////////////////////////////////////////////////////////////////////////////////
/// @brief test case for RemoveFollower job
///
/// @file
///
/// DISCLAIMER
///
/// Copyright 2017 ArangoDB GmbH, Cologne, Germany
///
/// Licensed under the Apache License, Version 2.0 (the "License");
/// you may not use this file except in compliance with the License.
/// You may obtain a copy of the License at
///
///     http://www.apache.org/licenses/LICENSE-2.0
///
/// Unless required by applicable law or agreed to in writing, software
/// distributed under the License is distributed on an "AS IS" BASIS,
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
/// See the License for the specific language governing permissions and
/// limitations under the License.
///
/// Copyright holder is ArangoDB GmbH, Cologne, Germany
///
/// @author Kaveh Vahedipour
/// @author Copyright 2017, ArangoDB GmbH, Cologne, Germany
////////////////////////////////////////////////////////////////////////////////
#include "catch.hpp"
#include "fakeit.hpp"

#include "Agency/RemoveFollower.h"
#include "Agency/FailedLeader.h"
#include "Agency/MoveShard.h"
#include "Agency/AgentInterface.h"
#include "Agency/Node.h"
#include "lib/Basics/StringUtils.h"
#include "lib/Random/RandomGenerator.h"
#include <iostream>
#include <velocypack/Parser.h>
#include <velocypack/Slice.h>
#include <velocypack/velocypack-aliases.h>

using namespace arangodb;
using namespace arangodb::basics;
using namespace arangodb::consensus;
using namespace fakeit;

namespace arangodb {
namespace tests {
namespace remove_follower_test {

const std::string PREFIX = "arango";
const std::string DATABASE = "database";
const std::string COLLECTION = "collection1";
const std::string CLONE = "collection2";
const std::string SHARD = "s1";
const std::string SHARD_LEADER = "leader";
const std::string SHARD_FOLLOWER1 = "follower1";
const std::string SHARD_FOLLOWER2 = "follower2";
const std::string FREE_SERVER = "free";
const std::string FREE_SERVER2 = "free2";

bool aborts = false;

const char *agency =
#include "RemoveFollowerTest.json"
  ;
std::string const agencyLarge =
#include "RemoveFollowerTestLarge.json"
;
const char *todo =
#include "RemoveFollowerTestToDo.json"
  ;


Node createNodeFromBuilder(Builder const& builder) {

  Builder opBuilder;
  { VPackObjectBuilder a(&opBuilder);
    opBuilder.add("new", builder.slice()); }  
  Node node("");
  node.handle<SET>(opBuilder.slice());
  return node;

}

Builder createBuilder(char const* c) {

  Options options;
  options.checkAttributeUniqueness = true;
  VPackParser parser(&options);
  parser.parse(c);
  
  Builder builder;
  builder.add(parser.steal()->slice());
  return builder;
  
}

Node createNode(char const* c) {
  return createNodeFromBuilder(createBuilder(c));
}

Node createRootNode() {
  return createNode(agency);
}

typedef std::function<std::unique_ptr<Builder>(
  Slice const&, std::string const&)> TestStructType;

inline static std::string typeName (Slice const& slice) {
  return std::string(slice.typeName());
}

TEST_CASE("RemoveFollower", "[agency][supervision]") {

  GIVEN("An agency with 5 DBservers") {

    auto baseStructure = createRootNode();
    arangodb::RandomGenerator::initialize(arangodb::RandomGenerator::RandomType::MERSENNE);

    Builder builder;
    baseStructure.toBuilder(builder);

    std::string jobId = "1";

    write_ret_t fakeWriteResult{true, "", std::vector<apply_ret_t> {APPLIED}, std::vector<index_t> {1}};
    trans_ret_t fakeTransResult{true, "", 1, 0, std::make_shared<Builder>()};

    SECTION("creating a job should create a job in todo") {
      Mock<AgentInterface> mockAgent;

