diff --git a/google-cloud-spanner/Gemfile b/google-cloud-spanner/Gemfile
index cb0c22cc..0a88531d 100644
--- a/google-cloud-spanner/Gemfile
+++ b/google-cloud-spanner/Gemfile
@@ -8,7 +8,7 @@ gem "google-cloud-core", "~> 1.8.0"
 gem "google-cloud-errors", "~> 1.5.0"
 gem "google-cloud-spanner-admin-database-v1", "~> 1.3"
 gem "google-cloud-spanner-admin-instance-v1", "~> 1.5"
-gem "google-cloud-spanner-v1", "~> 1.5"
+gem "google-cloud-spanner-v1", "~> 1.8"
 gem "google-style", "~> 1.31.0"
 gem "grpc", "~> 1.67"
 gem "grpc-tools", "~> 1.74", ">= 1.74.1"
diff --git a/google-cloud-spanner/lib/google/cloud/spanner/client.rb b/google-cloud-spanner/lib/google/cloud/spanner/client.rb
index 6929ed8f..60283426 100644
--- a/google-cloud-spanner/lib/google/cloud/spanner/client.rb
+++ b/google-cloud-spanner/lib/google/cloud/spanner/client.rb
@@ -1053,6 +1053,8 @@ def read table, columns, keys: nil, index: nil, limit: nil,
         # @param [Boolean] exclude_txn_from_change_streams If set to true,
         #   mutations will not be recorded in change streams with DDL option
         #   `allow_txn_exclusion=true`.
+        # @param [Google::Cloud::Spanner::V1::TransactionOptions::IsolationLevel] isolation_level The
+        #   isolation level for the transaction.
         # @param [Hash] commit_options A hash of commit options.
         #   e.g., return_commit_stats. Commit options are optional.
         #   The following options can be provided:
@@ -1143,7 +1145,7 @@ def read table, columns, keys: nil, index: nil, limit: nil,
         #                       request_options: request_options
         #
         def upsert table, rows,
-                   exclude_txn_from_change_streams: false,
+                   exclude_txn_from_change_streams: false, isolation_level: nil,
                    commit_options: nil, request_options: nil, call_options: nil
           request_options = Convert.to_request_options \
             request_options, tag_type: :transaction_tag
@@ -1151,6 +1153,7 @@ def upsert table, rows,
           @pool.with_session do |session|
             session.upsert table, rows,
                            exclude_txn_from_change_streams: exclude_txn_from_change_streams,
+                           isolation_level: isolation_level,
                            commit_options: commit_options,
                            request_options: request_options,
                            call_options: call_options
@@ -1200,6 +1203,8 @@ def upsert table, rows,
         # @param [Boolean] exclude_txn_from_change_streams If set to true,
         #   mutations will not be recorded in change streams with DDL option
         #   `allow_txn_exclusion=true`.
+        # @param [Google::Cloud::Spanner::V1::TransactionOptions::IsolationLevel] isolation_level The
+        #   isolation level for the transaction.
         # @param [Hash] commit_options A hash of commit options.
         #   e.g., return_commit_stats. Commit options are optional.
         #   The following options can be provided:
@@ -1290,7 +1295,7 @@ def upsert table, rows,
         #                       request_options: request_options
         #
         def insert table, rows,
-                   exclude_txn_from_change_streams: false,
+                   exclude_txn_from_change_streams: false, isolation_level: nil,
                    commit_options: nil, request_options: nil, call_options: nil
           request_options = Convert.to_request_options \
             request_options, tag_type: :transaction_tag
@@ -1298,6 +1303,7 @@ def insert table, rows,
           @pool.with_session do |session|
             session.insert table, rows,
                            exclude_txn_from_change_streams: exclude_txn_from_change_streams,
+                           isolation_level: isolation_level,
                            commit_options: commit_options,
                            request_options: request_options,
                            call_options: call_options
@@ -1346,6 +1352,8 @@ def insert table, rows,
         # @param [Boolean] exclude_txn_from_change_streams If set to true,
         #   mutations will not be recorded in change streams with DDL option
         #   `allow_txn_exclusion=true`.
+        # @param [Google::Cloud::Spanner::V1::TransactionOptions::IsolationLevel] isolation_level The
+        #   isolation level for the transaction.
