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+
+/**
+ *    Copyright (C) 2018-present MongoDB, Inc.
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the Server Side Public License, version 1,
+ *    as published by MongoDB, Inc.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    Server Side Public License for more details.
+ *
+ *    You should have received a copy of the Server Side Public License
+ *    along with this program. If not, see
+ *    <http://www.mongodb.com/licensing/server-side-public-license>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the program with the OpenSSL library. You
+ *    must comply with the Server Side Public License in all respects for
+ *    all of the code used other than as permitted herein. If you modify file(s)
+ *    with this exception, you may extend this exception to your version of the
+ *    file(s), but you are not obligated to do so. If you do not wish to do so,
+ *    delete this exception statement from your version. If you delete this
+ *    exception statement from all source files in the program, then also delete
+ *    it in the license file.
+ */
+
+#pragma once
+
+#include <set>
+#include <vector>
+
+#include "mongo/base/status.h"
+#include "mongo/db/transaction_coordinator.h"
+#include "mongo/s/shard_id.h"
+#include "mongo/s/shard_server_test_fixture.h"
+
+namespace mongo {
+
+/**
+ * Implements common functionality shared across the various transaction coordinator unit-tests.
+ */
+class TransactionCoordinatorTestFixture : public ShardServerTestFixture {
+protected:
+    using PrepareResponse = txn::PrepareResponse;
+
+    void setUp() override;
+
+    /**
+     * Override the CatalogClient to make CatalogClient::getAllShards automatically return the
+     * expected shards. We cannot mock the network responses for the ShardRegistry reload, since the
+     * ShardRegistry reload is done over DBClient, not the NetworkInterface, and there is no
+     * DBClientMock analogous to the NetworkInterfaceMock.
+     */
+    std::unique_ptr<ShardingCatalogClient> makeShardingCatalogClient(
+        std::unique_ptr<DistLockManager> distLockManager) override;
+
+    void assertCommandSentAndRespondWith(const StringData& commandName,
+                                         const StatusWith<BSONObj>& response,
+                                         boost::optional<BSONObj> expectedWriteConcern);
+    /**
+     * These tests use the network task executor mock, which doesn't automatically execute tasks,
+     * which are scheduled with delay. This helper function advances the clock by 1 second (which is
+     * the maximum back-off in the transaction coordinator) and causes any retries to run.
+     */
+    void advanceClockAndExecuteScheduledTasks();
+
+    const std::vector<ShardId> kTwoShardIdList{{"s1"}, {"s2"}};
+    const std::set<ShardId> kTwoShardIdSet{{"s1"}, {"s2"}};
+    const std::vector<ShardId> kThreeShardIdList{{"s1"}, {"s2"}, {"s3"}};
+    const std::set<ShardId> kThreeShardIdSet{{"s1"}, {"s2"}, {"s3"}};
+
+    const Status kRetryableError{ErrorCodes::HostUnreachable,
+                                 "Retryable error for coordinator test"};
+};
+
+}  // namespace mongo