      When(Method(mockAgent, write)).AlwaysDo(
        [&](query_t const &q, consensus::AgentInterface::WriteMode w) -> write_ret_t {
          INFO(q->slice().toJson());
          auto expectedJobKey = "/arango/Target/ToDo/" + jobId;
          REQUIRE(typeName(q->slice()) == "array");
          REQUIRE(q->slice().length() == 1);
          REQUIRE(typeName(q->slice()[0]) == "array");
          REQUIRE(q->slice()[0].length() == 1); // we always simply override! no preconditions...
          REQUIRE(typeName(q->slice()[0][0]) == "object");
          REQUIRE(q->slice()[0][0].length() == 1); // should ONLY do an entry in todo
          REQUIRE(typeName(q->slice()[0][0].get(expectedJobKey)) == "object");

          auto job = q->slice()[0][0].get(expectedJobKey);
          REQUIRE(typeName(job.get("creator")) == "string");
          REQUIRE(typeName(job.get("type")) == "string");
          CHECK(job.get("type").copyString() == "removeFollower");
          REQUIRE(typeName(job.get("database")) == "string");
          CHECK(job.get("database").copyString() == DATABASE);
          REQUIRE(typeName(job.get("collection")) == "string");
          CHECK(job.get("collection").copyString() == COLLECTION);
          REQUIRE(typeName(job.get("shard")) == "string");
          CHECK(job.get("shard").copyString() == SHARD);
          CHECK(typeName(job.get("jobId")) == "string");
          CHECK(typeName(job.get("timeCreated")) == "string");

          return fakeWriteResult;
        }
      );

      When(Method(mockAgent, waitFor)).AlwaysReturn(AgentInterface::raft_commit_t::OK);
      auto &agent = mockAgent.get();
      auto removeFollower = RemoveFollower(
        baseStructure, &agent, jobId, "unittest", DATABASE, COLLECTION, SHARD
      );

      removeFollower.create();

    }

    SECTION("<collection> still exists, if missing, job is finished, move to "
      "Target/Finished") {

      TestStructType createTestStructure = [&](
        Slice const &s, std::string const &path
      ) {

        std::unique_ptr<Builder> builder;
        if (path == "/arango/Plan/Collections/" + DATABASE + "/" + COLLECTION) {
          return builder;
        }
        builder = std::make_unique<Builder>();

        if (s.isObject()) {
          VPackObjectBuilder b(builder.get());
          for (auto const &it: VPackObjectIterator(s)) {
            auto childBuilder = createTestStructure(it.value, path + "/" + it.key.copyString());
            if (childBuilder) {
              builder->add(it.key.copyString(), childBuilder->slice());
            }
          }
          if (path == "/arango/Target/ToDo") {
            builder->add(jobId, createBuilder(todo).slice());
          }
          builder->close();
        } else {
          builder->add(s);
        }

        return builder;
      };

      auto builder = createTestStructure(baseStructure.toBuilder().slice(), "");
      REQUIRE(builder);
      Node agency = createNodeFromBuilder(*builder);

      Mock<AgentInterface> mockAgent;
      When(Method(mockAgent, write)).AlwaysDo(
        [&](query_t const &q, consensus::AgentInterface::WriteMode w) -> write_ret_t {
          INFO(q->slice().toJson());
          REQUIRE(typeName(q->slice()) == "array");
          REQUIRE(q->slice().length() == 1);
          REQUIRE(typeName(q->slice()[0]) == "array");
          // we always simply override! no preconditions...
          REQUIRE(q->slice()[0].length() == 1);
          REQUIRE(typeName(q->slice()[0][0]) == "object");

          auto writes = q->slice()[0][0];
          REQUIRE(typeName(writes.get("/arango/Target/ToDo/1")) == "object");
          REQUIRE(typeName(writes.get("/arango/Target/ToDo/1").get("op")) == "string");
          CHECK(writes.get("/arango/Target/ToDo/1").get("op").copyString() == "delete");
          CHECK(typeName(writes.get("/arango/Target/Finished/1")) == "object");
          return fakeWriteResult;
        }
      );

      When(Method(mockAgent, waitFor)).AlwaysReturn(AgentInterface::raft_commit_t::OK);
      auto &agent = mockAgent.get();
      RemoveFollower(agency("arango"), &agent, JOB_STATUS::TODO, jobId).start(aborts);

    }


    SECTION("if <collection> has a non-empty distributeShardsLike attribute, the "
      "job immediately fails and is moved to Target/Failed") {