         # @param [Hash] commit_options A hash of commit options.
         #   e.g., return_commit_stats. Commit options are optional.
         #   The following options can be provided:
@@ -1435,7 +1443,7 @@ def insert table, rows,
         #                      request_options: request_options
         #
         def update table, rows,
-                   exclude_txn_from_change_streams: false,
+                   exclude_txn_from_change_streams: false, isolation_level: nil,
                    commit_options: nil, request_options: nil, call_options: nil
           request_options = Convert.to_request_options \
             request_options, tag_type: :transaction_tag
@@ -1443,6 +1451,7 @@ def update table, rows,
           @pool.with_session do |session|
             session.update table, rows,
                            exclude_txn_from_change_streams: exclude_txn_from_change_streams,
+                           isolation_level: isolation_level,
                            commit_options: commit_options,
                            request_options: request_options,
                            call_options: call_options
@@ -1493,6 +1502,8 @@ def update table, rows,
         # @param [Boolean] exclude_txn_from_change_streams If set to true,
         #   mutations will not be recorded in change streams with DDL option
         #   `allow_txn_exclusion=true`.
+        # @param [Google::Cloud::Spanner::V1::TransactionOptions::IsolationLevel] isolation_level The
+        #   isolation level for the transaction.
         # @param [Hash] commit_options A hash of commit options.
         #   e.g., return_commit_stats. Commit options are optional.
         #   The following options can be provided:
@@ -1582,11 +1593,12 @@ def update table, rows,
         #                       request_options: request_options
         #
         def replace table, rows,
-                    exclude_txn_from_change_streams: false,
+                    exclude_txn_from_change_streams: false, isolation_level: nil,
                     commit_options: nil, request_options: nil, call_options: nil
           @pool.with_session do |session|
             session.replace table, rows,
                             exclude_txn_from_change_streams: exclude_txn_from_change_streams,
+                            isolation_level: isolation_level,
                             commit_options: commit_options,
                             request_options: request_options,
                             call_options: call_options
@@ -1616,6 +1628,8 @@ def replace table, rows,
         # @param [Boolean] exclude_txn_from_change_streams If set to true,
         #   mutations will not be recorded in change streams with DDL option
         #   `allow_txn_exclusion=true`.
+        # @param [Google::Cloud::Spanner::V1::TransactionOptions::IsolationLevel] isolation_level The
+        #   isolation level for the transaction.
         # @param [Hash] commit_options A hash of commit options.
         #   e.g., return_commit_stats. Commit options are optional.
         #   The following options can be provided:
@@ -1699,13 +1713,15 @@ def replace table, rows,
         #
         def delete table, keys = [],
                    exclude_txn_from_change_streams: false,
-                   commit_options: nil, request_options: nil, call_options: nil
+                   isolation_level: nil, commit_options: nil, request_options: nil,
+                   call_options: nil
           request_options = Convert.to_request_options \
             request_options, tag_type: :transaction_tag
 
           @pool.with_session do |session|
             session.delete table, keys,
                            exclude_txn_from_change_streams: exclude_txn_from_change_streams,
+                           isolation_level: isolation_level,
                            commit_options: commit_options,
                            request_options: request_options,
                            call_options: call_options
@@ -1730,6 +1746,8 @@ def delete table, keys = [],
         # @param [Boolean] exclude_txn_from_change_streams If set to true,
         #   mutations will not be recorded in change streams with DDL option
         #   `allow_txn_exclusion=true`.
+        # @param [Google::Cloud::Spanner::V1::TransactionOptions::IsolationLevel] isolation_level The
+        #   isolation level for the transaction.
         # @param [Hash] commit_options A hash of commit options.
         #   e.g., return_commit_stats. Commit options are optional.
         #   The following options can be provided:
@@ -1826,6 +1844,7 @@ def delete table, keys = [],
         #   end
         #
         def commit exclude_txn_from_change_streams: false,
+                   isolation_level: nil,
                    commit_options: nil, request_options: nil, call_options: nil,
                    &block
           raise ArgumentError, "Must provide a block" unless block_given?
