AccountObjects_test.cpp

#include <test/jtx.h>
#include <test/jtx/AMM.h>
#include <test/jtx/xchain_bridge.h>
 
#include <xrpld/app/tx/detail/NFTokenMint.h>
 
#include <xrpl/json/json_reader.h>
#include <xrpl/json/json_value.h>
#include <xrpl/json/to_string.h>
#include <xrpl/protocol/jss.h>
#include <xrpl/protocol/nft.h>
 
#include <boost/utility/string_ref.hpp>
 
#include <algorithm>
 
namespace xrpl {
namespace test {
 
static char const* bob_account_objects[] = {
    R"json({
  "Account" : "rPMh7Pi9ct699iZUTWaytJUoHcJ7cgyziK",
  "BookDirectory" : "50AD0A9E54D2B381288D535EB724E4275FFBF41580D28A925D038D7EA4C68000",
  "BookNode" : "0",
  "Flags" : 65536,
  "LedgerEntryType" : "Offer",
  "OwnerNode" : "0",
  "Sequence" : 6,
  "TakerGets" : {
    "currency" : "USD",
    "issuer" : "rPMh7Pi9ct699iZUTWaytJUoHcJ7cgyziK",
    "value" : "1"
  },
  "TakerPays" : "100000000",
  "index" : "29665262716C19830E26AEEC0916E476FC7D8EF195FF3B4F06829E64F82A3B3E"
})json",
    R"json({
    "Balance" : {
        "currency" : "USD",
        "issuer" : "rrrrrrrrrrrrrrrrrrrrBZbvji",
        "value" : "-1000"
    },
    "Flags" : 131072,
    "HighLimit" : {
        "currency" : "USD",
        "issuer" : "rPMh7Pi9ct699iZUTWaytJUoHcJ7cgyziK",
        "value" : "1000"
    },
    "HighNode" : "0",
    "LedgerEntryType" : "RippleState",
    "LowLimit" : {
        "currency" : "USD",
        "issuer" : "r9cZvwKU3zzuZK9JFovGg1JC5n7QiqNL8L",
        "value" : "0"
    },
    "LowNode" : "0",
    "index" : "D13183BCFFC9AAC9F96AEBB5F66E4A652AD1F5D10273AEB615478302BEBFD4A4"
})json",
    R"json({
    "Balance" : {
        "currency" : "USD",
        "issuer" : "rrrrrrrrrrrrrrrrrrrrBZbvji",
        "value" : "-1000"
    },
    "Flags" : 131072,
    "HighLimit" : {
        "currency" : "USD",
        "issuer" : "rPMh7Pi9ct699iZUTWaytJUoHcJ7cgyziK",
        "value" : "1000"
    },
    "HighNode" : "0",
    "LedgerEntryType" : "RippleState",
    "LowLimit" : {
        "currency" : "USD",
        "issuer" : "r32rQHyesiTtdWFU7UJVtff4nCR5SHCbJW",
        "value" : "0"
    },
    "LowNode" : "0",
    "index" : "D89BC239086183EB9458C396E643795C1134963E6550E682A190A5F021766D43"
})json",
    R"json({
    "Account" : "rPMh7Pi9ct699iZUTWaytJUoHcJ7cgyziK",
    "BookDirectory" : "B025997A323F5C3E03DDF1334471F5984ABDE31C59D463525D038D7EA4C68000",
    "BookNode" : "0",
    "Flags" : 65536,
    "LedgerEntryType" : "Offer",
    "OwnerNode" : "0",
    "Sequence" : 7,
    "TakerGets" : {
        "currency" : "USD",
        "issuer" : "r32rQHyesiTtdWFU7UJVtff4nCR5SHCbJW",
        "value" : "1"
    },
    "TakerPays" : "100000000",
    "index" : "F03ABE26CB8C5F4AFB31A86590BD25C64C5756FCE5CE9704C27AFE291A4A29A1"
})json"};
 
class AccountObjects_test : public beast::unit_test::suite
{
public:
    void
    testErrors()
    {
        testcase("error cases");
 
        using namespace jtx;
        Env env(*this);
 
        // test error on no account
        {
            Json::Value params;
            auto resp = env.rpc("json", "account_objects", to_string(params));
            BEAST_EXPECT(resp[jss::result][jss::error_message] == "Missing field 'account'.");
        }
        // test account non-string
        {
            auto testInvalidAccountParam = [&](auto const& param) {
                Json::Value params;
                params[jss::account] = param;
                auto jrr = env.rpc("json", "account_objects", to_string(params))[jss::result];
                BEAST_EXPECT(jrr[jss::error] == "invalidParams");
                BEAST_EXPECT(jrr[jss::error_message] == "Invalid field 'account'.");
            };
 
            testInvalidAccountParam(1);
            testInvalidAccountParam(1.1);
            testInvalidAccountParam(true);
            testInvalidAccountParam(Json::Value(Json::nullValue));
            testInvalidAccountParam(Json::Value(Json::objectValue));
            testInvalidAccountParam(Json::Value(Json::arrayValue));
        }
        // test error on  malformed account string.
        {
            Json::Value params;
            params[jss::account] = "n94JNrQYkDrpt62bbSR7nVEhdyAvcJXRAsjEkFYyqRkh9SUTYEqV";
            auto resp = env.rpc("json", "account_objects", to_string(params));
            BEAST_EXPECT(resp[jss::result][jss::error_message] == "Account malformed.");
        }
        // test error on account that's not in the ledger.
        {
            Json::Value params;
            params[jss::account] = Account{"bogie"}.human();
            auto resp = env.rpc("json", "account_objects", to_string(params));
            BEAST_EXPECT(resp[jss::result][jss::error_message] == "Account not found.");
        }
        Account const bob{"bob"};
        // test error on large ledger_index.
        {
            Json::Value params;
            params[jss::account] = bob.human();
            params[jss::ledger_index] = 10;
            auto resp = env.rpc("json", "account_objects", to_string(params));
            BEAST_EXPECT(resp[jss::result][jss::error_message] == "ledgerNotFound");
        }
 
        env.fund(XRP(1000), bob);
        // test error on type param not a string
        {
            Json::Value params;
            params[jss::account] = bob.human();
            params[jss::type] = 10;
            auto resp = env.rpc("json", "account_objects", to_string(params));
            BEAST_EXPECT(resp[jss::result][jss::error_message] == "Invalid field 'type', not string.");
        }
        // test error on type param not a valid type
        {
            Json::Value params;
            params[jss::account] = bob.human();
            params[jss::type] = "expedited";
            auto resp = env.rpc("json", "account_objects", to_string(params));
            BEAST_EXPECT(resp[jss::result][jss::error_message] == "Invalid field 'type'.");
        }
        // test error on limit -ve
        {
            Json::Value params;
            params[jss::account] = bob.human();
            params[jss::limit] = -1;
            auto resp = env.rpc("json", "account_objects", to_string(params));
            BEAST_EXPECT(resp[jss::result][jss::error_message] == "Invalid field 'limit', not unsigned integer.");
        }
        // test errors on marker
        {
            Account const gw{"G"};
            env.fund(XRP(1000), gw);
            auto const USD = gw["USD"];
            env.trust(USD(1000), bob);
            env(pay(gw, bob, XRP(1)));
            env(offer(bob, XRP(100), bob["USD"](1)), txflags(tfPassive));
 
