clio/tests/unit/rpc/handlers/AccountLinesTests.cpp

#include "data/Types.hpp"
#include "rpc/Errors.hpp"
#include "rpc/common/AnyHandler.hpp"
#include "rpc/common/Types.hpp"
#include "rpc/handlers/AccountLines.hpp"
#include "util/HandlerBaseTestFixture.hpp"
#include "util/TestObject.hpp"

#include <boost/json/parse.hpp>
#include <boost/json/value.hpp>
#include <boost/json/value_to.hpp>
#include <fmt/format.h>
#include <gmock/gmock.h>
#include <gtest/gtest.h>
#include <xrpl/basics/base_uint.h>
#include <xrpl/protocol/Indexes.h>
#include <xrpl/protocol/LedgerFormats.h>
#include <xrpl/protocol/LedgerHeader.h>
#include <xrpl/protocol/SField.h>
#include <xrpl/protocol/STObject.h>

#include <cstdint>
#include <optional>
#include <string>
#include <vector>

using namespace rpc;
using namespace data;
namespace json = boost::json;
using namespace testing;

namespace {

constexpr auto kLedgerHash = "4BC50C9B0D8515D3EAAE1E74B29A95804346C491EE1A95BF25E4AAB854A6A652";
constexpr auto kAccount = "rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jpn";
constexpr auto kAccount2 = "rLEsXccBGNR3UPuPu2hUXPjziKC3qKSBun";
constexpr auto kAccount3 = "rB9BMzh27F3Q6a5FtGPDayQoCCEdiRdqcK";
constexpr auto kIndex1 = "E6DBAFC99223B42257915A63DFC6B0C032D4070F9A574B255AD97466726FC321";
constexpr auto kIndex2 = "E6DBAFC99223B42257915A63DFC6B0C032D4070F9A574B255AD97466726FC322";
constexpr auto kTxnId = "05FB0EB4B899F056FA095537C5817163801F544BAFCEA39C995D76DB4D16F9DD";

}  // namespace

struct RPCAccountLinesHandlerTest : HandlerBaseTest {
    RPCAccountLinesHandlerTest()
    {
        backend_->setRange(10, 30);
    }
};

// TODO: a lot of the tests are copy-pasted from AccountChannelsTest
// because the logic is mostly the same but currently implemented in
// a separate handler class. We should eventually use some sort of
// base class or common component to these `account_*` rpcs.

TEST_F(RPCAccountLinesHandlerTest, NonHexLedgerHash)
{
    runSpawn([this](auto yield) {
        auto const handler = AnyHandler{AccountLinesHandler{backend_}};
        auto const input = json::parse(
            fmt::format(
                R"JSON({{
                    "account": "{}",
                    "limit": 10,
                    "ledger_hash": "xxx"
                }})JSON",
                kAccount
            )
        );
        auto const output = handler.process(input, Context{yield});
        ASSERT_FALSE(output);

        auto const err = rpc::makeError(output.result.error());
        EXPECT_EQ(err.at("error").as_string(), "invalidParams");
        EXPECT_EQ(err.at("error_message").as_string(), "ledger_hashMalformed");
    });
}

TEST_F(RPCAccountLinesHandlerTest, NonStringLedgerHash)
{
    runSpawn([this](auto yield) {
        auto const handler = AnyHandler{AccountLinesHandler{backend_}};
        auto const input = json::parse(
            fmt::format(
                R"JSON({{
                    "account": "{}",
                    "limit": 10,
                    "ledger_hash": 123
                }})JSON",
                kAccount
            )
        );
        auto const output = handler.process(input, Context{yield});
        ASSERT_FALSE(output);

        auto const err = rpc::makeError(output.result.error());
        EXPECT_EQ(err.at("error").as_string(), "invalidParams");
        EXPECT_EQ(err.at("error_message").as_string(), "ledger_hashNotString");
    });
}

TEST_F(RPCAccountLinesHandlerTest, InvalidLedgerIndexString)
{
    runSpawn([this](auto yield) {
        auto const handler = AnyHandler{AccountLinesHandler{backend_}};
        auto const input = json::parse(
            fmt::format(
                R"JSON({{
                    "account": "{}",
                    "limit": 10,
                    "ledger_index": "notvalidated"
                }})JSON",
                kAccount
            )
        );
        auto const output = handler.process(input, Context{yield});
        ASSERT_FALSE(output);

        auto const err = rpc::makeError(output.result.error());
        EXPECT_EQ(err.at("error").as_string(), "invalidParams");
        EXPECT_EQ(err.at("error_message").as_string(), "ledgerIndexMalformed");
    });
}

TEST_F(RPCAccountLinesHandlerTest, MarkerNotString)
{
    runSpawn([this](auto yield) {
        auto const handler = AnyHandler{AccountLinesHandler{backend_}};
        auto const input = json::parse(
            fmt::format(
                R"JSON({{
                    "account": "{}",
                    "marker": 9
                }})JSON",
                kAccount
            )
        );
        auto const output = handler.process(input, Context{yield});
        ASSERT_FALSE(output);

        auto const err = rpc::makeError(output.result.error());
        EXPECT_EQ(err.at("error").as_string(), "invalidParams");
        EXPECT_EQ(err.at("error_message").as_string(), "markerNotString");
    });
}

// error case : invalid marker
// marker format is composed of a comma separated index and start hint. The
// former will be read as hex, and the latter using boost lexical cast.
TEST_F(RPCAccountLinesHandlerTest, InvalidMarker)
{
    runSpawn([this](auto yield) {
        auto const handler = AnyHandler{AccountLinesHandler{backend_}};
        auto const input = json::parse(
            fmt::format(
                R"JSON({{
                    "account": "{}",
                    "marker": "123invalid"
                }})JSON",
                kAccount
            )
        );
        auto const output = handler.process(input, Context{yield});
        ASSERT_FALSE(output);

        auto const err = rpc::makeError(output.result.error());
        EXPECT_EQ(err.at("error").as_string(), "invalidParams");
        EXPECT_EQ(err.at("error_message").as_string(), "Malformed cursor.");
    });
    runSpawn([this](auto yield) {
        auto const handler = AnyHandler{AccountLinesHandler{backend_}};
        auto const input = json::parse(
            fmt::format(
                R"JSON({{
                    "account": "{}",
                    "marker": 401
                }})JSON",
                kAccount
            )
        );
        auto const output = handler.process(input, Context{yield});
        ASSERT_FALSE(output);

        auto const err = rpc::makeError(output.result.error());
        EXPECT_EQ(err.at("error").as_string(), "invalidParams");
    });
}