      TestStructType createTestStructure = [&](
        Slice const &s, std::string const &path
      ) {

        std::unique_ptr<Builder> builder = std::make_unique<Builder>();
        if (s.isObject()) {
          VPackObjectBuilder b(builder.get());
          for (auto const &it: VPackObjectIterator(s)) {
            auto childBuilder =
              createTestStructure(it.value, path + "/" + it.key.copyString());
            if (childBuilder) {
              builder->add(it.key.copyString(), childBuilder->slice());
            }
          }
          if (path == "/arango/Plan/Collections/" + DATABASE + "/" + COLLECTION) {
            builder->add("distributeShardsLike", VPackValue("PENG"));
          }
          if (path == "/arango/Target/ToDo") {
            builder->add(jobId, createBuilder(todo).slice());
          }
        } else {
          builder->add(s);
        }
        return builder;

      };

      auto builder = createTestStructure(baseStructure.toBuilder().slice(), "");
      REQUIRE(builder);
      auto agency = createNodeFromBuilder(*builder);

      Mock<AgentInterface> mockAgent;
      When(Method(mockAgent, write)).AlwaysDo(
        [&](query_t const &q, consensus::AgentInterface::WriteMode w) -> write_ret_t {
          INFO(q->slice().toJson());
          REQUIRE(typeName(q->slice()) == "array");
          REQUIRE(q->slice().length() == 1);
          REQUIRE(typeName(q->slice()[0]) == "array");
          REQUIRE(q->slice()[0].length() == 1); // we always simply override! no preconditions...
          REQUIRE(typeName(q->slice()[0][0]) == "object");

          auto writes = q->slice()[0][0];
          REQUIRE(typeName(writes.get("/arango/Target/ToDo/1")) == "object");
          REQUIRE(typeName(writes.get("/arango/Target/ToDo/1").get("op")) == "string");
          CHECK(writes.get("/arango/Target/ToDo/1").get("op").copyString() == "delete");
          CHECK(typeName(writes.get("/arango/Target/Failed/1")) == "object");
          return fakeWriteResult;
        }
      );
      When(Method(mockAgent, waitFor)).AlwaysReturn(AgentInterface::raft_commit_t::OK);
      auto &agent = mockAgent.get();
      RemoveFollower(agency("arango"), &agent, JOB_STATUS::TODO, jobId).start(aborts);

    }

    SECTION("condition (*) still holds for the mentioned collections, if not, "
      "job is finished, move to Target/Finished.") {

      TestStructType createTestStructure = [&](
        Slice const &s, std::string const &path
      ) {

        std::unique_ptr<Builder> builder = std::make_unique<Builder>();
        if (s.isObject()) {
          VPackObjectBuilder b(builder.get());
          for (auto const &it: VPackObjectIterator(s)) {
            auto childBuilder =
              createTestStructure(it.value, path + "/" + it.key.copyString());
            if (childBuilder) {
              builder->add(it.key.copyString(), childBuilder->slice());
            }
          }
          if (path == "/arango/Target/ToDo") {
            builder->add(jobId, createBuilder(todo).slice());
          }
        } else {
          if (path == "/arango/Plan/Collections/" + DATABASE + "/" +
                      COLLECTION + "/shards/" + SHARD) {
            VPackArrayBuilder a(builder.get());
            for (auto const &serv : VPackArrayIterator(s)) {
              if (serv.copyString() != SHARD_FOLLOWER1
                  && serv.copyString() != SHARD_FOLLOWER2) {
                builder->add(serv);
              }
            }
          } else {
            builder->add(s);
          }
        }
        return builder;

      };

      auto builder = createTestStructure(baseStructure.toBuilder().slice(), "");
      REQUIRE(builder);
      auto agency = createNodeFromBuilder(*builder);