            Json::Value params;
            params[jss::account] = bob.human();
            params[jss::limit] = 1;
            auto resp = env.rpc("json", "account_objects", to_string(params));
 
            auto resume_marker = resp[jss::result][jss::marker];
            std::string mark = to_string(resume_marker);
            params[jss::marker] = 10;
            resp = env.rpc("json", "account_objects", to_string(params));
            BEAST_EXPECT(resp[jss::result][jss::error_message] == "Invalid field 'marker', not string.");
 
            params[jss::marker] = "This is a string with no comma";
            resp = env.rpc("json", "account_objects", to_string(params));
            BEAST_EXPECT(resp[jss::result][jss::error_message] == "Invalid field 'marker'.");
 
            params[jss::marker] = "This string has a comma, but is not hex";
            resp = env.rpc("json", "account_objects", to_string(params));
            BEAST_EXPECT(resp[jss::result][jss::error_message] == "Invalid field 'marker'.");
 
            params[jss::marker] = std::string(&mark[1U], 64);
            resp = env.rpc("json", "account_objects", to_string(params));
            BEAST_EXPECT(resp[jss::result][jss::error_message] == "Invalid field 'marker'.");
 
            params[jss::marker] = std::string(&mark[1U], 65);
            resp = env.rpc("json", "account_objects", to_string(params));
            BEAST_EXPECT(resp[jss::result][jss::error_message] == "Invalid field 'marker'.");
 
            params[jss::marker] = std::string(&mark[1U], 65) + "not hex";
            resp = env.rpc("json", "account_objects", to_string(params));
            BEAST_EXPECT(resp[jss::result][jss::error_message] == "Invalid field 'marker'.");
 
            // Should this be an error?
            // A hex digit is absent from the end of marker.
            // No account objects returned.
            params[jss::marker] = std::string(&mark[1U], 128);
            resp = env.rpc("json", "account_objects", to_string(params));
            BEAST_EXPECT(resp[jss::result][jss::account_objects].size() == 0);
        }
    }
 
    void
    testUnsteppedThenStepped()
    {
        testcase("unsteppedThenStepped");
 
        using namespace jtx;
        Env env(*this);
 
        Account const gw1{"G1"};
        Account const gw2{"G2"};
        Account const bob{"bob"};
 
        auto const USD1 = gw1["USD"];
        auto const USD2 = gw2["USD"];
 
        env.fund(XRP(1000), gw1, gw2, bob);
        env.trust(USD1(1000), bob);
        env.trust(USD2(1000), bob);
 
        env(pay(gw1, bob, USD1(1000)));
        env(pay(gw2, bob, USD2(1000)));
 
        env(offer(bob, XRP(100), bob["USD"](1)), txflags(tfPassive));
        env(offer(bob, XRP(100), USD1(1)), txflags(tfPassive));
 
        Json::Value bobj[4];
        for (int i = 0; i < 4; ++i)
            Json::Reader{}.parse(bob_account_objects[i], bobj[i]);
 
        // test 'unstepped'
        // i.e. request account objects without explicit limit/marker paging
        {
            Json::Value params;
            params[jss::account] = bob.human();
            auto resp = env.rpc("json", "account_objects", to_string(params));
            BEAST_EXPECT(!resp.isMember(jss::marker));
 
            BEAST_EXPECT(resp[jss::result][jss::account_objects].size() == 4);
            for (int i = 0; i < 4; ++i)
            {
                auto& aobj = resp[jss::result][jss::account_objects][i];
                aobj.removeMember("PreviousTxnID");
                aobj.removeMember("PreviousTxnLgrSeq");
                BEAST_EXPECT(aobj == bobj[i]);
            }
        }
        // test request with type parameter as filter, unstepped
        {
            Json::Value params;
            params[jss::account] = bob.human();
            params[jss::type] = jss::state;
            auto resp = env.rpc("json", "account_objects", to_string(params));
            BEAST_EXPECT(!resp.isMember(jss::marker));
 
            BEAST_EXPECT(resp[jss::result][jss::account_objects].size() == 2);
            for (int i = 0; i < 2; ++i)
            {
                auto& aobj = resp[jss::result][jss::account_objects][i];
                aobj.removeMember("PreviousTxnID");
                aobj.removeMember("PreviousTxnLgrSeq");
                BEAST_EXPECT(aobj == bobj[i + 1]);
            }
        }
        // test stepped one-at-a-time with limit=1, resume from prev marker
        {
            Json::Value params;
            params[jss::account] = bob.human();
            params[jss::limit] = 1;
            for (int i = 0; i < 4; ++i)
            {
                auto resp = env.rpc("json", "account_objects", to_string(params));
                auto& aobjs = resp[jss::result][jss::account_objects];
                BEAST_EXPECT(aobjs.size() == 1);
                auto& aobj = aobjs[0U];
                if (i < 3)
                    BEAST_EXPECT(resp[jss::result][jss::limit] == 1);
                else
                    BEAST_EXPECT(!resp[jss::result].isMember(jss::limit));
 
                aobj.removeMember("PreviousTxnID");
                aobj.removeMember("PreviousTxnLgrSeq");
 
                BEAST_EXPECT(aobj == bobj[i]);
 
                params[jss::marker] = resp[jss::result][jss::marker];
            }
        }
    }
 
    void
    testUnsteppedThenSteppedWithNFTs()
    {
        // The preceding test case, unsteppedThenStepped(), found a bug in the
        // support for NFToken Pages.  So we're leaving that test alone when
        // adding tests to exercise NFTokenPages.
        testcase("unsteppedThenSteppedWithNFTs");
 
        using namespace jtx;
        Env env(*this);
 
        Account const gw1{"G1"};
        Account const gw2{"G2"};
        Account const bob{"bob"};
 
        auto const USD1 = gw1["USD"];
        auto const USD2 = gw2["USD"];
 
        env.fund(XRP(1000), gw1, gw2, bob);
        env.close();
 
        // Check behavior if there are no account objects.
        {
            // Unpaged
            Json::Value params;
            params[jss::account] = bob.human();
            auto resp = env.rpc("json", "account_objects", to_string(params));
            BEAST_EXPECT(!resp.isMember(jss::marker));
            BEAST_EXPECT(resp[jss::result][jss::account_objects].size() == 0);
 
            // Limit == 1
            params[jss::limit] = 1;
            resp = env.rpc("json", "account_objects", to_string(params));
            BEAST_EXPECT(!resp.isMember(jss::marker));
            BEAST_EXPECT(resp[jss::result][jss::account_objects].size() == 0);
        }
 