// error case: account invalid format, length is incorrect
TEST_F(RPCAccountLinesHandlerTest, AccountInvalidFormat)
{
    runSpawn([this](auto yield) {
        auto const handler = AnyHandler{AccountLinesHandler{backend_}};
        auto const input = json::parse(
            R"JSON({
                "account": "rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jp"
            })JSON"
        );
        auto const output = handler.process(input, Context{yield});
        ASSERT_FALSE(output);
        auto const err = rpc::makeError(output.result.error());
        EXPECT_EQ(err.at("error").as_string(), "actMalformed");
        EXPECT_EQ(err.at("error_message").as_string(), "Account malformed.");
    });
}

// error case: account invalid format
TEST_F(RPCAccountLinesHandlerTest, AccountNotString)
{
    runSpawn([this](auto yield) {
        auto const handler = AnyHandler{AccountLinesHandler{backend_}};
        auto const input = json::parse(
            R"JSON({
                "account": 12
            })JSON"
        );
        auto const output = handler.process(input, Context{yield});
        ASSERT_FALSE(output);

        auto const err = rpc::makeError(output.result.error());
        EXPECT_EQ(err.at("error").as_string(), "actMalformed");
        EXPECT_EQ(err.at("error_message").as_string(), "Account malformed.");
    });
}

TEST_F(RPCAccountLinesHandlerTest, PeerInvalidFormat)
{
    runSpawn([this](auto yield) {
        auto const handler = AnyHandler{AccountLinesHandler{backend_}};
        auto const input = json::parse(
            R"JSON({
                "account": "rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jpn",
                "peer": "rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jp"
            })JSON"
        );
        auto const output = handler.process(input, Context{yield});
        ASSERT_FALSE(output);
        auto const err = rpc::makeError(output.result.error());
        EXPECT_EQ(err.at("error").as_string(), "actMalformed");
        EXPECT_EQ(err.at("error_message").as_string(), "Account malformed.");
    });
}

TEST_F(RPCAccountLinesHandlerTest, PeerNotString)
{
    runSpawn([this](auto yield) {
        auto const handler = AnyHandler{AccountLinesHandler{backend_}};
        auto const input = json::parse(
            R"JSON({
                "account": "rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jpn",
                "peer": 12
            })JSON"
        );
        auto const output = handler.process(input, Context{yield});
        ASSERT_FALSE(output);

        auto const err = rpc::makeError(output.result.error());
        EXPECT_EQ(err.at("error").as_string(), "actMalformed");
        EXPECT_EQ(err.at("error_message").as_string(), "Account malformed.");
    });
}

TEST_F(RPCAccountLinesHandlerTest, LimitNotInt)
{
    runSpawn([this](auto yield) {
        auto const handler = AnyHandler{AccountLinesHandler{backend_}};
        auto const input = json::parse(
            R"JSON({
                "account": "rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jpn",
                "limit": "t"
            })JSON"
        );
        auto const output = handler.process(input, Context{yield});
        ASSERT_FALSE(output);

        auto const err = rpc::makeError(output.result.error());
        EXPECT_EQ(err.at("error").as_string(), "invalidParams");
    });
}

TEST_F(RPCAccountLinesHandlerTest, LimitNegative)
{
    runSpawn([this](auto yield) {
        auto const handler = AnyHandler{AccountLinesHandler{backend_}};
        auto const input = json::parse(
            R"JSON({
                "account": "rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jpn",
                "limit": -1
            })JSON"
        );
        auto const output = handler.process(input, Context{yield});
        ASSERT_FALSE(output);

        auto const err = rpc::makeError(output.result.error());
        EXPECT_EQ(err.at("error").as_string(), "invalidParams");
    });
}

TEST_F(RPCAccountLinesHandlerTest, LimitZero)
{
    runSpawn([this](auto yield) {
        auto const handler = AnyHandler{AccountLinesHandler{backend_}};
        auto const input = json::parse(
            R"JSON({
                "account": "rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jpn",
                "limit": 0
            })JSON"
        );
        auto const output = handler.process(input, Context{yield});
        ASSERT_FALSE(output);

        auto const err = rpc::makeError(output.result.error());
        EXPECT_EQ(err.at("error").as_string(), "invalidParams");
    });
}

// error case ledger non exist via hash
TEST_F(RPCAccountLinesHandlerTest, NonExistLedgerViaLedgerHash)
{
    // mock fetchLedgerByHash return empty
    ON_CALL(*backend_, fetchLedgerByHash(ripple::uint256{kLedgerHash}, _))
        .WillByDefault(Return(std::optional<ripple::LedgerHeader>{}));
    EXPECT_CALL(*backend_, fetchLedgerByHash).Times(1);

    auto const input = json::parse(
        fmt::format(
            R"JSON({{
                "account": "{}",
                "ledger_hash": "{}"
            }})JSON",
            kAccount,
            kLedgerHash
        )
    );
    runSpawn([&, this](auto yield) {
        auto const handler = AnyHandler{AccountLinesHandler{backend_}};
        auto const output = handler.process(input, Context{yield});
        ASSERT_FALSE(output);

        auto const err = rpc::makeError(output.result.error());
        EXPECT_EQ(err.at("error").as_string(), "lgrNotFound");
        EXPECT_EQ(err.at("error_message").as_string(), "ledgerNotFound");
    });
}

// error case ledger non exist via index
TEST_F(RPCAccountLinesHandlerTest, NonExistLedgerViaLedgerStringIndex)
{
    // mock fetchLedgerBySequence return empty
    ON_CALL(*backend_, fetchLedgerBySequence)
        .WillByDefault(Return(std::optional<ripple::LedgerHeader>{}));
    EXPECT_CALL(*backend_, fetchLedgerBySequence).Times(1);
    auto const input = json::parse(
        fmt::format(
            R"JSON({{
                "account": "{}",
                "ledger_index": "4"
            }})JSON",
            kAccount
        )
    );
    runSpawn([&, this](auto yield) {
        auto const handler = AnyHandler{AccountLinesHandler{backend_}};
        auto const output = handler.process(input, Context{yield});
        ASSERT_FALSE(output);
        auto const err = rpc::makeError(output.result.error());
        EXPECT_EQ(err.at("error").as_string(), "lgrNotFound");
        EXPECT_EQ(err.at("error_message").as_string(), "ledgerNotFound");
    });
}