@@ -1836,6 +1855,7 @@ def commit exclude_txn_from_change_streams: false,
           @pool.with_session do |session|
             session.commit(
               exclude_txn_from_change_streams: exclude_txn_from_change_streams,
+              isolation_level: isolation_level,
               commit_options: commit_options, request_options: request_options,
               call_options: call_options, &block
             )
diff --git a/google-cloud-spanner/lib/google/cloud/spanner/service.rb b/google-cloud-spanner/lib/google/cloud/spanner/service.rb
index cf1594d5..fcede55a 100644
--- a/google-cloud-spanner/lib/google/cloud/spanner/service.rb
+++ b/google-cloud-spanner/lib/google/cloud/spanner/service.rb
@@ -534,13 +534,15 @@ def partition_query session_name, sql, transaction, params: nil,
         # @return [::Google::Cloud::Spanner::V1::CommitResponse]
         def commit session_name, mutations = [],
                    transaction_id: nil, exclude_txn_from_change_streams: false,
-                   commit_options: nil, request_options: nil, call_options: nil
+                   isolation_level: nil, commit_options: nil, request_options: nil,
+                   call_options: nil
           route_to_leader = LARHeaders.commit
           tx_opts = nil
           if transaction_id.nil?
             tx_opts = V1::TransactionOptions.new(
               read_write: V1::TransactionOptions::ReadWrite.new,
-              exclude_txn_from_change_streams: exclude_txn_from_change_streams
+              exclude_txn_from_change_streams: exclude_txn_from_change_streams,
+              isolation_level: isolation_level
             )
           end
           opts = default_options session_name: session_name,
@@ -589,12 +591,14 @@ def rollback session_name, transaction_id, call_options: nil
 
         def begin_transaction session_name,
                               exclude_txn_from_change_streams: false,
+                              isolation_level: nil,
                               request_options: nil,
                               call_options: nil,
                               route_to_leader: nil
           tx_opts = V1::TransactionOptions.new(
             read_write: V1::TransactionOptions::ReadWrite.new,
-            exclude_txn_from_change_streams: exclude_txn_from_change_streams
+            exclude_txn_from_change_streams: exclude_txn_from_change_streams,
+            isolation_level: isolation_level
           )
           opts = default_options session_name: session_name,
                                  call_options: call_options,
@@ -626,7 +630,7 @@ def batch_write session_name,
         end
 
         def create_snapshot session_name, strong: nil, timestamp: nil,
-                            staleness: nil, call_options: nil
+                            isolation_level: nil, staleness: nil, call_options: nil
           tx_opts = V1::TransactionOptions.new(
             read_only: V1::TransactionOptions::ReadOnly.new(
               {
@@ -635,7 +639,8 @@ def create_snapshot session_name, strong: nil, timestamp: nil,
                 exact_staleness: Convert.number_to_duration(staleness),
                 return_read_timestamp: true
               }.compact
-            )
+            ),
+            isolation_level: isolation_level
           )
           opts = default_options session_name: session_name,
                                  call_options: call_options
@@ -645,10 +650,12 @@ def create_snapshot session_name, strong: nil, timestamp: nil,
 
         def create_pdml session_name,
                         exclude_txn_from_change_streams: false,
+                        isolation_level: nil,
                         call_options: nil
           tx_opts = V1::TransactionOptions.new(
             partitioned_dml: V1::TransactionOptions::PartitionedDml.new,
-            exclude_txn_from_change_streams: exclude_txn_from_change_streams
+            exclude_txn_from_change_streams: exclude_txn_from_change_streams,
+            isolation_level: isolation_level
           )
           route_to_leader = LARHeaders.begin_transaction true
           opts = default_options session_name: session_name,
diff --git a/google-cloud-spanner/lib/google/cloud/spanner/session.rb b/google-cloud-spanner/lib/google/cloud/spanner/session.rb