        // Check behavior if there are only NFTokens.
        env(token::mint(bob, 0u), txflags(tfTransferable));
        env.close();
 
        // test 'unstepped'
        // i.e. request account objects without explicit limit/marker paging
        Json::Value unpaged;
        {
            Json::Value params;
            params[jss::account] = bob.human();
            auto resp = env.rpc("json", "account_objects", to_string(params));
            BEAST_EXPECT(!resp.isMember(jss::marker));
 
            unpaged = resp[jss::result][jss::account_objects];
            BEAST_EXPECT(unpaged.size() == 1);
        }
        // test request with type parameter as filter, unstepped
        {
            Json::Value params;
            params[jss::account] = bob.human();
            params[jss::type] = jss::nft_page;
            auto resp = env.rpc("json", "account_objects", to_string(params));
            BEAST_EXPECT(!resp.isMember(jss::marker));
            Json::Value& aobjs = resp[jss::result][jss::account_objects];
            BEAST_EXPECT(aobjs.size() == 1);
            BEAST_EXPECT(aobjs[0u][sfLedgerEntryType.jsonName] == jss::NFTokenPage);
            BEAST_EXPECT(aobjs[0u][sfNFTokens.jsonName].size() == 1);
        }
        // test stepped one-at-a-time with limit=1, resume from prev marker
        {
            Json::Value params;
            params[jss::account] = bob.human();
            params[jss::limit] = 1;
 
            Json::Value resp = env.rpc("json", "account_objects", to_string(params));
            Json::Value& aobjs = resp[jss::result][jss::account_objects];
            BEAST_EXPECT(aobjs.size() == 1);
            auto& aobj = aobjs[0U];
            BEAST_EXPECT(!resp[jss::result].isMember(jss::limit));
            BEAST_EXPECT(!resp[jss::result].isMember(jss::marker));
 
            BEAST_EXPECT(aobj == unpaged[0u]);
        }
 
        // Add more objects in addition to the NFToken Page.
        env.trust(USD1(1000), bob);
        env.trust(USD2(1000), bob);
 
        env(pay(gw1, bob, USD1(1000)));
        env(pay(gw2, bob, USD2(1000)));
 
        env(offer(bob, XRP(100), bob["USD"](1)), txflags(tfPassive));
        env(offer(bob, XRP(100), USD1(1)), txflags(tfPassive));
        env.close();
 
        // test 'unstepped'
        {
            Json::Value params;
            params[jss::account] = bob.human();
            auto resp = env.rpc("json", "account_objects", to_string(params));
            BEAST_EXPECT(!resp.isMember(jss::marker));
 
            unpaged = resp[jss::result][jss::account_objects];
            BEAST_EXPECT(unpaged.size() == 5);
        }
        // test request with type parameter as filter, unstepped
        {
            Json::Value params;
            params[jss::account] = bob.human();
            params[jss::type] = jss::nft_page;
            auto resp = env.rpc("json", "account_objects", to_string(params));
            BEAST_EXPECT(!resp.isMember(jss::marker));
            Json::Value& aobjs = resp[jss::result][jss::account_objects];
            BEAST_EXPECT(aobjs.size() == 1);
            BEAST_EXPECT(aobjs[0u][sfLedgerEntryType.jsonName] == jss::NFTokenPage);
            BEAST_EXPECT(aobjs[0u][sfNFTokens.jsonName].size() == 1);
        }
        // test stepped one-at-a-time with limit=1, resume from prev marker
        {
            Json::Value params;
            params[jss::account] = bob.human();
            params[jss::limit] = 1;
            for (int i = 0; i < 5; ++i)
            {
                Json::Value resp = env.rpc("json", "account_objects", to_string(params));
                Json::Value& aobjs = resp[jss::result][jss::account_objects];
                BEAST_EXPECT(aobjs.size() == 1);
                auto& aobj = aobjs[0U];
                if (i < 4)
                {
                    BEAST_EXPECT(resp[jss::result][jss::limit] == 1);
                    BEAST_EXPECT(resp[jss::result].isMember(jss::marker));
                }
                else
                {
                    BEAST_EXPECT(!resp[jss::result].isMember(jss::limit));
                    BEAST_EXPECT(!resp[jss::result].isMember(jss::marker));
                }
 
                BEAST_EXPECT(aobj == unpaged[i]);
 
                params[jss::marker] = resp[jss::result][jss::marker];
            }
        }
 
        // Make sure things still work if there is more than 1 NFT Page.
        for (int i = 0; i < 32; ++i)
        {
            env(token::mint(bob, 0u), txflags(tfTransferable));
            env.close();
        }
        // test 'unstepped'
        {
            Json::Value params;
            params[jss::account] = bob.human();
            auto resp = env.rpc("json", "account_objects", to_string(params));
            BEAST_EXPECT(!resp.isMember(jss::marker));
 
            unpaged = resp[jss::result][jss::account_objects];
            BEAST_EXPECT(unpaged.size() == 6);
        }
        // test request with type parameter as filter, unstepped
        {
            Json::Value params;
            params[jss::account] = bob.human();
            params[jss::type] = jss::nft_page;
            auto resp = env.rpc("json", "account_objects", to_string(params));
            BEAST_EXPECT(!resp.isMember(jss::marker));
            Json::Value& aobjs = resp[jss::result][jss::account_objects];
            BEAST_EXPECT(aobjs.size() == 2);
        }
        // test stepped one-at-a-time with limit=1, resume from prev marker
        {
            Json::Value params;
            params[jss::account] = bob.human();
            params[jss::limit] = 1;
            for (int i = 0; i < 6; ++i)
            {
                Json::Value resp = env.rpc("json", "account_objects", to_string(params));
                Json::Value& aobjs = resp[jss::result][jss::account_objects];
                BEAST_EXPECT(aobjs.size() == 1);
                auto& aobj = aobjs[0U];
                if (i < 5)
                {
                    BEAST_EXPECT(resp[jss::result][jss::limit] == 1);
                    BEAST_EXPECT(resp[jss::result].isMember(jss::marker));
                }
                else
                {
                    BEAST_EXPECT(!resp[jss::result].isMember(jss::limit));
                    BEAST_EXPECT(!resp[jss::result].isMember(jss::marker));
                }
 
                BEAST_EXPECT(aobj == unpaged[i]);
 
                params[jss::marker] = resp[jss::result][jss::marker];
            }
        }
    }
 
    void
    testObjectTypes()
    {
        testcase("object types");
 
        // Give gw a bunch of ledger objects and make sure we can retrieve
        // them by type.
        using namespace jtx;
 
        Account const alice{"alice"};
        Account const gw{"gateway"};
        auto const USD = gw["USD"];
 
        auto const features = testable_amendments() | featureXChainBridge | featurePermissionedDomains;
        Env env(*this, features);
 