TEST_F(RPCAccountLinesHandlerTest, NonExistLedgerViaLedgerIntIndex)
{
    // mock fetchLedgerBySequence return empty
    ON_CALL(*backend_, fetchLedgerBySequence)
        .WillByDefault(Return(std::optional<ripple::LedgerHeader>{}));
    EXPECT_CALL(*backend_, fetchLedgerBySequence).Times(1);
    auto const input = json::parse(
        fmt::format(
            R"JSON({{
                "account": "{}",
                "ledger_index": 4
            }})JSON",
            kAccount
        )
    );
    runSpawn([&, this](auto yield) {
        auto const handler = AnyHandler{AccountLinesHandler{backend_}};
        auto const output = handler.process(input, Context{yield});
        ASSERT_FALSE(output);
        auto const err = rpc::makeError(output.result.error());
        EXPECT_EQ(err.at("error").as_string(), "lgrNotFound");
        EXPECT_EQ(err.at("error_message").as_string(), "ledgerNotFound");
    });
}

// error case ledger > max seq via hash
// idk why this case will happen in reality
TEST_F(RPCAccountLinesHandlerTest, NonExistLedgerViaLedgerHash2)
{
    // mock fetchLedgerByHash return ledger but seq is 31 > 30
    auto ledgerHeader = createLedgerHeader(kLedgerHash, 31);
    ON_CALL(*backend_, fetchLedgerByHash(ripple::uint256{kLedgerHash}, _))
        .WillByDefault(Return(ledgerHeader));
    EXPECT_CALL(*backend_, fetchLedgerByHash).Times(1);
    auto const input = json::parse(
        fmt::format(
            R"JSON({{
                "account": "{}",
                "ledger_hash": "{}"
            }})JSON",
            kAccount,
            kLedgerHash
        )
    );
    runSpawn([&, this](auto yield) {
        auto const handler = AnyHandler{AccountLinesHandler{backend_}};
        auto const output = handler.process(input, Context{yield});
        ASSERT_FALSE(output);
        auto const err = rpc::makeError(output.result.error());
        EXPECT_EQ(err.at("error").as_string(), "lgrNotFound");
        EXPECT_EQ(err.at("error_message").as_string(), "ledgerNotFound");
    });
}

// error case ledger > max seq via index
TEST_F(RPCAccountLinesHandlerTest, NonExistLedgerViaLedgerIndex2)
{
    // no need to check from db, call fetchLedgerBySequence 0 time
    // differ from previous logic
    EXPECT_CALL(*backend_, fetchLedgerBySequence).Times(0);
    auto const input = json::parse(
        fmt::format(
            R"JSON({{
                "account": "{}",
                "ledger_index": "31"
            }})JSON",
            kAccount
        )
    );
    runSpawn([&, this](auto yield) {
        auto const handler = AnyHandler{AccountLinesHandler{backend_}};
        auto const output = handler.process(input, Context{yield});
        ASSERT_FALSE(output);
        auto const err = rpc::makeError(output.result.error());
        EXPECT_EQ(err.at("error").as_string(), "lgrNotFound");
        EXPECT_EQ(err.at("error_message").as_string(), "ledgerNotFound");
    });
}

// error case account not exist
TEST_F(RPCAccountLinesHandlerTest, NonExistAccount)
{
    auto ledgerHeader = createLedgerHeader(kLedgerHash, 30);
    ON_CALL(*backend_, fetchLedgerByHash(ripple::uint256{kLedgerHash}, _))
        .WillByDefault(Return(ledgerHeader));
    EXPECT_CALL(*backend_, fetchLedgerByHash).Times(1);
    // fetch account object return empty
    ON_CALL(*backend_, doFetchLedgerObject).WillByDefault(Return(std::optional<Blob>{}));
    EXPECT_CALL(*backend_, doFetchLedgerObject).Times(1);
    auto const input = json::parse(
        fmt::format(
            R"JSON({{
                "account": "{}",
                "ledger_hash": "{}"
            }})JSON",
            kAccount,
            kLedgerHash
        )
    );
    runSpawn([&, this](auto yield) {
        auto const handler = AnyHandler{AccountLinesHandler{backend_}};
        auto const output = handler.process(input, Context{yield});
        ASSERT_FALSE(output);
        auto const err = rpc::makeError(output.result.error());
        EXPECT_EQ(err.at("error").as_string(), "actNotFound");
        EXPECT_EQ(err.at("error_message").as_string(), "Account not found.");
    });
}

// normal case when only provide account
TEST_F(RPCAccountLinesHandlerTest, DefaultParameterTest)
{
    auto ledgerHeader = createLedgerHeader(kLedgerHash, 30);
    ON_CALL(*backend_, fetchLedgerBySequence).WillByDefault(Return(ledgerHeader));
    EXPECT_CALL(*backend_, fetchLedgerBySequence).Times(1);
    // fetch account object return something
    auto account = getAccountIdWithString(kAccount);
    auto accountKk = ripple::keylet::account(account).key;
    auto owneDirKk = ripple::keylet::ownerDir(account).key;
    auto fake = Blob{'f', 'a', 'k', 'e'};
    // return a non empty account
    ON_CALL(*backend_, doFetchLedgerObject(accountKk, testing::_, testing::_))
        .WillByDefault(Return(fake));

    // return owner index containing 2 indexes
    ripple::STObject const ownerDir =
        createOwnerDirLedgerObject({ripple::uint256{kIndex1}, ripple::uint256{kIndex2}}, kIndex1);

    ON_CALL(*backend_, doFetchLedgerObject(owneDirKk, testing::_, testing::_))
        .WillByDefault(Return(ownerDir.getSerializer().peekData()));
    EXPECT_CALL(*backend_, doFetchLedgerObject).Times(2);

