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diff --git a/src/mongo/s/request_types/migration_secondary_throttle_options_test.cpp b/src/mongo/s/request_types/migration_secondary_throttle_options_test.cpp
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+++ b/src/mongo/s/request_types/migration_secondary_throttle_options_test.cpp
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+/**
+ *    Copyright (C) 2016 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.
+ */
+
+#include "mongo/platform/basic.h"
+
+#include "mongo/bson/bsonmisc.h"
+#include "mongo/db/write_concern_options.h"
+#include "mongo/s/request_types/migration_secondary_throttle_options.h"
+#include "mongo/unittest/unittest.h"
+
+namespace mongo {
+
+using unittest::assertGet;
+
+namespace {
+
+TEST(MigrationSecondaryThrottleOptions, CreateDefault) {
+    MigrationSecondaryThrottleOptions options =
+        MigrationSecondaryThrottleOptions::create(MigrationSecondaryThrottleOptions::kDefault);
+    ASSERT_EQ(MigrationSecondaryThrottleOptions::kDefault, options.getSecondaryThrottle());
+    ASSERT(!options.isWriteConcernSpecified());
+    ASSERT_BSONOBJ_EQ(BSONObj(), options.toBSON());
+}
+
+TEST(MigrationSecondaryThrottleOptions, CreateOn) {
+    MigrationSecondaryThrottleOptions options =
+        MigrationSecondaryThrottleOptions::create(MigrationSecondaryThrottleOptions::kOn);
+    ASSERT_EQ(MigrationSecondaryThrottleOptions::kOn, options.getSecondaryThrottle());
+    ASSERT(!options.isWriteConcernSpecified());
+    ASSERT_BSONOBJ_EQ(BSON("secondaryThrottle" << true), options.toBSON());
+}
+
+TEST(MigrationSecondaryThrottleOptions, CreateOff) {
+    MigrationSecondaryThrottleOptions options =
+        MigrationSecondaryThrottleOptions::create(MigrationSecondaryThrottleOptions::kOff);
+    ASSERT_EQ(MigrationSecondaryThrottleOptions::kOff, options.getSecondaryThrottle());
+    ASSERT(!options.isWriteConcernSpecified());
+    ASSERT_BSONOBJ_EQ(BSON("secondaryThrottle" << false), options.toBSON());
+}
+
+TEST(MigrationSecondaryThrottleOptions, NotSpecifiedInCommandBSON) {
+    MigrationSecondaryThrottleOptions options = assertGet(
+        MigrationSecondaryThrottleOptions::createFromCommand(BSON("someOtherField" << 1)));
+    ASSERT_EQ(MigrationSecondaryThrottleOptions::kDefault, options.getSecondaryThrottle());
+    ASSERT(!options.isWriteConcernSpecified());
+    ASSERT_BSONOBJ_EQ(BSONObj(), options.toBSON());
+}
+
+TEST(MigrationSecondaryThrottleOptions, EnabledInCommandBSONWithoutWriteConcern) {
+    MigrationSecondaryThrottleOptions options =
+        assertGet(MigrationSecondaryThrottleOptions::createFromCommand(
+            BSON("someOtherField" << 1 << "secondaryThrottle" << true)));
+    ASSERT_EQ(MigrationSecondaryThrottleOptions::kOn, options.getSecondaryThrottle());
+    ASSERT(!options.isWriteConcernSpecified());
+}
+
+TEST(MigrationSecondaryThrottleOptions, EnabledInCommandBSONWithSimpleWriteConcern) {
+    MigrationSecondaryThrottleOptions options =
+        assertGet(MigrationSecondaryThrottleOptions::createFromCommand(
+            BSON("someOtherField" << 1 << "secondaryThrottle" << true << "writeConcern"
+                                  << BSON("w" << 2))));
+    ASSERT_EQ(MigrationSecondaryThrottleOptions::kOn, options.getSecondaryThrottle());
+    ASSERT(options.isWriteConcernSpecified());
+
+    WriteConcernOptions writeConcern = options.getWriteConcern();
+    ASSERT_EQ(2, writeConcern.wNumNodes);
+    ASSERT_EQ(static_cast<int>(WriteConcernOptions::SyncMode::UNSET),
+              static_cast<int>(writeConcern.syncMode));
+    ASSERT_EQ(WriteConcernOptions::kNoTimeout, writeConcern.wTimeout);
+}
+
+TEST(MigrationSecondaryThrottleOptions, EnabledInCommandBSONWithCompleteWriteConcern) {
+    MigrationSecondaryThrottleOptions options =
+        assertGet(MigrationSecondaryThrottleOptions::createFromCommand(
+            BSON("someOtherField" << 1 << "secondaryThrottle" << true << "writeConcern"
+                                  << BSON("w" << 3 << "j" << true))));
+    ASSERT_EQ(MigrationSecondaryThrottleOptions::kOn, options.getSecondaryThrottle());
+    ASSERT(options.isWriteConcernSpecified());
+
+    WriteConcernOptions writeConcern = options.getWriteConcern();
+    ASSERT_EQ(3, writeConcern.wNumNodes);
+    ASSERT_EQ(static_cast<int>(WriteConcernOptions::SyncMode::JOURNAL),
+              static_cast<int>(writeConcern.syncMode));
+    ASSERT_EQ(WriteConcernOptions::kNoTimeout, writeConcern.wTimeout);
+}
+
+TEST(MigrationSecondaryThrottleOptions, DisabledInCommandBSON) {
+    MigrationSecondaryThrottleOptions options =
+        assertGet(MigrationSecondaryThrottleOptions::createFromCommand(