        // Make a lambda we can use to get "account_objects" easily.
        auto acctObjs = [&env](
                            AccountID const& acct,
                            std::optional<Json::StaticString> const& type,
                            std::optional<std::uint16_t> limit = std::nullopt,
                            std::optional<std::string> marker = std::nullopt) {
            Json::Value params;
            params[jss::account] = to_string(acct);
            if (type)
                params[jss::type] = *type;
            if (limit)
                params[jss::limit] = *limit;
            if (marker)
                params[jss::marker] = *marker;
            params[jss::ledger_index] = "validated";
            return env.rpc("json", "account_objects", to_string(params));
        };
 
        // Make a lambda that easily identifies the size of account objects.
        auto acctObjsIsSize = [](Json::Value const& resp, unsigned size) {
            return resp[jss::result][jss::account_objects].isArray() &&
                (resp[jss::result][jss::account_objects].size() == size);
        };
 
        // Make a lambda that checks if the response has error for invalid type
        auto acctObjsTypeIsInvalid = [](Json::Value const& resp) {
            return resp[jss::result].isMember(jss::error) &&
                resp[jss::result][jss::error_message] == "Invalid field \'type\'.";
        };
 
        env.fund(XRP(10000), gw, alice);
        env.close();
 
        // Since the account is empty now, all account objects should come
        // back empty.
        BEAST_EXPECT(acctObjsIsSize(acctObjs(gw, jss::account), 0));
        BEAST_EXPECT(acctObjsIsSize(acctObjs(gw, jss::check), 0));
        BEAST_EXPECT(acctObjsIsSize(acctObjs(gw, jss::deposit_preauth), 0));
        BEAST_EXPECT(acctObjsIsSize(acctObjs(gw, jss::escrow), 0));
        BEAST_EXPECT(acctObjsIsSize(acctObjs(gw, jss::nft_page), 0));
        BEAST_EXPECT(acctObjsIsSize(acctObjs(gw, jss::offer), 0));
        BEAST_EXPECT(acctObjsIsSize(acctObjs(gw, jss::payment_channel), 0));
        BEAST_EXPECT(acctObjsIsSize(acctObjs(gw, jss::signer_list), 0));
        BEAST_EXPECT(acctObjsIsSize(acctObjs(gw, jss::state), 0));
        BEAST_EXPECT(acctObjsIsSize(acctObjs(gw, jss::ticket), 0));
        BEAST_EXPECT(acctObjsIsSize(acctObjs(gw, jss::amm), 0));
        BEAST_EXPECT(acctObjsIsSize(acctObjs(gw, jss::did), 0));
        BEAST_EXPECT(acctObjsIsSize(acctObjs(gw, jss::permissioned_domain), 0));
 
        // we expect invalid field type reported for the following types
        BEAST_EXPECT(acctObjsTypeIsInvalid(acctObjs(gw, jss::amendments)));
        BEAST_EXPECT(acctObjsTypeIsInvalid(acctObjs(gw, jss::directory)));
        BEAST_EXPECT(acctObjsTypeIsInvalid(acctObjs(gw, jss::fee)));
        BEAST_EXPECT(acctObjsTypeIsInvalid(acctObjs(gw, jss::hashes)));
        BEAST_EXPECT(acctObjsTypeIsInvalid(acctObjs(gw, jss::NegativeUNL)));
 
        // gw mints an NFT so we can find it.
        uint256 const nftID{token::getNextID(env, gw, 0u, tfTransferable)};
        env(token::mint(gw, 0u), txflags(tfTransferable));
        env.close();
        {
            // Find the NFToken page and make sure it's the right one.
            Json::Value const resp = acctObjs(gw, jss::nft_page);
            BEAST_EXPECT(acctObjsIsSize(resp, 1));
 
            auto const& nftPage = resp[jss::result][jss::account_objects][0u];
            BEAST_EXPECT(nftPage[sfNFTokens.jsonName].size() == 1);
            BEAST_EXPECT(
                nftPage[sfNFTokens.jsonName][0u][sfNFToken.jsonName][sfNFTokenID.jsonName] == to_string(nftID));
        }
 
        // Set up a trust line so we can find it.
        env.trust(USD(1000), alice);
        env.close();
        env(pay(gw, alice, USD(5)));
        env.close();
        {
            // Find the trustline and make sure it's the right one.
            Json::Value const resp = acctObjs(gw, jss::state);
            BEAST_EXPECT(acctObjsIsSize(resp, 1));
 
            auto const& state = resp[jss::result][jss::account_objects][0u];
            BEAST_EXPECT(state[sfBalance.jsonName][jss::value].asInt() == -5);
            BEAST_EXPECT(state[sfHighLimit.jsonName][jss::value].asUInt() == 1000);
        }
        // gw writes a check for USD(10) to alice.
        env(check::create(gw, alice, USD(10)));
        env.close();
        {
            // Find the check.
            Json::Value const resp = acctObjs(gw, jss::check);
            BEAST_EXPECT(acctObjsIsSize(resp, 1));
 
            auto const& check = resp[jss::result][jss::account_objects][0u];
            BEAST_EXPECT(check[sfAccount.jsonName] == gw.human());
            BEAST_EXPECT(check[sfDestination.jsonName] == alice.human());
            BEAST_EXPECT(check[sfSendMax.jsonName][jss::value].asUInt() == 10);
        }
        // gw preauthorizes payments from alice.
        env(deposit::auth(gw, alice));
        env.close();
        {
            // Find the pre-authorization.
            Json::Value const resp = acctObjs(gw, jss::deposit_preauth);
            BEAST_EXPECT(acctObjsIsSize(resp, 1));
 
            auto const& preauth = resp[jss::result][jss::account_objects][0u];
            BEAST_EXPECT(preauth[sfAccount.jsonName] == gw.human());
            BEAST_EXPECT(preauth[sfAuthorize.jsonName] == alice.human());
        }
        {
            // gw creates an escrow that we can look for in the ledger.
            Json::Value jvEscrow;
            jvEscrow[jss::TransactionType] = jss::EscrowCreate;
            jvEscrow[jss::Account] = gw.human();
            jvEscrow[jss::Destination] = gw.human();
            jvEscrow[jss::Amount] = XRP(100).value().getJson(JsonOptions::none);
            jvEscrow[sfFinishAfter.jsonName] = env.now().time_since_epoch().count() + 1;
            env(jvEscrow);
            env.close();
        }
        {
            // Find the escrow.
            Json::Value const resp = acctObjs(gw, jss::escrow);
            BEAST_EXPECT(acctObjsIsSize(resp, 1));
 
            auto const& escrow = resp[jss::result][jss::account_objects][0u];
            BEAST_EXPECT(escrow[sfAccount.jsonName] == gw.human());
            BEAST_EXPECT(escrow[sfDestination.jsonName] == gw.human());
            BEAST_EXPECT(escrow[sfAmount.jsonName].asUInt() == 100'000'000);
        }
 