    // return two trust lines
    std::vector<Blob> bbs;
    auto const line1 = createRippleStateLedgerObject(
        "USD", kAccount2, 10, kAccount, 100, kAccount2, 200, kTxnId, 123
    );
    auto const line2 = createRippleStateLedgerObject(
        "USD", kAccount, 10, kAccount2, 100, kAccount, 200, kTxnId, 123
    );
    bbs.push_back(line1.getSerializer().peekData());
    bbs.push_back(line2.getSerializer().peekData());
    ON_CALL(*backend_, doFetchLedgerObjects).WillByDefault(Return(bbs));
    EXPECT_CALL(*backend_, doFetchLedgerObjects).Times(1);

    runSpawn([this](auto yield) {
        auto const input = json::parse(
            fmt::format(
                R"JSON({{
                    "account": "{}"
                }})JSON",
                kAccount
            )
        );
        auto const correctOutput =
            R"JSON({
                "account": "rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jpn",
                "ledger_hash": "4BC50C9B0D8515D3EAAE1E74B29A95804346C491EE1A95BF25E4AAB854A6A652",
                "ledger_index": 30,
                "validated": true,
                "limit": 200,
                "lines": [
                    {
                        "account": "rLEsXccBGNR3UPuPu2hUXPjziKC3qKSBun",
                        "balance": "10",
                        "currency": "USD",
                        "limit": "100",
                        "limit_peer": "200",
                        "quality_in": 0,
                        "quality_out": 0
                    },
                    {
                        "account": "rLEsXccBGNR3UPuPu2hUXPjziKC3qKSBun",
                        "balance": "-10",
                        "currency": "USD",
                        "limit": "200",
                        "limit_peer": "100",
                        "quality_in": 0,
                        "quality_out": 0
                    }
                ]
            })JSON";

        auto handler = AnyHandler{AccountLinesHandler{this->backend_}};
        auto const output = handler.process(input, Context{yield});
        ASSERT_TRUE(output);
        EXPECT_EQ(json::parse(correctOutput), *output.result);
    });
}

// normal case : limit is used
TEST_F(RPCAccountLinesHandlerTest, UseLimit)
{
    auto ledgerHeader = createLedgerHeader(kLedgerHash, 30);
    ON_CALL(*backend_, fetchLedgerBySequence).WillByDefault(Return(ledgerHeader));
    EXPECT_CALL(*backend_, fetchLedgerBySequence).Times(3);
    // fetch account object return something
    auto account = getAccountIdWithString(kAccount);
    auto accountKk = ripple::keylet::account(account).key;
    auto owneDirKk = ripple::keylet::ownerDir(account).key;
    auto fake = Blob{'f', 'a', 'k', 'e'};
    // return a non empty account
    ON_CALL(*backend_, doFetchLedgerObject(accountKk, testing::_, testing::_))
        .WillByDefault(Return(fake));

    // return owner index
    std::vector<ripple::uint256> indexes;
    std::vector<Blob> bbs;

    auto repetitions = 50;
    while ((repetitions--) != 0) {
        indexes.emplace_back(kIndex1);
        auto const line = createRippleStateLedgerObject(
            "USD", kAccount2, 10, kAccount, 100, kAccount2, 200, kTxnId, 123
        );
        bbs.push_back(line.getSerializer().peekData());
    }
    ripple::STObject ownerDir = createOwnerDirLedgerObject(indexes, kIndex1);
    // it should not appear in return marker,marker is the current page
    ownerDir.setFieldU64(ripple::sfIndexNext, 99);
    ON_CALL(*backend_, doFetchLedgerObject(owneDirKk, testing::_, testing::_))
        .WillByDefault(Return(ownerDir.getSerializer().peekData()));
    EXPECT_CALL(*backend_, doFetchLedgerObject).Times(7);

    ON_CALL(*backend_, doFetchLedgerObjects).WillByDefault(Return(bbs));
    EXPECT_CALL(*backend_, doFetchLedgerObjects).Times(3);

    runSpawn([this](auto yield) {
        auto handler = AnyHandler{AccountLinesHandler{this->backend_}};
        auto const input = json::parse(
            fmt::format(
                R"JSON({{
                    "account": "{}",
                    "limit": 20
                }})JSON",
                kAccount
            )
        );
        auto const output = handler.process(input, Context{yield});
        ASSERT_TRUE(output);

        EXPECT_EQ(output.result->as_object().at("lines").as_array().size(), 20);
        EXPECT_THAT(
            boost::json::value_to<std::string>(output.result->as_object().at("marker")),
            EndsWith(",0")
        );
    });

    runSpawn([this](auto yield) {
        auto const handler = AnyHandler{AccountLinesHandler{backend_}};
        auto const input = json::parse(
            fmt::format(
                R"JSON({{
                    "account": "{}",
                    "limit": 9
                }})JSON",
                kAccount
            )
        );
        auto const output = handler.process(input, Context{yield});
        ASSERT_TRUE(output);  // todo: check limit somehow?
    });

    runSpawn([this](auto yield) {
        auto const handler = AnyHandler{AccountLinesHandler{backend_}};
        auto const input = json::parse(
            fmt::format(
                R"JSON({{
                    "account": "{}",
                    "limit": 401
                }})JSON",
                kAccount
            )
        );
        auto const output = handler.process(input, Context{yield});
        ASSERT_TRUE(output);  // todo: check limit somehow?
    });
}

// normal case : destination is used
TEST_F(RPCAccountLinesHandlerTest, UseDestination)
{
    auto ledgerHeader = createLedgerHeader(kLedgerHash, 30);
    ON_CALL(*backend_, fetchLedgerBySequence).WillByDefault(Return(ledgerHeader));
    EXPECT_CALL(*backend_, fetchLedgerBySequence).Times(1);
    // fetch account object return something
    auto account = getAccountIdWithString(kAccount);
    auto accountKk = ripple::keylet::account(account).key;
    auto owneDirKk = ripple::keylet::ownerDir(account).key;
    auto fake = Blob{'f', 'a', 'k', 'e'};
    // return a non empty account
    ON_CALL(*backend_, doFetchLedgerObject(accountKk, testing::_, testing::_))
        .WillByDefault(Return(fake));

    // return owner index
    std::vector<ripple::uint256> indexes;
    std::vector<Blob> bbs;