      Mock<AgentInterface> mockAgent;
      When(Method(mockAgent, write)).AlwaysDo(
        [&](query_t const &q, consensus::AgentInterface::WriteMode w) -> write_ret_t {
          INFO(q->slice().toJson());
          REQUIRE(typeName(q->slice()) == "array");
          REQUIRE(q->slice().length() == 1);
          REQUIRE(typeName(q->slice()[0]) == "array");
          REQUIRE(q->slice()[0].length() == 1); // we always simply override! no preconditions...
          REQUIRE(typeName(q->slice()[0][0]) == "object");

          auto writes = q->slice()[0][0];
          REQUIRE(typeName(writes.get("/arango/Target/ToDo/1")) == "object");
          REQUIRE(typeName(writes.get("/arango/Target/ToDo/1").get("op")) == "string");
          CHECK(writes.get("/arango/Target/ToDo/1").get("op").copyString() == "delete");
          CHECK(typeName(writes.get("/arango/Target/Finished/1")) == "object");
          return fakeWriteResult;
        }
      );
      When(Method(mockAgent, waitFor)).AlwaysReturn(AgentInterface::raft_commit_t::OK);
      auto &agent = mockAgent.get();
      RemoveFollower(agency("arango"), &agent, JOB_STATUS::TODO, jobId).start(aborts);

    }

    SECTION("compute the list allShards of collection/shard pairs that "
      "correspond to / because of distributeShardsLike attributes with "
      "value , include / as the first pair") {

      TestStructType createTestStructure = [&](
        Slice const &s, std::string const &path
      ) {

        std::unique_ptr<Builder> builder = std::make_unique<Builder>();
        if (s.isObject()) {

          VPackObjectBuilder b(builder.get());
          for (auto const &it: VPackObjectIterator(s)) {
            auto childBuilder =
              createTestStructure(it.value, path + "/" + it.key.copyString());
            if (childBuilder) {
              builder->add(it.key.copyString(), childBuilder->slice());
            }
          }
          if (path == "/arango/Target/ToDo") {
            builder->add(jobId, createBuilder(todo).slice());
          }
          if (path == "/arango/Plan/Collections/" + DATABASE + "/" + CLONE) {
            builder->add("distributeShardsLike", VPackValue(COLLECTION));
          }
        } else {
          builder->add(s);
        }
        return builder;

      };

      auto builder = createTestStructure(baseStructure.toBuilder().slice(), "");
      REQUIRE(builder);
      std::cout << builder->toJson() << std::endl;
      Node agency = createNodeFromBuilder(*builder);

      Mock<AgentInterface> mockAgent;
      When(Method(mockAgent, write)).AlwaysDo(
        [&](query_t const &q, consensus::AgentInterface::WriteMode w) -> write_ret_t {
          INFO(q->slice().toJson());
          REQUIRE(typeName(q->slice()) == "array");
          REQUIRE(q->slice().length() == 1);
          REQUIRE(typeName(q->slice()[0]) == "array");
          REQUIRE(q->slice()[0].length() == 2); // precondition
          REQUIRE(typeName(q->slice()[0][0]) == "object");

          auto writes = q->slice()[0][0];
          REQUIRE(typeName(writes.get("/arango/Target/ToDo/1")) == "object");
          REQUIRE(typeName(writes.get("/arango/Target/ToDo/1").get("op")) == "string");
          CHECK(writes.get("/arango/Target/ToDo/1").get("op").copyString() == "delete");
          CHECK(writes.get("/arango/Target/Finished/1").get("collection").copyString() == COLLECTION);
          CHECK(typeName(writes.get("/arango/Target/Failed/1")) == "none");

          auto precond = q->slice()[0][1];
          REQUIRE(typeName(precond) == "object");
          REQUIRE(typeName(precond.get("/arango/Supervision/Health/follower1/Status")) == "object");

          return fakeWriteResult;
        }
      );
      When(Method(mockAgent, waitFor)).AlwaysReturn(AgentInterface::raft_commit_t::OK);
      AgentInterface &agent = mockAgent.get();
      RemoveFollower(agency("arango"), &agent, JOB_STATUS::TODO, jobId).start(aborts);

    }

    SECTION("the leader has acknowledged its leadership in Current for all "
      "these shards and at least replicationFactor - 1 servers are in sync "
      "with the leader according to Current for all shards") {
    }

    SECTION("if there is no job under Supervision/Shards/<shard> (if so, do "
      "nothing, leave job in ToDo") {