        {
            std::string const credentialType1 = "credential1";
            Account issuer("issuer");
            env.fund(XRP(5000), issuer);
 
            // gw creates an PermissionedDomain.
            env(pdomain::setTx(gw, {{issuer, credentialType1}}));
            env.close();
 
            // Find the PermissionedDomain.
            Json::Value const resp = acctObjs(gw, jss::permissioned_domain);
            BEAST_EXPECT(acctObjsIsSize(resp, 1));
 
            auto const& permissionedDomain = resp[jss::result][jss::account_objects][0u];
            BEAST_EXPECT(permissionedDomain.isMember(jss::Owner) && (permissionedDomain[jss::Owner] == gw.human()));
            bool const check1 = BEAST_EXPECT(
                permissionedDomain.isMember(jss::AcceptedCredentials) &&
                permissionedDomain[jss::AcceptedCredentials].isArray() &&
                (permissionedDomain[jss::AcceptedCredentials].size() == 1) &&
                (permissionedDomain[jss::AcceptedCredentials][0u].isMember(jss::Credential)));
 
            if (check1)
            {
                auto const& credential = permissionedDomain[jss::AcceptedCredentials][0u][jss::Credential];
                BEAST_EXPECT(
                    credential.isMember(sfIssuer.jsonName) && (credential[sfIssuer.jsonName] == issuer.human()));
                BEAST_EXPECT(
                    credential.isMember(sfCredentialType.jsonName) &&
                    (credential[sfCredentialType.jsonName] == strHex(credentialType1)));
            }
        }
 
        {
            // Create a bridge
            test::jtx::XChainBridgeObjects x;
            Env scEnv(*this, envconfig(), features);
            x.createScBridgeObjects(scEnv);
 
            auto scEnvAcctObjs = [&](Account const& acct, char const* type) {
                Json::Value params;
                params[jss::account] = acct.human();
                params[jss::type] = type;
                params[jss::ledger_index] = "validated";
                return scEnv.rpc("json", "account_objects", to_string(params));
            };
 
            Json::Value const resp = scEnvAcctObjs(Account::master, jss::bridge);
 
            BEAST_EXPECT(acctObjsIsSize(resp, 1));
            auto const& acct_bridge = resp[jss::result][jss::account_objects][0u];
            BEAST_EXPECT(acct_bridge[sfAccount.jsonName] == Account::master.human());
            BEAST_EXPECT(acct_bridge[sfLedgerEntryType.getJsonName()] == "Bridge");
            BEAST_EXPECT(acct_bridge[sfXChainClaimID.getJsonName()].asUInt() == 0);
            BEAST_EXPECT(acct_bridge[sfXChainAccountClaimCount.getJsonName()].asUInt() == 0);
            BEAST_EXPECT(acct_bridge[sfXChainAccountCreateCount.getJsonName()].asUInt() == 0);
            BEAST_EXPECT(acct_bridge[sfMinAccountCreateAmount.getJsonName()].asUInt() == 20000000);
            BEAST_EXPECT(acct_bridge[sfSignatureReward.getJsonName()].asUInt() == 1000000);
            BEAST_EXPECT(acct_bridge[sfXChainBridge.getJsonName()] == x.jvb);
        }
        {
            // Alice and Bob create a xchain sequence number that we can look
            // for in the ledger.
            test::jtx::XChainBridgeObjects x;
            Env scEnv(*this, envconfig(), features);
            x.createScBridgeObjects(scEnv);
 
            scEnv(xchain_create_claim_id(x.scAlice, x.jvb, x.reward, x.mcAlice));
            scEnv.close();
            scEnv(xchain_create_claim_id(x.scBob, x.jvb, x.reward, x.mcBob));
            scEnv.close();
 
            auto scEnvAcctObjs = [&](Account const& acct, char const* type) {
                Json::Value params;
                params[jss::account] = acct.human();
                params[jss::type] = type;
                params[jss::ledger_index] = "validated";
                return scEnv.rpc("json", "account_objects", to_string(params));
            };
 
            {
                // Find the xchain sequence number for Andrea.
                Json::Value const resp = scEnvAcctObjs(x.scAlice, jss::xchain_owned_claim_id);
                BEAST_EXPECT(acctObjsIsSize(resp, 1));
 
                auto const& xchain_seq = resp[jss::result][jss::account_objects][0u];
                BEAST_EXPECT(xchain_seq[sfAccount.jsonName] == x.scAlice.human());
                BEAST_EXPECT(xchain_seq[sfXChainClaimID.getJsonName()].asUInt() == 1);
            }
            {
                // and the one for Bob
                Json::Value const resp = scEnvAcctObjs(x.scBob, jss::xchain_owned_claim_id);
                BEAST_EXPECT(acctObjsIsSize(resp, 1));
 
                auto const& xchain_seq = resp[jss::result][jss::account_objects][0u];
                BEAST_EXPECT(xchain_seq[sfAccount.jsonName] == x.scBob.human());
                BEAST_EXPECT(xchain_seq[sfXChainClaimID.getJsonName()].asUInt() == 2);
            }
        }
        {
            test::jtx::XChainBridgeObjects x;
            Env scEnv(*this, envconfig(), features);
            x.createScBridgeObjects(scEnv);
            auto const amt = XRP(1000);
 
            // send first batch of account create attestations, so the
            // xchain_create_account_claim_id should be present on the door
            // account (Account::master) to collect the signatures until a
            // quorum is reached
            scEnv(test::jtx::create_account_attestation(
                x.scAttester, x.jvb, x.mcCarol, amt, x.reward, x.payees[0], true, 1, x.scuAlice, x.signers[0]));
            scEnv.close();
 
            auto scEnvAcctObjs = [&](Account const& acct, char const* type) {
                Json::Value params;
                params[jss::account] = acct.human();
                params[jss::type] = type;
                params[jss::ledger_index] = "validated";
                return scEnv.rpc("json", "account_objects", to_string(params));
            };
 
            {
                // Find the xchain_create_account_claim_id
                Json::Value const resp = scEnvAcctObjs(Account::master, jss::xchain_owned_create_account_claim_id);
                BEAST_EXPECT(acctObjsIsSize(resp, 1));
 
                auto const& xchain_create_account_claim_id = resp[jss::result][jss::account_objects][0u];
                BEAST_EXPECT(xchain_create_account_claim_id[sfAccount.jsonName] == Account::master.human());
                BEAST_EXPECT(xchain_create_account_claim_id[sfXChainAccountCreateCount.getJsonName()].asUInt() == 1);
            }
        }
 