+            BSON("someOtherField" << 1 << "secondaryThrottle" << false)));
+    ASSERT_EQ(MigrationSecondaryThrottleOptions::kOff, options.getSecondaryThrottle());
+}
+
+TEST(MigrationSecondaryThrottleOptions, NotSpecifiedInBalancerConfig) {
+    MigrationSecondaryThrottleOptions options = assertGet(
+        MigrationSecondaryThrottleOptions::createFromBalancerConfig(BSON("someOtherField" << 1)));
+    ASSERT_EQ(MigrationSecondaryThrottleOptions::kDefault, options.getSecondaryThrottle());
+    ASSERT(!options.isWriteConcernSpecified());
+    ASSERT_BSONOBJ_EQ(BSONObj(), options.toBSON());
+}
+
+TEST(MigrationSecondaryThrottleOptions, EnabledInBalancerConfigLegacyStyle) {
+    MigrationSecondaryThrottleOptions options =
+        assertGet(MigrationSecondaryThrottleOptions::createFromBalancerConfig(
+            BSON("someOtherField" << 1 << "_secondaryThrottle" << true)));
+    ASSERT_EQ(MigrationSecondaryThrottleOptions::kOn, options.getSecondaryThrottle());
+    ASSERT(!options.isWriteConcernSpecified());
+}
+
+TEST(MigrationSecondaryThrottleOptions, EnabledInBalancerConfigWithSimpleWriteConcern) {
+    MigrationSecondaryThrottleOptions options =
+        assertGet(MigrationSecondaryThrottleOptions::createFromBalancerConfig(
+            BSON("someOtherField" << 1 << "_secondaryThrottle" << BSON("w" << 2))));
+    ASSERT_EQ(MigrationSecondaryThrottleOptions::kOn, options.getSecondaryThrottle());
+    ASSERT(options.isWriteConcernSpecified());
+
+    WriteConcernOptions writeConcern = options.getWriteConcern();
+    ASSERT_EQ(2, writeConcern.wNumNodes);
+    ASSERT_EQ(static_cast<int>(WriteConcernOptions::SyncMode::UNSET),
+              static_cast<int>(writeConcern.syncMode));
+    ASSERT_EQ(WriteConcernOptions::kNoTimeout, writeConcern.wTimeout);
+}
+
+TEST(MigrationSecondaryThrottleOptions, EnabledInBalancerConfigWithCompleteWriteConcern) {
+    MigrationSecondaryThrottleOptions options =
+        assertGet(MigrationSecondaryThrottleOptions::createFromBalancerConfig(
+            BSON("someOtherField" << 1 << "_secondaryThrottle" << BSON("w" << 3 << "j" << true))));
+    ASSERT_EQ(MigrationSecondaryThrottleOptions::kOn, options.getSecondaryThrottle());
+    ASSERT(options.isWriteConcernSpecified());
+
+    WriteConcernOptions writeConcern = options.getWriteConcern();
+    ASSERT_EQ(3, writeConcern.wNumNodes);
+    ASSERT_EQ(static_cast<int>(WriteConcernOptions::SyncMode::JOURNAL),
+              static_cast<int>(writeConcern.syncMode));
+    ASSERT_EQ(WriteConcernOptions::kNoTimeout, writeConcern.wTimeout);
+}
+
+TEST(MigrationSecondaryThrottleOptions, DisabledInBalancerConfig) {
+    MigrationSecondaryThrottleOptions options =
+        assertGet(MigrationSecondaryThrottleOptions::createFromCommand(
+            BSON("someOtherField" << 1 << "_secondaryThrottle" << false)));
+    ASSERT_EQ(MigrationSecondaryThrottleOptions::kOff, options.getSecondaryThrottle());
+}
+
+TEST(MigrationSecondaryThrottleOptions, ParseFailsDisabledInCommandBSONWriteConcernSpecified) {
+    auto status = MigrationSecondaryThrottleOptions::createFromCommand(
+        BSON("someOtherField" << 1 << "secondaryThrottle" << false << "writeConcern"
+                              << BSON("w"
+                                      << "majority")));
+    ASSERT_EQ(ErrorCodes::UnsupportedFormat, status.getStatus().code());
+}
+
+TEST(MigrationSecondaryThrottleOptions, ParseFailsNotSpecifiedInCommandBSONWriteConcernSpecified) {
+    auto status = MigrationSecondaryThrottleOptions::createFromCommand(
+        BSON("someOtherField" << 1 << "writeConcern" << BSON("w"
+                                                             << "majority")));
+    ASSERT_EQ(ErrorCodes::UnsupportedFormat, status.getStatus().code());
+}
+
+TEST(MigrationSecondaryThrottleOptions, EqualityOperatorSameValue) {
+    auto value1 = MigrationSecondaryThrottleOptions::createWithWriteConcern(
+        WriteConcernOptions("majority", WriteConcernOptions::SyncMode::JOURNAL, 30000));
+    auto value2 = MigrationSecondaryThrottleOptions::createWithWriteConcern(
+        WriteConcernOptions("majority", WriteConcernOptions::SyncMode::JOURNAL, 30000));
+
+    ASSERT(value1 == value2);
+}
+
+TEST(MigrationSecondaryThrottleOptions, EqualityOperatorDifferentValues) {
+    auto value1 = MigrationSecondaryThrottleOptions::createWithWriteConcern(
+        WriteConcernOptions("majority", WriteConcernOptions::SyncMode::JOURNAL, 30000));
+    auto value2 = MigrationSecondaryThrottleOptions::createWithWriteConcern(
+        WriteConcernOptions("majority", WriteConcernOptions::SyncMode::JOURNAL, 60000));
+
+    ASSERT(!(value1 == value2));
+}
+
+}  // namespace
+}  // namespace mongo