    // 10 lines to Account2
    auto repetitions = 10;
    while ((repetitions--) != 0) {
        indexes.emplace_back(kIndex1);
        auto const line = createRippleStateLedgerObject(
            "USD", kAccount2, 10, kAccount, 100, kAccount2, 200, kTxnId, 123
        );
        bbs.push_back(line.getSerializer().peekData());
    }

    // 20 lines to Account3
    repetitions = 20;
    while ((repetitions--) != 0) {
        indexes.emplace_back(kIndex1);
        auto const line = createRippleStateLedgerObject(
            "USD", kAccount3, 10, kAccount, 100, kAccount3, 200, kTxnId, 123
        );
        bbs.push_back(line.getSerializer().peekData());
    }

    ripple::STObject const ownerDir = createOwnerDirLedgerObject(indexes, kIndex1);
    ON_CALL(*backend_, doFetchLedgerObject(owneDirKk, testing::_, testing::_))
        .WillByDefault(Return(ownerDir.getSerializer().peekData()));
    EXPECT_CALL(*backend_, doFetchLedgerObject).Times(2);

    ON_CALL(*backend_, doFetchLedgerObjects).WillByDefault(Return(bbs));
    EXPECT_CALL(*backend_, doFetchLedgerObjects).Times(1);

    auto const input = json::parse(
        fmt::format(
            R"JSON({{
                "account": "{}",
                "limit": 30,
                "peer": "{}"
            }})JSON",
            kAccount,
            kAccount3
        )
    );
    runSpawn([&, this](auto yield) {
        auto handler = AnyHandler{AccountLinesHandler{this->backend_}};
        auto const output = handler.process(input, Context{yield});
        ASSERT_TRUE(output);
        EXPECT_EQ(output.result->as_object().at("lines").as_array().size(), 20);
    });
}

// normal case : but the lines is empty
TEST_F(RPCAccountLinesHandlerTest, EmptyChannel)
{
    auto ledgerHeader = createLedgerHeader(kLedgerHash, 30);
    ON_CALL(*backend_, fetchLedgerBySequence).WillByDefault(Return(ledgerHeader));
    EXPECT_CALL(*backend_, fetchLedgerBySequence).Times(1);
    // fetch account object return something
    auto account = getAccountIdWithString(kAccount);
    auto accountKk = ripple::keylet::account(account).key;
    auto owneDirKk = ripple::keylet::ownerDir(account).key;
    auto fake = Blob{'f', 'a', 'k', 'e'};
    // return a non empty account
    ON_CALL(*backend_, doFetchLedgerObject(accountKk, testing::_, testing::_))
        .WillByDefault(Return(fake));

    // return owner index
    ripple::STObject const ownerDir = createOwnerDirLedgerObject({}, kIndex1);

    ON_CALL(*backend_, doFetchLedgerObject(owneDirKk, testing::_, testing::_))
        .WillByDefault(Return(ownerDir.getSerializer().peekData()));
    EXPECT_CALL(*backend_, doFetchLedgerObject).Times(2);
    auto const input = json::parse(
        fmt::format(
            R"JSON({{
                "account": "{}"
            }})JSON",
            kAccount
        )
    );
    runSpawn([&, this](auto yield) {
        auto handler = AnyHandler{AccountLinesHandler{this->backend_}};
        auto const output = handler.process(input, Context{yield});
        ASSERT_TRUE(output);
        EXPECT_EQ(output.result->as_object().at("lines").as_array().size(), 0);
    });
}

TEST_F(RPCAccountLinesHandlerTest, OptionalResponseFieldWithDeepFreeze)
{
    static constexpr auto kCorrectOutput = R"JSON({
        "account": "rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jpn",
        "ledger_hash": "4BC50C9B0D8515D3EAAE1E74B29A95804346C491EE1A95BF25E4AAB854A6A652",
        "ledger_index": 30,
        "validated": true,
        "limit": 200,
        "lines": [
            {
                "account": "rLEsXccBGNR3UPuPu2hUXPjziKC3qKSBun",
                "balance": "10",
                "currency": "USD",
                "limit": "100",
                "limit_peer": "200",
                "quality_in": 0,
                "quality_out": 0,
                "no_ripple_peer": true,
                "peer_authorized": true,
                "freeze_peer": true,
                "deep_freeze_peer": true
            },
            {
                "account": "rLEsXccBGNR3UPuPu2hUXPjziKC3qKSBun",
                "balance": "20",
                "currency": "USD",
                "limit": "200",
                "limit_peer": "400",
                "quality_in": 0,
                "quality_out": 0,
                "no_ripple": true,
                "authorized": true,
                "freeze": true,
                "deep_freeze": true
            }
        ]
    })JSON";

    auto ledgerHeader = createLedgerHeader(kLedgerHash, 30);
    ON_CALL(*backend_, fetchLedgerBySequence).WillByDefault(Return(ledgerHeader));
    EXPECT_CALL(*backend_, fetchLedgerBySequence).Times(1);
    // fetch account object return something
    auto account = getAccountIdWithString(kAccount);
    auto accountKk = ripple::keylet::account(account).key;
    auto owneDirKk = ripple::keylet::ownerDir(account).key;
    auto fake = Blob{'f', 'a', 'k', 'e'};

    // return a non empty account
    ON_CALL(*backend_, doFetchLedgerObject(accountKk, testing::_, testing::_))
        .WillByDefault(Return(fake));

    // return owner index
    ripple::STObject const ownerDir =
        createOwnerDirLedgerObject({ripple::uint256{kIndex1}, ripple::uint256{kIndex2}}, kIndex1);

    ON_CALL(*backend_, doFetchLedgerObject(owneDirKk, testing::_, testing::_))
        .WillByDefault(Return(ownerDir.getSerializer().peekData()));
    EXPECT_CALL(*backend_, doFetchLedgerObject).Times(2);

    // return few trust lines
    std::vector<Blob> bbs;
    auto line1 = createRippleStateLedgerObject(
        "USD", kAccount2, 10, kAccount, 100, kAccount2, 200, kTxnId, 0
    );
    line1.setFlag(ripple::lsfHighAuth);
    line1.setFlag(ripple::lsfHighNoRipple);
    line1.setFlag(ripple::lsfHighFreeze);
    line1.setFlag(ripple::lsfHighDeepFreeze);
    bbs.push_back(line1.getSerializer().peekData());

    auto line2 = createRippleStateLedgerObject(
        "USD", kAccount2, 20, kAccount, 200, kAccount2, 400, kTxnId, 0
    );
    line2.setFlag(ripple::lsfLowAuth);
    line2.setFlag(ripple::lsfLowNoRipple);
    line2.setFlag(ripple::lsfLowFreeze);
    line2.setFlag(ripple::lsfLowDeepFreeze);
    bbs.push_back(line2.getSerializer().peekData());