        // gw creates an offer that we can look for in the ledger.
        env(offer(gw, USD(7), XRP(14)));
        env.close();
        {
            // Find the offer.
            Json::Value const resp = acctObjs(gw, jss::offer);
            BEAST_EXPECT(acctObjsIsSize(resp, 1));
 
            auto const& offer = resp[jss::result][jss::account_objects][0u];
            BEAST_EXPECT(offer[sfAccount.jsonName] == gw.human());
            BEAST_EXPECT(offer[sfTakerGets.jsonName].asUInt() == 14'000'000);
            BEAST_EXPECT(offer[sfTakerPays.jsonName][jss::value].asUInt() == 7);
        }
        {
            // Create a payment channel from qw to alice that we can look
            // for.
            Json::Value jvPayChan;
            jvPayChan[jss::TransactionType] = jss::PaymentChannelCreate;
            jvPayChan[jss::Account] = gw.human();
            jvPayChan[jss::Destination] = alice.human();
            jvPayChan[jss::Amount] = XRP(300).value().getJson(JsonOptions::none);
            jvPayChan[sfSettleDelay.jsonName] = 24 * 60 * 60;
            jvPayChan[sfPublicKey.jsonName] = strHex(gw.pk().slice());
            env(jvPayChan);
            env.close();
        }
        {
            // Find the payment channel.
            Json::Value const resp = acctObjs(gw, jss::payment_channel);
            BEAST_EXPECT(acctObjsIsSize(resp, 1));
 
            auto const& payChan = resp[jss::result][jss::account_objects][0u];
            BEAST_EXPECT(payChan[sfAccount.jsonName] == gw.human());
            BEAST_EXPECT(payChan[sfAmount.jsonName].asUInt() == 300'000'000);
            BEAST_EXPECT(payChan[sfSettleDelay.jsonName].asUInt() == 24 * 60 * 60);
        }
 
        {
            // gw creates a DID that we can look for in the ledger.
            Json::Value jvDID;
            jvDID[jss::TransactionType] = jss::DIDSet;
            jvDID[jss::Account] = gw.human();
            jvDID[sfURI.jsonName] = strHex(std::string{"uri"});
            env(jvDID);
            env.close();
        }
        {
            // Find the DID.
            Json::Value const resp = acctObjs(gw, jss::did);
            BEAST_EXPECT(acctObjsIsSize(resp, 1));
 
            auto const& did = resp[jss::result][jss::account_objects][0u];
            BEAST_EXPECT(did[sfAccount.jsonName] == gw.human());
            BEAST_EXPECT(did[sfURI.jsonName] == strHex(std::string{"uri"}));
        }
        // Make gw multisigning by adding a signerList.
        env(jtx::signers(gw, 6, {{alice, 7}}));
        env.close();
        {
            // Find the signer list.
            Json::Value const resp = acctObjs(gw, jss::signer_list);
            BEAST_EXPECT(acctObjsIsSize(resp, 1));
 
            auto const& signerList = resp[jss::result][jss::account_objects][0u];
            BEAST_EXPECT(signerList[sfSignerQuorum.jsonName] == 6);
            auto const& entry = signerList[sfSignerEntries.jsonName][0u][sfSignerEntry.jsonName];
            BEAST_EXPECT(entry[sfAccount.jsonName] == alice.human());
            BEAST_EXPECT(entry[sfSignerWeight.jsonName].asUInt() == 7);
        }
 
        {
            auto const seq = env.seq(gw);
            // Create a Ticket for gw.
            env(ticket::create(gw, 1));
            env.close();
 
            // Find the ticket.
            Json::Value const resp = acctObjs(gw, jss::ticket);
            BEAST_EXPECT(acctObjsIsSize(resp, 1));
 
            auto const& ticket = resp[jss::result][jss::account_objects][0u];
            BEAST_EXPECT(ticket[sfAccount.jsonName] == gw.human());
            BEAST_EXPECT(ticket[sfLedgerEntryType.jsonName] == jss::Ticket);
            BEAST_EXPECT(ticket[sfTicketSequence.jsonName].asUInt() == seq + 1);
        }
 
        {
            // See how "deletion_blockers_only" handles gw's directory.
            Json::Value params;
            params[jss::account] = gw.human();
            params[jss::deletion_blockers_only] = true;
            auto resp = env.rpc("json", "account_objects", to_string(params));
 
            std::vector<std::string> const expectedLedgerTypes = [] {
                std::vector<std::string> v{
                    jss::Escrow.c_str(),
                    jss::Check.c_str(),
                    jss::NFTokenPage.c_str(),
                    jss::RippleState.c_str(),
                    jss::PayChannel.c_str(),
                    jss::PermissionedDomain.c_str()};
                std::sort(v.begin(), v.end());
                return v;
            }();
 
            std::uint32_t const expectedAccountObjects{static_cast<std::uint32_t>(std::size(expectedLedgerTypes))};
 
            if (BEAST_EXPECT(acctObjsIsSize(resp, expectedAccountObjects)))
            {
                auto const& aobjs = resp[jss::result][jss::account_objects];
                std::vector<std::string> gotLedgerTypes;
                gotLedgerTypes.reserve(expectedAccountObjects);
                for (std::uint32_t i = 0; i < expectedAccountObjects; ++i)
                {
                    gotLedgerTypes.push_back(aobjs[i]["LedgerEntryType"].asString());
                }
                std::sort(gotLedgerTypes.begin(), gotLedgerTypes.end());
                BEAST_EXPECT(gotLedgerTypes == expectedLedgerTypes);
            }
        }
        {
            // See how "deletion_blockers_only" with `type` handles gw's
            // directory.
            Json::Value params;
            params[jss::account] = gw.human();
            params[jss::deletion_blockers_only] = true;
            params[jss::type] = jss::escrow;
            auto resp = env.rpc("json", "account_objects", to_string(params));
 
            if (BEAST_EXPECT(acctObjsIsSize(resp, 1u)))
            {
                auto const& aobjs = resp[jss::result][jss::account_objects];
                BEAST_EXPECT(aobjs[0u]["LedgerEntryType"] == jss::Escrow);
            }
        }
        {
            // Make a lambda to get the types
            auto getTypes = [&](Json::Value const& resp, std::vector<std::string>& typesOut) {
                auto const objs = resp[jss::result][jss::account_objects];
                for (auto const& obj : resp[jss::result][jss::account_objects])
                    typesOut.push_back(obj[sfLedgerEntryType.fieldName].asString());
                std::sort(typesOut.begin(), typesOut.end());
            };
            // Make a lambda we can use to check the number of fetched
            // account objects and their ledger type
            auto expectObjects = [&](Json::Value const& resp, std::vector<std::string> const& types) -> bool {
                if (!acctObjsIsSize(resp, types.size()))
                    return false;
                std::vector<std::string> typesOut;
                getTypes(resp, typesOut);
                return types == typesOut;
            };
            // Find AMM objects
            AMM amm(env, gw, XRP(1'000), USD(1'000));
            amm.deposit(alice, USD(1));
            // AMM account has 4 objects: AMM object and 3 trustlines
            auto const lines = getAccountLines(env, amm.ammAccount());
            BEAST_EXPECT(lines[jss::lines].size() == 3);
            // request AMM only, doesn't depend on the limit
            BEAST_EXPECT(acctObjsIsSize(acctObjs(amm.ammAccount(), jss::amm), 1));
            // request first two objects
            auto resp = acctObjs(amm.ammAccount(), std::nullopt, 2);
            std::vector<std::string> typesOut;
            getTypes(resp, typesOut);
            // request next two objects
            resp = acctObjs(amm.ammAccount(), std::nullopt, 10, resp[jss::result][jss::marker].asString());
            getTypes(resp, typesOut);
            BEAST_EXPECT(
                (typesOut ==
                 std::vector<std::string>{
                     jss::AMM.c_str(), jss::RippleState.c_str(), jss::RippleState.c_str(), jss::RippleState.c_str()}));
            // filter by state: there are three trustlines
            resp = acctObjs(amm.ammAccount(), jss::state, 10);
            BEAST_EXPECT(
                expectObjects(resp, {jss::RippleState.c_str(), jss::RippleState.c_str(), jss::RippleState.c_str()}));
            // AMM account doesn't own offers
            BEAST_EXPECT(acctObjsIsSize(acctObjs(amm.ammAccount(), jss::offer), 0));
            // gw account doesn't own AMM object
            BEAST_EXPECT(acctObjsIsSize(acctObjs(gw, jss::amm), 0));
        }
 