index 573459cf..eb9fa877 100644
--- a/google-cloud-spanner/lib/google/cloud/spanner/session.rb
+++ b/google-cloud-spanner/lib/google/cloud/spanner/session.rb
@@ -593,6 +593,8 @@ def partition_read table, columns, transaction, keys: nil,
         # @param [Boolean] exclude_txn_from_change_streams If set to true,
         #   mutations will not be recorded in change streams with DDL option
         #   `allow_txn_exclusion=true`. Used if starting a new transaction.
+        # @param [Google::Cloud::Spanner::V1::TransactionOptions::IsolationLevel] isolation_level The
+        #   isolation level for the transaction.
         # @param [Hash] commit_options A hash of commit options.
         #   e.g., return_commit_stats. Commit options are optional.
         #   The following options can be provided:
@@ -671,13 +673,15 @@ def partition_read table, columns, transaction, keys: nil,
         #   puts commit_resp.stats.mutation_count
         #
         def commit transaction_id: nil, exclude_txn_from_change_streams: false,
-                   commit_options: nil, request_options: nil, call_options: nil
+                   isolation_level: nil, commit_options: nil, request_options: nil,
+                   call_options: nil
           ensure_service!
           commit = Commit.new
           yield commit
           commit_resp = service.commit path, commit.mutations,
                                        transaction_id: transaction_id,
                                        exclude_txn_from_change_streams: exclude_txn_from_change_streams,
+                                       isolation_level: isolation_level,
                                        commit_options: commit_options,
                                        request_options: request_options,
                                        call_options: call_options
@@ -818,6 +822,8 @@ def batch_write exclude_txn_from_change_streams: false,
         # @param [Boolean] exclude_txn_from_change_streams If set to true,
         #   mutations will not be recorded in change streams with DDL option
         #   `allow_txn_exclusion=true`. Used if starting a new transaction.
+        # @param [Google::Cloud::Spanner::V1::TransactionOptions::IsolationLevel] isolation_level The
+        #   isolation level for the transaction.
         # @param [Hash] commit_options A hash of commit options.
         #   e.g., return_commit_stats. Commit options are optional.
         #   The following options can be provided:
@@ -890,10 +896,12 @@ def batch_write exclude_txn_from_change_streams: false,
         #
         def upsert table, *rows,
                    transaction_id: nil, exclude_txn_from_change_streams: false,
-                   commit_options: nil, request_options: nil, call_options: nil
+                   isolation_level: nil, commit_options: nil, request_options: nil,
+                   call_options: nil
           opts = {
             transaction_id: transaction_id,
             exclude_txn_from_change_streams: exclude_txn_from_change_streams,
+            isolation_level: isolation_level,
             commit_options: commit_options,
             request_options: request_options,
             call_options: call_options
@@ -938,6 +946,8 @@ def upsert table, *rows,
         # @param [Boolean] exclude_txn_from_change_streams If set to true,
         #   mutations will not be recorded in change streams with DDL option
         #   `allow_txn_exclusion=true`. Used if starting a new transaction.
+        # @param [Google::Cloud::Spanner::V1::TransactionOptions::IsolationLevel] isolation_level The
+        #   isolation level for the transaction.
         # @param [Hash] commit_options A hash of commit options.
         #   e.g., return_commit_stats. Commit options are optional.
         #   The following options can be provided:
@@ -1010,10 +1020,12 @@ def upsert table, *rows,
         #
         def insert table, *rows,
                    transaction_id: nil, exclude_txn_from_change_streams: false,
-                   commit_options: nil, request_options: nil, call_options: nil
+                   isolation_level: nil, commit_options: nil, request_options: nil,
+                   call_options: nil
           opts = {
             transaction_id: transaction_id,
             exclude_txn_from_change_streams: exclude_txn_from_change_streams,
+            isolation_level: isolation_level,
             commit_options: commit_options,
             request_options: request_options,
             call_options: call_options
@@ -1057,6 +1069,8 @@ def insert table, *rows,
         # @param [Boolean] exclude_txn_from_change_streams If set to true,
         #   mutations will not be recorded in change streams with DDL option
         #   `allow_txn_exclusion=true`. Used if starting a new transaction.
+        # @param [Google::Cloud::Spanner::V1::TransactionOptions::IsolationLevel] isolation_level The
+        #   isolation level for the transaction.