    ON_CALL(*backend_, doFetchLedgerObjects).WillByDefault(Return(bbs));
    EXPECT_CALL(*backend_, doFetchLedgerObjects).Times(1);
    auto const input = json::parse(
        fmt::format(
            R"JSON({{
                "account": "{}"
            }})JSON",
            kAccount
        )
    );
    runSpawn([&, this](auto yield) {
        auto handler = AnyHandler{AccountLinesHandler{this->backend_}};
        auto const output = handler.process(input, Context{yield});
        ASSERT_TRUE(output);
        EXPECT_EQ(json::parse(kCorrectOutput), *output.result);
    });
}

TEST_F(RPCAccountLinesHandlerTest, FrozenTrustLineResponse)
{
    static constexpr auto kCorrectOutput = R"JSON({
        "account": "rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jpn",
        "ledger_hash": "4BC50C9B0D8515D3EAAE1E74B29A95804346C491EE1A95BF25E4AAB854A6A652",
        "ledger_index": 30,
        "validated": true,
        "limit": 200,
        "lines": [
            {
                "account": "rLEsXccBGNR3UPuPu2hUXPjziKC3qKSBun",
                "balance": "10",
                "currency": "USD",
                "limit": "100",
                "limit_peer": "200",
                "quality_in": 0,
                "quality_out": 0,
                "peer_authorized": true,
                "freeze_peer": true
            },
            {
                "account": "rLEsXccBGNR3UPuPu2hUXPjziKC3qKSBun",
                "balance": "20",
                "currency": "USD",
                "limit": "200",
                "limit_peer": "400",
                "quality_in": 0,
                "quality_out": 0,
                "authorized": true,
                "freeze": true
            }
        ]
    })JSON";

    auto ledgerHeader = createLedgerHeader(kLedgerHash, 30);
    EXPECT_CALL(*backend_, fetchLedgerBySequence).WillOnce(Return(ledgerHeader));

    // fetch account object return something
    auto account = getAccountIdWithString(kAccount);
    auto accountKk = ripple::keylet::account(account).key;
    auto owneDirKk = ripple::keylet::ownerDir(account).key;
    auto fake = Blob{'f', 'a', 'k', 'e'};

    // return a non empty account
    ON_CALL(*backend_, doFetchLedgerObject(accountKk, testing::_, testing::_))
        .WillByDefault(Return(fake));

    // return owner index
    ripple::STObject const ownerDir =
        createOwnerDirLedgerObject({ripple::uint256{kIndex1}, ripple::uint256{kIndex2}}, kIndex1);

    ON_CALL(*backend_, doFetchLedgerObject(owneDirKk, testing::_, testing::_))
        .WillByDefault(Return(ownerDir.getSerializer().peekData()));

    // return few trust lines
    std::vector<Blob> bbs;
    auto line1 = createRippleStateLedgerObject(
        "USD", kAccount2, 10, kAccount, 100, kAccount2, 200, kTxnId, 0
    );
    line1.setFlag(ripple::lsfHighAuth);
    line1.setFlag(ripple::lsfHighFreeze);
    bbs.push_back(line1.getSerializer().peekData());

    auto line2 = createRippleStateLedgerObject(
        "USD", kAccount2, 20, kAccount, 200, kAccount2, 400, kTxnId, 0
    );
    line2.setFlag(ripple::lsfLowAuth);
    line2.setFlag(ripple::lsfLowFreeze);
    bbs.push_back(line2.getSerializer().peekData());

    EXPECT_CALL(*backend_, doFetchLedgerObjects).WillOnce(Return(bbs));
    auto const input = json::parse(
        fmt::format(
            R"JSON({{
                "account": "{}"
            }})JSON",
            kAccount
        )
    );
    runSpawn([&, this](auto yield) {
        auto handler = AnyHandler{AccountLinesHandler{this->backend_}};
        auto const output = handler.process(input, Context{yield});
        ASSERT_TRUE(output);
        EXPECT_EQ(json::parse(kCorrectOutput), *output.result);
    });
}

// normal case : test marker output correct
TEST_F(RPCAccountLinesHandlerTest, MarkerOutput)
{
    auto account = getAccountIdWithString(kAccount);
    auto accountKk = ripple::keylet::account(account).key;
    auto ownerDirKk = ripple::keylet::ownerDir(account).key;
    static constexpr auto kNextPage = 99;
    static constexpr auto kLimit = 15;
    auto ownerDir2Kk = ripple::keylet::page(ripple::keylet::ownerDir(account), kNextPage).key;
    auto ledgerHeader = createLedgerHeader(kLedgerHash, 30);
    ON_CALL(*backend_, fetchLedgerBySequence).WillByDefault(Return(ledgerHeader));
    EXPECT_CALL(*backend_, fetchLedgerBySequence).Times(1);
    // fetch account object return something
    auto fake = Blob{'f', 'a', 'k', 'e'};
    ON_CALL(*backend_, doFetchLedgerObject(accountKk, testing::_, testing::_))
        .WillByDefault(Return(fake));
    EXPECT_CALL(*backend_, doFetchLedgerObject).Times(3);

    std::vector<Blob> bbs;
    auto line = createRippleStateLedgerObject(
        "USD", kAccount2, 10, kAccount, 100, kAccount2, 200, kTxnId, 0
    );