        // we still expect invalid field type reported for the following types
        BEAST_EXPECT(acctObjsTypeIsInvalid(acctObjs(gw, jss::amendments)));
        BEAST_EXPECT(acctObjsTypeIsInvalid(acctObjs(gw, jss::directory)));
        BEAST_EXPECT(acctObjsTypeIsInvalid(acctObjs(gw, jss::fee)));
        BEAST_EXPECT(acctObjsTypeIsInvalid(acctObjs(gw, jss::hashes)));
        BEAST_EXPECT(acctObjsTypeIsInvalid(acctObjs(gw, jss::NegativeUNL)));
 
        // Run up the number of directory entries so gw has two
        // directory nodes.
        for (int d = 1'000'032; d >= 1'000'000; --d)
        {
            env(offer(gw, USD(1), drops(d)));
            env.close();
        }
 
        // Verify that the non-returning types still don't return anything.
        BEAST_EXPECT(acctObjsIsSize(acctObjs(gw, jss::account), 0));
    }
 
    void
    testNFTsMarker()
    {
        // there's some bug found in account_nfts method that it did not
        // return invalid params when providing unassociated nft marker.
        // this test tests both situations when providing valid nft marker
        // and unassociated nft marker.
        testcase("NFTsMarker");
 
        using namespace jtx;
        Env env(*this);
 
        Account const bob{"bob"};
        env.fund(XRP(10000), bob);
 
        static constexpr unsigned nftsSize = 10;
        for (unsigned i = 0; i < nftsSize; i++)
        {
            env(token::mint(bob, 0));
        }
 
        env.close();
 
        // save the NFTokenIDs to use later
        std::vector<Json::Value> tokenIDs;
        {
            Json::Value params;
            params[jss::account] = bob.human();
            params[jss::ledger_index] = "validated";
            Json::Value const resp = env.rpc("json", "account_nfts", to_string(params));
            Json::Value const& nfts = resp[jss::result][jss::account_nfts];
            for (Json::Value const& nft : nfts)
                tokenIDs.push_back(nft["NFTokenID"]);
        }
 
        // this lambda function is used to check if the account_nfts method
        // returns the correct token information. lastIndex is used to query the
        // last marker.
        auto compareNFTs = [&tokenIDs, &env, &bob](unsigned const limit, unsigned const lastIndex) {
            Json::Value params;
            params[jss::account] = bob.human();
            params[jss::limit] = limit;
            params[jss::marker] = tokenIDs[lastIndex];
            params[jss::ledger_index] = "validated";
            Json::Value const resp = env.rpc("json", "account_nfts", to_string(params));
 
            if (resp[jss::result].isMember(jss::error))
                return false;
 
            Json::Value const& nfts = resp[jss::result][jss::account_nfts];
            unsigned const nftsCount =
                tokenIDs.size() - lastIndex - 1 < limit ? tokenIDs.size() - lastIndex - 1 : limit;
 
            if (nfts.size() != nftsCount)
                return false;
 
            for (unsigned i = 0; i < nftsCount; i++)
            {
                if (nfts[i]["NFTokenID"] != tokenIDs[lastIndex + 1 + i])
                    return false;
            }
 
            return true;
        };
 
        // test a valid marker which is equal to the third tokenID
        BEAST_EXPECT(compareNFTs(4, 2));
 
        // test a valid marker which is equal to the 8th tokenID
        BEAST_EXPECT(compareNFTs(4, 7));
 
        // lambda that holds common code for invalid cases.
        auto testInvalidMarker = [&env, &bob](auto marker, char const* errorMessage) {
            Json::Value params;
            params[jss::account] = bob.human();
            params[jss::limit] = 4;
            params[jss::ledger_index] = jss::validated;
            params[jss::marker] = marker;
            Json::Value const resp = env.rpc("json", "account_nfts", to_string(params));
            return resp[jss::result][jss::error_message] == errorMessage;
        };
 
        // test an invalid marker that is not a string
        BEAST_EXPECT(testInvalidMarker(17, "Invalid field \'marker\', not string."));
 
        // test an invalid marker that has a non-hex character
        BEAST_EXPECT(testInvalidMarker(
            "00000000F51DFC2A09D62CBBA1DFBDD4691DAC96AD98B900000000000000000G", "Invalid field \'marker\'."));
 
        // this lambda function is used to create some fake marker using given
        // taxon and sequence because we want to test some unassociated markers
        // later
        auto createFakeNFTMarker = [](AccountID const& issuer,
                                      std::uint32_t taxon,
                                      std::uint32_t tokenSeq,
                                      std::uint16_t flags = 0,
                                      std::uint16_t fee = 0) {
            // the marker has the exact same format as an NFTokenID
            return to_string(NFTokenMint::createNFTokenID(flags, fee, issuer, nft::toTaxon(taxon), tokenSeq));
        };
 
        // test an unassociated marker which does not exist in the NFTokenIDs
        BEAST_EXPECT(
            testInvalidMarker(createFakeNFTMarker(bob.id(), 0x000000000, 0x00000000), "Invalid field \'marker\'."));
 
        // test an unassociated marker which exceeds the maximum value of the
        // existing NFTokenID
        BEAST_EXPECT(
            testInvalidMarker(createFakeNFTMarker(bob.id(), 0xFFFFFFFF, 0xFFFFFFFF), "Invalid field \'marker\'."));
    }
 
    void
    testAccountNFTs()
    {
        testcase("account_nfts");
 
        using namespace jtx;
        Env env(*this);
 