    }

    SECTION("All good should remove follower") {

      TestStructType createTestStructure = [&](
        Slice const& s, std::string const& path) {

        std::unique_ptr<Builder> builder = std::make_unique<Builder>();
        if (s.isObject()) {
          VPackObjectBuilder b(builder.get());
          for (auto const& it: VPackObjectIterator(s)) {
            auto childBuilder =
              createTestStructure(it.value, path + "/" + it.key.copyString());
            if (childBuilder) {
              builder->add(it.key.copyString(), childBuilder->slice());
            }
          }
          if (path == "/arango/Target/ToDo") {
            builder->add(jobId, createBuilder(todo).slice());
          }
        } else {
          builder->add(s);
        }
        return builder;

      };

      auto builder = createTestStructure(baseStructure.toBuilder().slice(), "");
      REQUIRE(builder);
      auto agency = createNodeFromBuilder(*builder);

      Mock<AgentInterface> mockAgent;
      When(Method(mockAgent, write)).AlwaysDo([&](query_t const& q, consensus::AgentInterface::WriteMode w) -> write_ret_t {
          INFO(q->slice().toJson());
          REQUIRE(typeName(q->slice()) == "array" );
          REQUIRE(q->slice().length() == 1);
          REQUIRE(typeName(q->slice()[0]) == "array");
          REQUIRE(q->slice()[0].length() == 2); // we always simply override! no preconditions...
          REQUIRE(typeName(q->slice()[0][0]) == "object");

          auto writes = q->slice()[0][0];
          REQUIRE(typeName(writes.get("/arango/Target/ToDo/1")) == "object");
          REQUIRE(typeName(writes.get("/arango/Target/ToDo/1").get("op")) == "string");
          CHECK(writes.get("/arango/Target/ToDo/1").get("op").copyString() == "delete");
          CHECK(typeName(writes.get("/arango/Target/Finished/1")) == "object");
          return fakeWriteResult;
        });
      When(Method(mockAgent, waitFor)).AlwaysReturn(AgentInterface::raft_commit_t::OK);
      auto& agent = mockAgent.get();
      RemoveFollower(agency("arango"), &agent, JOB_STATUS::TODO, jobId).start(aborts);

      REQUIRE_NOTHROW(Verify(Method(mockAgent, write)));
    }
  }

  GIVEN("An agency with 12 DBServers") {

    auto baseStructure = createNode(agencyLarge.c_str());
    arangodb::RandomGenerator::initialize(arangodb::RandomGenerator::RandomType::MERSENNE);

    Builder builder;
    baseStructure.toBuilder(builder);

    std::string jobId = "1";

    write_ret_t fakeWriteResult{true, "", std::vector<apply_ret_t> {APPLIED}, std::vector<index_t> {1}};
    trans_ret_t fakeTransResult{true, "", 1, 0, std::make_shared<Builder>()};


    SECTION("Should remove the last followers") {

      TestStructType createTestStructure = [&](
        Slice const &s, std::string const &path
      ) {

        std::unique_ptr<Builder> builder = std::make_unique<Builder>();
        if (s.isObject()) {
          VPackObjectBuilder b(builder.get());
          for (auto const &it: VPackObjectIterator(s)) {
            auto childBuilder =
              createTestStructure(it.value, path + "/" + it.key.copyString());
            if (childBuilder) {
              builder->add(it.key.copyString(), childBuilder->slice());
            }
          }
          if (path == "/arango/Target/ToDo") {
            builder->add(jobId, createBuilder(todo).slice());
          }
        } else {
          builder->add(s);
        }
        return builder;

      };

      auto builder = createTestStructure(baseStructure.toBuilder().slice(), "");
      REQUIRE(builder);
      auto agency = createNodeFromBuilder(*builder);

      // The reason for using so much DBServers is to make it nearly impossible
      // for the test to pass by accident. Trying with lower numbers
      // (say remove 5 out of 10) seemed to indicate that the implementation
      // of unordered_map makes it, at least for small numbers, likely
      // that the last added elements appear first when iterating over it.
      // When choosing different names for the 10 DBServers, I expected the
      // order to change (and it did), but in 4 out of 5 tries made the correct
      // DBServers were removed, while I expected the chance for that to be
      // 1 / (10 choose 5) = 1/252.
      // Thus I increased the agency to 100 DBServers with a replicationFactor
      // of 50.

