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diff --git a/src/mongo/db/repl/rollback_test_fixture.h b/src/mongo/db/repl/rollback_test_fixture.h
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+/**
+ *    Copyright (C) 2017 MongoDB Inc.
+ *
+ *    This program is free software: you can redistribute it and/or  modify
+ *    it under the terms of the GNU Affero General Public License, version 3,
+ *    as published by the Free Software Foundation.
+ *
+ *    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
+ *    GNU Affero General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Affero General Public License
+ *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *    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 GNU Affero General 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 "mongo/db/repl/replication_coordinator_mock.h"
+#include "mongo/db/repl/storage_interface_mock.h"
+#include "mongo/db/service_context.h"
+#include "mongo/db/service_context_d_test_fixture.h"
+#include "mongo/executor/thread_pool_task_executor_test_fixture.h"
+
+namespace mongo {
+namespace repl {
+
+/**
+ * Test fixture for both 3.4 and 3.6 rollback unit tests.
+ * The fixture makes available to tests:
+ * - an "ephemeralForTest" storage engine for checking results of the rollback algorithm at the
+ *   storage layer. The storage engine is initialized as part of the ServiceContextForMongoD test
+ *   fixture.
+ * - a task executor for simulating remote command responses from the sync source. The
+ *   ThreadPoolExecutorTest is used to initialize the task executor.
+ */
+class RollbackTest : public unittest::Test {
+public:
+    /**
+     * Initializes executor::ThreadPoolExecutorTest so that each thread is initialized with a
+     * Client.
+     */
+    RollbackTest();
+
+    /**
+     * Initializes the service context and task executor.
+     */
+    void setUp() override;
+
+    /**
+     * Destroys the service context and task executor.
+     *
+     * Note on overriding tearDown() in tests:
+     * Tests should explicitly shut down and join the task executor (by invoking
+     * TaskExecutorTest::shutdownExecutorThread() and TaskExecutorTest::joinExecutorThread()
+     * respectively) before calling RollbackTest::tearDown().
+     * This cancels outstanding tasks and remote command requests scheduled using the task
+     * executor.
+     */
+    void tearDown() override;
+
+protected:
+    // Test fixture used to manage the service context and global storage engine.
+    ServiceContextMongoDTest _serviceContextMongoDTest;
+
+    // Test fixture used to manage the task executor.
+    executor::ThreadPoolExecutorTest _threadPoolExecutorTest;
+
+    // OperationContext provided to test cases for storage layer operations.
+    ServiceContext::UniqueOperationContext _opCtx;
+
+    // ReplicationCoordinator mock implementation for rollback tests.
+    // Owned by service context.
+    class ReplicationCoordinatorRollbackMock;
+    ReplicationCoordinatorRollbackMock* _coordinator = nullptr;
+
+    // StorageInterface used to access minValid.
+    StorageInterfaceMock _storageInterface;
+};
+
+/**
+ * ReplicationCoordinator mock implementation for rollback tests.
+ */
+class RollbackTest::ReplicationCoordinatorRollbackMock : public ReplicationCoordinatorMock {
+public:
+    ReplicationCoordinatorRollbackMock(ServiceContext* service);
+
+    /**
+     * Base class implementation triggers an invariant. This function is overridden to be a no-op
+     * for rollback tests.
+     */
+    void resetLastOpTimesFromOplog(OperationContext* opCtx) override;
+
+    /**
+     * Returns false (does not forward call to ReplicationCoordinatorMock::setFollowerMode())
+     * if new state requested is '_failSetFollowerModeOnThisMemberState'.
+     * Otherwise, calls ReplicationCoordinatorMock::setFollowerMode().
+     */
+    bool setFollowerMode(const MemberState& newState) override;
+
+    // Override this to make setFollowerMode() fail when called with this state.
+    MemberState _failSetFollowerModeOnThisMemberState = MemberState::RS_UNKNOWN;
+};
+
+}  // namespace repl
+}  // namespace mongo