        // test validation
        {
            auto testInvalidAccountParam = [&](auto const& param) {
                Json::Value params;
                params[jss::account] = param;
                auto jrr = env.rpc("json", "account_nfts", to_string(params))[jss::result];
                BEAST_EXPECT(jrr[jss::error] == "invalidParams");
                BEAST_EXPECT(jrr[jss::error_message] == "Invalid field 'account'.");
            };
 
            testInvalidAccountParam(1);
            testInvalidAccountParam(1.1);
            testInvalidAccountParam(true);
            testInvalidAccountParam(Json::Value(Json::nullValue));
            testInvalidAccountParam(Json::Value(Json::objectValue));
            testInvalidAccountParam(Json::Value(Json::arrayValue));
        }
    }
 
    void
    testAccountObjectMarker()
    {
        testcase("AccountObjectMarker");
 
        using namespace jtx;
        Env env(*this);
 
        Account const alice{"alice"};
        Account const bob{"bob"};
        Account const carol{"carol"};
        env.fund(XRP(10000), alice, bob, carol);
 
        unsigned const accountObjectSize = 30;
        for (unsigned i = 0; i < accountObjectSize; i++)
            env(check::create(alice, bob, XRP(10)));
 
        for (unsigned i = 0; i < 10; i++)
            env(token::mint(carol, 0));
 
        env.close();
 
        unsigned const limit = 11;
        Json::Value marker;
 
        // test account_objects with a limit and update marker
        {
            Json::Value params;
            params[jss::account] = bob.human();
            params[jss::limit] = limit;
            params[jss::ledger_index] = "validated";
            auto resp = env.rpc("json", "account_objects", to_string(params));
            auto& accountObjects = resp[jss::result][jss::account_objects];
            marker = resp[jss::result][jss::marker];
            BEAST_EXPECT(!resp[jss::result].isMember(jss::error));
            BEAST_EXPECT(accountObjects.size() == limit);
        }
 
        // test account_objects with valid marker and update marker
        {
            Json::Value params;
            params[jss::account] = bob.human();
            params[jss::limit] = limit;
            params[jss::marker] = marker;
            params[jss::ledger_index] = "validated";
            auto resp = env.rpc("json", "account_objects", to_string(params));
            auto& accountObjects = resp[jss::result][jss::account_objects];
            marker = resp[jss::result][jss::marker];
            BEAST_EXPECT(!resp[jss::result].isMember(jss::error));
            BEAST_EXPECT(accountObjects.size() == limit);
        }
 
        // this lambda function is used to check invalid marker response.
        auto testInvalidMarker = [&](std::string& marker) {
            Json::Value params;
            params[jss::account] = bob.human();
            params[jss::limit] = limit;
            params[jss::ledger_index] = jss::validated;
            params[jss::marker] = marker;
            Json::Value const resp = env.rpc("json", "account_objects", to_string(params));
            return resp[jss::result][jss::error_message] == "Invalid field \'marker\'.";
        };
 
        auto const markerStr = marker.asString();
        auto const& idx = markerStr.find(',');
        auto const dirIndex = markerStr.substr(0, idx);
        auto const entryIndex = markerStr.substr(idx + 1);
 
        // test account_objects with an invalid marker that contains no ','
        {
            std::string s = dirIndex + entryIndex;
            BEAST_EXPECT(testInvalidMarker(s));
        }
 
        // test invalid marker by adding invalid string after the maker:
        // "dirIndex,entryIndex,1234"
        {
            std::string s = markerStr + ",1234";
            BEAST_EXPECT(testInvalidMarker(s));
        }
 
        // test account_objects with an invalid marker containing invalid
        // dirIndex by replacing some characters from the dirIndex.
        {
            std::string s = markerStr;
            s.replace(0, 7, "FFFFFFF");
            BEAST_EXPECT(testInvalidMarker(s));
        }
 
        // test account_objects with an invalid marker containing invalid
        // entryIndex by replacing some characters from the entryIndex.
        {
            std::string s = entryIndex;
            s.replace(0, 7, "FFFFFFF");
            s = dirIndex + ',' + s;
            BEAST_EXPECT(testInvalidMarker(s));
        }
 
        // test account_objects with an invalid marker containing invalid
        // dirIndex with marker: ",entryIndex"
        {
            std::string s = ',' + entryIndex;
            BEAST_EXPECT(testInvalidMarker(s));
        }
 
        // test account_objects with marker: "0,entryIndex", this is still
        // valid, because when dirIndex = 0, we will use root key to find
        // dir.
        {
            std::string s = "0," + entryIndex;
            Json::Value params;
            params[jss::account] = bob.human();
            params[jss::limit] = limit;
            params[jss::marker] = s;
            params[jss::ledger_index] = "validated";
            auto resp = env.rpc("json", "account_objects", to_string(params));
            auto& accountObjects = resp[jss::result][jss::account_objects];
            BEAST_EXPECT(!resp[jss::result].isMember(jss::error));
            BEAST_EXPECT(accountObjects.size() == limit);
        }
 
        // test account_objects with an invalid marker containing invalid
        // entryIndex with marker: "dirIndex,"
        {
            std::string s = dirIndex + ',';
            BEAST_EXPECT(testInvalidMarker(s));
        }
 
        // test account_objects with an invalid marker containing invalid
        // entryIndex with marker: "dirIndex,0"
        {
            std::string s = dirIndex + ",0";
            BEAST_EXPECT(testInvalidMarker(s));
        }
 
        // continue getting account_objects with valid marker. This will be the
        // last page, so response will not contain any marker.
        {
            Json::Value params;
            params[jss::account] = bob.human();
            params[jss::limit] = limit;
            params[jss::marker] = marker;
            params[jss::ledger_index] = "validated";
            auto resp = env.rpc("json", "account_objects", to_string(params));
            auto& accountObjects = resp[jss::result][jss::account_objects];
            BEAST_EXPECT(!resp[jss::result].isMember(jss::error));
            BEAST_EXPECT(accountObjects.size() == accountObjectSize - limit * 2);
            BEAST_EXPECT(!resp[jss::result].isMember(jss::marker));
        }
 
        // test account_objects when the account only have nft pages, but
        // provided invalid entry index.
        {
            Json::Value params;
            params[jss::account] = carol.human();
            params[jss::limit] = 10;
            params[jss::marker] = "0," + entryIndex;
            params[jss::ledger_index] = "validated";
            auto resp = env.rpc("json", "account_objects", to_string(params));
            auto& accountObjects = resp[jss::result][jss::account_objects];
            BEAST_EXPECT(accountObjects.size() == 0);
        }
    }
 
    void
    run() override
    {
        testErrors();
        testUnsteppedThenStepped();
        testUnsteppedThenSteppedWithNFTs();
        testObjectTypes();
        testNFTsMarker();
        testAccountNFTs();
        testAccountObjectMarker();
    }
};
 
BEAST_DEFINE_TESTSUITE(AccountObjects, rpc, xrpl);
 
}  // namespace test
}  // namespace xrpl