      Mock<AgentInterface> mockAgent;
      When(Method(mockAgent, write)).AlwaysDo(
        [&](query_t const &q, consensus::AgentInterface::WriteMode w) -> write_ret_t {
          INFO(q->slice().toJson());
          REQUIRE(typeName(q->slice()) == "array");
          REQUIRE(q->slice().length() == 1);
          REQUIRE(typeName(q->slice()[0]) == "array");
          REQUIRE(q->slice()[0].length() == 2); // we always simply override! no preconditions...
          REQUIRE(typeName(q->slice()[0][0]) == "object");

          Slice writes = q->slice()[0][0];
          REQUIRE(typeName(writes.get("/arango/Target/ToDo/1")) == "object");
          REQUIRE(typeName(writes.get("/arango/Target/ToDo/1").get("op")) == "string");
          CHECK(writes.get("/arango/Target/ToDo/1").get("op").copyString() == "delete");
          CHECK(typeName(writes.get("/arango/Target/Finished/1")) == "object");
          Slice servers = writes.get("/arango/Plan/Collections/database/collection1/shards/s1");
          REQUIRE(typeName(servers) == "array");
          INFO(servers.toJson());
          REQUIRE(servers.length() == 50);
          REQUIRE(servers[0].copyString() == "leader");
          REQUIRE(servers[1].copyString() == "follower-1-48a5e486-10c9-4953-8630-9a3de12a6169");
          REQUIRE(servers[2].copyString() == "follower-2-34e18222-8ce3-4016-9558-7092e41eb22c");
          REQUIRE(servers[3].copyString() == "follower-3-27452c0b-efc8-4d9a-b5b1-d557997c4337");
          REQUIRE(servers[4].copyString() == "follower-4-cc56c772-58cc-4c16-b571-56283ad813c8");
          REQUIRE(servers[5].copyString() == "follower-5-aec34c5c-9939-42af-bf5d-afc15f960c50");
          REQUIRE(servers[6].copyString() == "follower-6-8477db61-d46f-46f7-a816-8176e1514494");
          REQUIRE(servers[7].copyString() == "follower-7-58b689ae-e7e8-45e7-83cb-6006b2375f61");
          REQUIRE(servers[8].copyString() == "follower-8-d5e9c550-4a68-4dca-a50d-c84d4b690945");
          REQUIRE(servers[9].copyString() == "follower-9-349e7296-b4fc-4fd3-b8a8-02befbb0380e");
          REQUIRE(servers[10].copyString() == "follower-10-1ad1aa18-00b3-430a-8144-ba973bfed5fe");
          REQUIRE(servers[11].copyString() == "follower-11-110920e0-d079-4f06-99ed-c482d19b5112");
          REQUIRE(servers[12].copyString() == "follower-12-b7d64986-c458-4332-934a-ecb2caf19259");
          REQUIRE(servers[13].copyString() == "follower-13-2e7ba82c-b837-4126-8cda-0db6ac98e30b");
          REQUIRE(servers[14].copyString() == "follower-14-6b9d6b95-420f-44d8-a714-d17ae95eecdd");
          REQUIRE(servers[15].copyString() == "follower-15-08c7dc8d-bb31-4cc3-a7ca-4b8bfba19b70");
          REQUIRE(servers[16].copyString() == "follower-16-5a301b07-d1d8-4c86-8e8a-bd7957a2cafb");
          REQUIRE(servers[17].copyString() == "follower-17-fd04d0f0-821e-401e-8f8e-0b2837ddc41d");
          REQUIRE(servers[18].copyString() == "follower-18-0a2bfdf4-c277-45ea-8af3-4d60eba67910");
          REQUIRE(servers[19].copyString() == "follower-19-69c98e93-b1c2-416f-b5e4-84cc50b65efe");
          REQUIRE(servers[20].copyString() == "follower-20-e9eca0f2-530b-4496-950e-341b71086f8b");