    // owner dir contains 10 indexes
    int objectsCount = 10;
    std::vector<ripple::uint256> indexes;
    while (objectsCount != 0) {
        // return owner index
        indexes.emplace_back(kIndex1);
        objectsCount--;
    }
    // return 15 objects
    objectsCount = 15;
    while (objectsCount != 0) {
        bbs.push_back(line.getSerializer().peekData());
        objectsCount--;
    }

    ripple::STObject ownerDir = createOwnerDirLedgerObject(indexes, kIndex1);
    ownerDir.setFieldU64(ripple::sfIndexNext, kNextPage);
    // first page's next page is 99
    ON_CALL(*backend_, doFetchLedgerObject(ownerDirKk, testing::_, testing::_))
        .WillByDefault(Return(ownerDir.getSerializer().peekData()));
    ripple::STObject ownerDir2 = createOwnerDirLedgerObject(indexes, kIndex1);
    // second page's next page is 0
    ownerDir2.setFieldU64(ripple::sfIndexNext, 0);
    ON_CALL(*backend_, doFetchLedgerObject(ownerDir2Kk, testing::_, testing::_))
        .WillByDefault(Return(ownerDir2.getSerializer().peekData()));

    ON_CALL(*backend_, doFetchLedgerObjects).WillByDefault(Return(bbs));
    EXPECT_CALL(*backend_, doFetchLedgerObjects).Times(1);

    auto const input = json::parse(
        fmt::format(
            R"JSON({{
                "account": "{}",
                "limit": {}
            }})JSON",
            kAccount,
            kLimit
        )
    );
    runSpawn([&, this](auto yield) {
        auto handler = AnyHandler{AccountLinesHandler{this->backend_}};
        auto const output = handler.process(input, Context{yield});
        ASSERT_TRUE(output);
        EXPECT_EQ(
            boost::json::value_to<std::string>(output.result->as_object().at("marker")),
            fmt::format("{},{}", kIndex1, kNextPage)
        );
        EXPECT_EQ(output.result->as_object().at("lines").as_array().size(), 15);
    });
}

// normal case : handler marker correctly
TEST_F(RPCAccountLinesHandlerTest, MarkerInput)
{
    auto account = getAccountIdWithString(kAccount);
    auto accountKk = ripple::keylet::account(account).key;
    static constexpr auto kNextPage = 99;
    static constexpr auto kLimit = 15;
    auto ownerDirKk = ripple::keylet::page(ripple::keylet::ownerDir(account), kNextPage).key;
    auto ledgerHeader = createLedgerHeader(kLedgerHash, 30);
    ON_CALL(*backend_, fetchLedgerBySequence).WillByDefault(Return(ledgerHeader));
    EXPECT_CALL(*backend_, fetchLedgerBySequence).Times(1);
    // fetch account object return something
    auto fake = Blob{'f', 'a', 'k', 'e'};
    ON_CALL(*backend_, doFetchLedgerObject(accountKk, testing::_, testing::_))
        .WillByDefault(Return(fake));
    EXPECT_CALL(*backend_, doFetchLedgerObject).Times(3);

    std::vector<Blob> bbs;
    auto const line = createRippleStateLedgerObject(
        "USD", kAccount2, 10, kAccount, 100, kAccount2, 200, kTxnId, 0
    );
    int objectsCount = kLimit;
    std::vector<ripple::uint256> indexes;
    while (objectsCount != 0) {
        // return owner index
        indexes.emplace_back(kIndex1);
        bbs.push_back(line.getSerializer().peekData());
        objectsCount--;
    }

    ripple::STObject ownerDir = createOwnerDirLedgerObject(indexes, kIndex1);
    ownerDir.setFieldU64(ripple::sfIndexNext, 0);
    ON_CALL(*backend_, doFetchLedgerObject(ownerDirKk, testing::_, testing::_))
        .WillByDefault(Return(ownerDir.getSerializer().peekData()));

    ON_CALL(*backend_, doFetchLedgerObjects).WillByDefault(Return(bbs));
    EXPECT_CALL(*backend_, doFetchLedgerObjects).Times(1);

    auto const input = json::parse(
        fmt::format(
            R"JSON({{
                "account": "{}",
                "limit": {},
                "marker": "{},{}"
            }})JSON",
            kAccount,
            kLimit,
            kIndex1,
            kNextPage
        )
    );
    runSpawn([&, this](auto yield) {
        auto handler = AnyHandler{AccountLinesHandler{this->backend_}};
        auto const output = handler.process(input, Context{yield});
        ASSERT_TRUE(output);
        EXPECT_TRUE(output.result->as_object().if_contains("marker") == nullptr);
        // the first item is the marker itself, so the result will have limit-1
        // items
        EXPECT_EQ(output.result->as_object().at("lines").as_array().size(), kLimit - 1);
    });
}

TEST_F(RPCAccountLinesHandlerTest, LimitLessThanMin)
{
    auto ledgerHeader = createLedgerHeader(kLedgerHash, 30);
    ON_CALL(*backend_, fetchLedgerBySequence).WillByDefault(Return(ledgerHeader));
    EXPECT_CALL(*backend_, fetchLedgerBySequence).Times(1);
    // fetch account object return something
    auto account = getAccountIdWithString(kAccount);
    auto accountKk = ripple::keylet::account(account).key;
    auto owneDirKk = ripple::keylet::ownerDir(account).key;
    auto fake = Blob{'f', 'a', 'k', 'e'};
    // return a non empty account
    ON_CALL(*backend_, doFetchLedgerObject(accountKk, testing::_, testing::_))
        .WillByDefault(Return(fake));

    // return owner index containing 2 indexes
    ripple::STObject const ownerDir =
        createOwnerDirLedgerObject({ripple::uint256{kIndex1}, ripple::uint256{kIndex2}}, kIndex1);

    ON_CALL(*backend_, doFetchLedgerObject(owneDirKk, testing::_, testing::_))
        .WillByDefault(Return(ownerDir.getSerializer().peekData()));
    EXPECT_CALL(*backend_, doFetchLedgerObject).Times(2);