         # @param [Hash] commit_options A hash of commit options.
         #   e.g., return_commit_stats. Commit options are optional.
         #   The following options can be provided:
@@ -1129,10 +1143,12 @@ def insert table, *rows,
         #
         def update table, *rows,
                    transaction_id: nil, exclude_txn_from_change_streams: false,
-                   commit_options: nil, request_options: nil, call_options: nil
+                   isolation_level: nil, commit_options: nil, request_options: nil,
+                   call_options: nil
           opts = {
             transaction_id: transaction_id,
             exclude_txn_from_change_streams: exclude_txn_from_change_streams,
+            isolation_level: isolation_level,
             commit_options: commit_options,
             request_options: request_options,
             call_options: call_options
@@ -1178,6 +1194,8 @@ def update table, *rows,
         # @param [Boolean] exclude_txn_from_change_streams If set to true,
         #   mutations will not be recorded in change streams with DDL option
         #   `allow_txn_exclusion=true`. Used if starting a new transaction.
+        # @param [Google::Cloud::Spanner::V1::TransactionOptions::IsolationLevel] isolation_level The
+        #   isolation level for the transaction.
         # @param [Hash] commit_options A hash of commit options.
         #   e.g., return_commit_stats. Commit options are optional.
         #   The following options can be provided:
@@ -1251,10 +1269,12 @@ def update table, *rows,
         #
         def replace table, *rows,
                     transaction_id: nil, exclude_txn_from_change_streams: false,
-                    commit_options: nil, request_options: nil, call_options: nil
+                    isolation_level: nil, commit_options: nil, request_options: nil,
+                    call_options: nil
           opts = {
             transaction_id: transaction_id,
             exclude_txn_from_change_streams: exclude_txn_from_change_streams,
+            isolation_level: isolation_level,
             commit_options: commit_options,
             request_options: request_options,
             call_options: call_options
@@ -1279,6 +1299,8 @@ def replace table, *rows,
         # @param [Boolean] exclude_txn_from_change_streams If set to true,
         #   mutations will not be recorded in change streams with DDL option
         #   `allow_txn_exclusion=true`. Used if starting a new transaction.
+        # @param [Google::Cloud::Spanner::V1::TransactionOptions::IsolationLevel] isolation_level The
+        #   isolation level for the transaction.
         # @param [Hash] commit_options A hash of commit options.
         #   e.g., return_commit_stats. Commit options are optional.
         #   The following options can be provided:
@@ -1348,10 +1370,12 @@ def replace table, *rows,
         #
         def delete table, keys = [],
                    transaction_id: nil, exclude_txn_from_change_streams: false,
-                   commit_options: nil, request_options: nil, call_options: nil
+                   isolation_level: nil, commit_options: nil, request_options: nil,
+                   call_options: nil
           opts = {
             transaction_id: transaction_id,
             exclude_txn_from_change_streams: exclude_txn_from_change_streams,
+            isolation_level: isolation_level,
             commit_options: commit_options,
             request_options: request_options,
             call_options: call_options
diff --git a/google-cloud-spanner/test/google/cloud/spanner/client/commit_test.rb b/google-cloud-spanner/test/google/cloud/spanner/client/commit_test.rb
index d6415e1c..1f560484 100644
--- a/google-cloud-spanner/test/google/cloud/spanner/client/commit_test.rb
+++ b/google-cloud-spanner/test/google/cloud/spanner/client/commit_test.rb
@@ -37,6 +37,11 @@
     Google::Cloud::Spanner::V1::TransactionOptions.new read_write: Google::Cloud::Spanner::V1::TransactionOptions::ReadWrite.new,