          REQUIRE(servers[21].copyString() == "follower-21-1042a97a-aa82-48ee-8388-8480a6e57249");
          REQUIRE(servers[22].copyString() == "follower-22-c3922c1e-53df-42d6-9bcd-476d01e581fd");
          REQUIRE(servers[23].copyString() == "follower-23-cec0e2ed-3a5b-4b9a-a615-39a1f24179c2");
          REQUIRE(servers[24].copyString() == "follower-24-1753643f-2d1e-4014-8cc6-4f063c0f143e");
          REQUIRE(servers[25].copyString() == "follower-25-1a4edf05-e6ed-47bc-8765-0b8292fc3175");
          REQUIRE(servers[26].copyString() == "follower-26-fcc5fb9e-b4a0-4986-ae14-8b330350fa67");
          REQUIRE(servers[27].copyString() == "follower-27-aa738702-aeb8-4306-86cd-a77516eef44d");
          REQUIRE(servers[28].copyString() == "follower-28-4f6cd6dc-9e12-4fcc-9083-23900ffad0d1");
          REQUIRE(servers[29].copyString() == "follower-29-884e050b-0d33-440b-88bf-13cd41e00c10");
          REQUIRE(servers[30].copyString() == "follower-30-bac109ba-a0ba-4235-b665-743fec5e2ea1");
          REQUIRE(servers[31].copyString() == "follower-31-62a74a8e-f141-44bb-a818-57259c7d6323");
          REQUIRE(servers[32].copyString() == "follower-32-7a0e8f27-04a4-4094-a00c-830dfe3e937c");
          REQUIRE(servers[33].copyString() == "follower-33-83c9df58-91b1-4703-bce7-1d47c633a2c4");
          REQUIRE(servers[34].copyString() == "follower-34-d8f1aa6e-fbd0-49c0-9560-b447417d0284");
          REQUIRE(servers[35].copyString() == "follower-35-77b8626e-30d8-4b04-8ac9-42dd788a4c46");
          REQUIRE(servers[36].copyString() == "follower-36-8239c391-86fe-462d-9036-c129983103f2");
          REQUIRE(servers[37].copyString() == "follower-37-41b1fe2a-2826-43a6-8222-fc9480b4f211");
          REQUIRE(servers[38].copyString() == "follower-38-4a4b54db-17ff-4f5f-882b-973907d9dc27");
          REQUIRE(servers[39].copyString() == "follower-39-e6e0cb50-a609-4f5f-b376-4ec72fefb938");
          REQUIRE(servers[40].copyString() == "follower-40-2c6f13c1-46dc-4d54-992f-4f923169e5e2");
          REQUIRE(servers[41].copyString() == "follower-41-b4c3d57c-ec01-4162-8107-823a09176fc4");
          REQUIRE(servers[42].copyString() == "follower-42-e65dfaf4-cdbd-485a-a4d3-f56848e58d28");
          REQUIRE(servers[43].copyString() == "follower-43-a248deeb-817f-4f0d-9813-c08a40e9027a");
          REQUIRE(servers[44].copyString() == "follower-44-c8f4e52e-7a12-4a3b-8a93-cd543f512a55");
          REQUIRE(servers[45].copyString() == "follower-45-d2a70a84-2a12-4fa3-b0e9-68945fd34cfc");
          REQUIRE(servers[46].copyString() == "follower-46-bf70b49c-ff50-4255-a704-70a5a4d7a4b3");
          REQUIRE(servers[47].copyString() == "follower-47-ca6aaf76-0bf8-4289-9033-605883e514ca");
          REQUIRE(servers[48].copyString() == "follower-48-30442bc5-2dc0-434c-b21f-989610a199e7");
          REQUIRE(servers[49].copyString() == "follower-49-788d2a9b-6d56-42a7-bacb-1dafff7d58a9");
          return fakeWriteResult;
        }
      );
      When(Method(mockAgent, waitFor)).AlwaysReturn(AgentInterface::raft_commit_t::OK);
      auto &agent = mockAgent.get();
      RemoveFollower(agency("arango"), &agent, JOB_STATUS::TODO, jobId).start(aborts);

      REQUIRE_NOTHROW(Verify(Method(mockAgent, write)));
    }
  }
  
};

}}}