    // return two trust lines
    std::vector<Blob> bbs;
    auto const line1 = createRippleStateLedgerObject(
        "USD", kAccount2, 10, kAccount, 100, kAccount2, 200, kTxnId, 123
    );
    auto const line2 = createRippleStateLedgerObject(
        "USD", kAccount, 10, kAccount2, 100, kAccount, 200, kTxnId, 123
    );
    bbs.push_back(line1.getSerializer().peekData());
    bbs.push_back(line2.getSerializer().peekData());
    ON_CALL(*backend_, doFetchLedgerObjects).WillByDefault(Return(bbs));
    EXPECT_CALL(*backend_, doFetchLedgerObjects).Times(1);

    runSpawn([this](auto yield) {
        auto const input = json::parse(
            fmt::format(
                R"JSON({{
                    "account": "{}",
                    "limit": {}
                }})JSON",
                kAccount,
                AccountLinesHandler::kLimitMin - 1
            )
        );
        auto const correctOutput = fmt::format(
            R"JSON({{
                "account": "rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jpn",
                "ledger_hash": "4BC50C9B0D8515D3EAAE1E74B29A95804346C491EE1A95BF25E4AAB854A6A652",
                "ledger_index": 30,
                "validated": true,
                "limit": {},
                "lines": [
                    {{
                        "account": "rLEsXccBGNR3UPuPu2hUXPjziKC3qKSBun",
                        "balance": "10",
                        "currency": "USD",
                        "limit": "100",
                        "limit_peer": "200",
                        "quality_in": 0,
                        "quality_out": 0
                    }},
                    {{
                        "account": "rLEsXccBGNR3UPuPu2hUXPjziKC3qKSBun",
                        "balance": "-10",
                        "currency": "USD",
                        "limit": "200",
                        "limit_peer": "100",
                        "quality_in": 0,
                        "quality_out": 0
                    }}
                ]
            }})JSON",
            AccountLinesHandler::kLimitMin
        );

        auto handler = AnyHandler{AccountLinesHandler{this->backend_}};
        auto const output = handler.process(input, Context{yield});
        ASSERT_TRUE(output);
        EXPECT_EQ(json::parse(correctOutput), *output.result);
    });
}

TEST_F(RPCAccountLinesHandlerTest, LimitMoreThanMax)
{
    auto ledgerHeader = createLedgerHeader(kLedgerHash, 30);
    ON_CALL(*backend_, fetchLedgerBySequence).WillByDefault(Return(ledgerHeader));
    EXPECT_CALL(*backend_, fetchLedgerBySequence).Times(1);
    // fetch account object return something
    auto account = getAccountIdWithString(kAccount);
    auto accountKk = ripple::keylet::account(account).key;
    auto owneDirKk = ripple::keylet::ownerDir(account).key;
    auto fake = Blob{'f', 'a', 'k', 'e'};
    // return a non empty account
    ON_CALL(*backend_, doFetchLedgerObject(accountKk, testing::_, testing::_))
        .WillByDefault(Return(fake));

    // return owner index containing 2 indexes
    ripple::STObject const ownerDir =
        createOwnerDirLedgerObject({ripple::uint256{kIndex1}, ripple::uint256{kIndex2}}, kIndex1);

    ON_CALL(*backend_, doFetchLedgerObject(owneDirKk, testing::_, testing::_))
        .WillByDefault(Return(ownerDir.getSerializer().peekData()));
    EXPECT_CALL(*backend_, doFetchLedgerObject).Times(2);

    // return two trust lines
    std::vector<Blob> bbs;
    auto const line1 = createRippleStateLedgerObject(
        "USD", kAccount2, 10, kAccount, 100, kAccount2, 200, kTxnId, 123
    );
    auto const line2 = createRippleStateLedgerObject(
        "USD", kAccount, 10, kAccount2, 100, kAccount, 200, kTxnId, 123
    );
    bbs.push_back(line1.getSerializer().peekData());
    bbs.push_back(line2.getSerializer().peekData());
    ON_CALL(*backend_, doFetchLedgerObjects).WillByDefault(Return(bbs));
    EXPECT_CALL(*backend_, doFetchLedgerObjects).Times(1);

    runSpawn([this](auto yield) {
        auto const input = json::parse(
            fmt::format(
                R"JSON({{
                    "account": "{}",
                    "limit": {}
                }})JSON",
                kAccount,
                AccountLinesHandler::kLimitMax + 1
            )
        );
        auto const correctOutput = fmt::format(
            R"JSON({{
                "account": "rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jpn",
                "ledger_hash": "4BC50C9B0D8515D3EAAE1E74B29A95804346C491EE1A95BF25E4AAB854A6A652",
                "ledger_index": 30,
                "validated": true,
                "limit": {},
                "lines": [
                    {{
                        "account": "rLEsXccBGNR3UPuPu2hUXPjziKC3qKSBun",
                        "balance": "10",
                        "currency": "USD",
                        "limit": "100",
                        "limit_peer": "200",
                        "quality_in": 0,
                        "quality_out": 0
                    }},
                    {{
                        "account": "rLEsXccBGNR3UPuPu2hUXPjziKC3qKSBun",
                        "balance": "-10",
                        "currency": "USD",
                        "limit": "200",
                        "limit_peer": "100",
                        "quality_in": 0,
                        "quality_out": 0
                    }}
                ]
            }})JSON",
            AccountLinesHandler::kLimitMax
        );

        auto handler = AnyHandler{AccountLinesHandler{this->backend_}};
        auto const output = handler.process(input, Context{yield});
        ASSERT_TRUE(output);
        EXPECT_EQ(json::parse(correctOutput), *output.result);
    });
}

TEST(RPCAccountLinesHandlerSpecTest, DeprecatedFields)
{
    boost::json::value const json{
        {"account", "rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh"},
        {"peer", "rLEsXccBGNR3UPuPu2hUXPjziKC3qKSBun"},
        {"ignore_default", false},
        {"ledger_hash", "4BC50C9B0D8515D3EAAE1E74B29A95804346C491EE1A95BF25E4AAB854A6A652"},
        {"limit", 200},
        {"ledger_index", 30},
        {"marker", "rLEsXccBGNR3UPuPu2hUXPjziKC3qKSBun,0"},
        {"ledger", 123},
        {"strict", true},
        {"peer_index", 456}
    };
    auto const spec = AccountLinesHandler::spec(2);
    auto const warnings = spec.check(json);
    ASSERT_EQ(warnings.size(), 1);
    ASSERT_TRUE(warnings[0].is_object());
    auto const& warning = warnings[0].as_object();
    ASSERT_TRUE(warning.contains("id"));
    ASSERT_TRUE(warning.contains("message"));
    EXPECT_EQ(
        warning.at("id").as_int64(), static_cast<int64_t>(rpc::WarningCode::WarnRpcDeprecated)
    );
    for (auto const& field : {"ledger", "peer_index"}) {
        EXPECT_NE(
            warning.at("message").as_string().find(fmt::format("Field '{}' is deprecated.", field)),
            std::string::npos
        ) << warning;
    }
}