilterSupportedVersions(AllSupportedVersions()));
  EXPECT_EQ(expected_parsed_versions, AllSupportedVersions());
}

TEST_F(QuicVersionsTest, FilterSupportedVersionsWithoutFirstVersion) {
  for (const ParsedQuicVersion& version : AllSupportedVersions()) {
    QuicEnableVersion(version);
  }
  QuicDisableVersion(AllSupportedVersions().front());
  ParsedQuicVersionVector expected_parsed_versions;
  for (const ParsedQuicVersion& version : SupportedVersions()) {
    expected_parsed_versions.push_back(version);
  }
  expected_parsed_versions.erase(expected_parsed_versions.begin());
  EXPECT_EQ(expected_parsed_versions,
            FilterSupportedVersions(AllSupportedVersions()));
}

TEST_F(QuicVersionsTest, LookUpVersionByIndex) {
  QuicTransportVersionVector all_versions = {QUIC_VERSION_43};
  int version_count = all_versions.size();
  for (int i = -5; i <= version_count + 1; ++i) {
    QuicTransportVersionVector index = VersionOfIndex(all_versions, i);
    if (i >= 0 && i < version_count) {
      EXPECT_EQ(all_versions[i], index[0]);
    } else {
      EXPECT_EQ(QUIC_VERSION_UNSUPPORTED, index[0]);
    }
  }
}

TEST_F(QuicVersionsTest, LookUpParsedVersionByIndex) {
  ParsedQuicVersionVector all_versions = AllSupportedVersions();
  int version_count = all_versions.size();
  for (int i = -5; i <= version_count + 1; ++i) {
    ParsedQuicVersionVector index = ParsedVersionOfIndex(all_versions, i);
    if (i >= 0 && i < version_count) {
      EXPECT_EQ(all_versions[i], index[0]);
    } else {
      EXPECT_EQ(UnsupportedQuicVersion(), index[0]);
    }
  }
}

TEST_F(QuicVersionsTest, ParsedVersionsToTransportVersions) {
  ParsedQuicVersionVector all_versions = AllSupportedVersions();
  QuicTransportVersionVector transport_versions =
      ParsedVersionsToTransportVersions(all_versions);
  ASSERT_EQ(all_versions.size(), transport_versions.size());
  for (size_t i = 0; i < all_versions.size(); ++i) {
    EXPECT_EQ(transport_versions[i], all_versions[i].transport_version);
  }
}

// This test may appear to be so simplistic as to be unnecessary,
// yet a typo was made in doing the #defines and it was caught
// only in some test far removed from here... Better safe than sorry.
TEST_F(QuicVersionsTest, CheckTransportVersionNumbersForTypos) {
  static_assert(SupportedTransportVersions().size() == 6u,
                "Supported versions out of sync");
  EXPECT_EQ(QUIC_VERSION_43, 43);
  EXPECT_EQ(QUIC_VERSION_46, 46);
  EXPECT_EQ(QUIC_VERSION_50, 50);
  EXPECT_EQ(QUIC_VERSION_51, 51);
  EXPECT_EQ(QUIC_VERSION_IETF_DRAFT_27, 71);
  EXPECT_EQ(QUIC_VERSION_IETF_DRAFT_29, 73);
}

TEST_F(QuicVersionsTest, AlpnForVersion) {
  static_assert(SupportedVersions().size() == 7u,
                "Supported versions out of sync");
  EXPECT_EQ("h3-Q043", AlpnForVersion(ParsedQuicVersion::Q043()));
  EXPECT_EQ("h3-Q046", AlpnForVersion(ParsedQuicVersion::Q046()));
  EXPECT_EQ("h3-Q050", AlpnForVersion(ParsedQuicVersion::Q050()));
  EXPECT_EQ("h3-T050", AlpnForVersion(ParsedQuicVersion::T050()));
  EXPECT_EQ("h3-T051", AlpnForVersion(ParsedQuicVersion::T051()));
  EXPECT_EQ("h3-27", AlpnForVersion(ParsedQuicVersion::Draft27()));
  EXPECT_EQ("h3-29", AlpnForVersion(ParsedQuicVersion::Draft29()));
}

TEST_F(QuicVersionsTest, QuicVersionEnabling) {
  for (const ParsedQuicVersion& version : AllSupportedVersions()) {
    QuicFlagSaver flag_saver;
    QuicDisableVersion(version);
    EXPECT_FALSE(QuicVersionIsEnabled(version));
    QuicEnableVersion(version);
    EXPECT_TRUE(QuicVersionIsEnabled(version));
  }
}

TEST_F(QuicVersionsTest, ReservedForNegotiation) {
  EXPECT_EQ(QUIC_VERSION_RESERVED_FOR_NEGOTIATION,
            QuicVersionReservedForNegotiation().transport_version);
  // QUIC_VERSION_RESERVED_FOR_NEGOTIATION MUST NOT be added to
  // kSupportedTransportVersions.
  for (QuicTransportVersion transport_version : SupportedTransportVersions()) {
    EXPECT_NE(QUIC_VERSION_RESERVED_FOR_NEGOTIATION, transport_version);
  }
}

TEST_F(QuicVersionsTest, SupportedVersionsHasCorrectList) {
  size_t index = 0;
  for (HandshakeProtocol handshake_protocol : SupportedHandshakeProtocols()) {
    for (QuicTransportVersion transport_version :
         SupportedTransportVersions()) {
      SCOPED_TRACE(index);
      if (ParsedQuicVersionIsValid(handshake_protocol, transport_version)) {
        ParsedQuicVersion version = SupportedVersions()[index];
        EXPECT_EQ(version,
                  ParsedQuicVersion(handshake_protocol, transport_version));
        index++;
      }
    }
  }
  EXPECT_EQ(SupportedVersions().size(), index);
}

TEST_F(QuicVersionsTest, SupportedVersionsAllDistinct) {
  for (size_t index1 = 0; index1 < SupportedVersions().size(); ++index1) {
    ParsedQuicVersion version1 = SupportedVersions()[index1];
    for (size_t index2 = index1 + 1; index2 < SupportedVersions().size();
         ++index2) {
      ParsedQuicVersion version2 = SupportedVersions()[index2];
      EXPECT_NE(version1, version2) << version1 << " " << version2;
      EXPECT_NE(CreateQuicVersionLabel(version1),
                CreateQuicVersionLabel(version2))
          << version1 << " " << version2;
      EXPECT_NE(AlpnForVersion(version1), AlpnForVersion(version2))
          << version1 << " " << version2;
    }
  }
}

}  // namespace
}  // namespace test
}  // namespace quic