                                                        exclude_txn_from_change_streams: true
   }
+  let(:tx_opts_isolation_level) { 
+    Google::Cloud::Spanner::V1::TransactionOptions.new read_write: Google::Cloud::Spanner::V1::TransactionOptions::ReadWrite.new,
+                                                       isolation_level: Google::Cloud::Spanner::V1::TransactionOptions::IsolationLevel::SERIALIZABLE
+
+  }
   let(:default_options) { ::Gapic::CallOptions.new metadata: { "google-cloud-resource-prefix" => database_path(instance_id, database_id) } }
   let(:client) { spanner.client instance_id, database_id, pool: { min: 0 } }
   let(:mutations) {
@@ -453,6 +458,28 @@
     mock.verify
   end
 
+  it "delete all rows directly while setting isolation level" do
+    mutations = [
+      Google::Cloud::Spanner::V1::Mutation.new(
+        delete: Google::Cloud::Spanner::V1::Mutation::Delete.new(
+          table: "users", key_set: Google::Cloud::Spanner::V1::KeySet.new(all: true)
+        )
+      )
+    ]
+
+    mock = Minitest::Mock.new
+    mock.expect :create_session, session_grpc, [{database: database_path(instance_id, database_id), session: nil}, default_options]
+    mock.expect :commit, commit_resp, [{ session: session_grpc.name, mutations: mutations, transaction_id: nil, single_use_transaction: tx_opts_isolation_level, request_options: nil }, default_options]
+    spanner.service.mocked_service = mock
+
+    timestamp = client.delete "users", [], isolation_level: Google::Cloud::Spanner::V1::TransactionOptions::IsolationLevel::SERIALIZABLE
+    _(timestamp).must_equal commit_time
+
+    shutdown_client! client
+
+    mock.verify
+  end
+
   describe "commit options" do
     let(:commit_options) { { return_commit_stats: true } }
 
@@ -724,4 +751,4 @@ def mock_commit_request mutations, request_options: nil
     mock.verify
     shutdown_client! client
   end
-end
\ No newline at end of file
+end
diff --git a/google-cloud-spanner/test/google/cloud/spanner/service_test.rb b/google-cloud-spanner/test/google/cloud/spanner/service_test.rb
index b9d5f1dd..829a8d25 100644
--- a/google-cloud-spanner/test/google/cloud/spanner/service_test.rb
+++ b/google-cloud-spanner/test/google/cloud/spanner/service_test.rb
@@ -125,6 +125,27 @@
       mocked_service.verify
       assert_equal expected_result, result
     end
+
+    it "sets the isolation_level field" do
+      mocked_service = Minitest::Mock.new
+      expected_request = {
+        session: session_id,
+        transaction_id: nil,
+        single_use_transaction: Google::Cloud::Spanner::V1::TransactionOptions.new(
+          read_write: Google::Cloud::Spanner::V1::TransactionOptions::ReadWrite.new,
+          isolation_level: Google::Cloud::Spanner::V1::TransactionOptions::IsolationLevel::SERIALIZABLE
+        ),
+        mutations: [],
+        request_options: nil
+      }
+      expected_result = Object.new
+      mocked_service.expect :commit, expected_result, [expected_request, expected_call_opts]
+      basic_service.mocked_service = mocked_service
+      result = basic_service.commit session_id, [], isolation_level: Google::Cloud::Spanner::V1::TransactionOptions::IsolationLevel::SERIALIZABLE
+      mocked_service.verify
+      assert_equal expected_result, result
+    end
+
   end
 
   describe "#create_pdml" do
diff --git a/google-cloud-spanner/test/google/cloud/spanner/session/commit_test.rb b/google-cloud-spanner/test/google/cloud/spanner/session/commit_test.rb
index 074fcd4d..f6425478 100644
--- a/google-cloud-spanner/test/google/cloud/spanner/session/commit_test.rb
+++ b/google-cloud-spanner/test/google/cloud/spanner/session/commit_test.rb
@@ -28,6 +28,11 @@
     Google::Cloud::Spanner::V1::TransactionOptions.new read_write: Google::Cloud::Spanner::V1::TransactionOptions::ReadWrite.new,
                                                        exclude_txn_from_change_streams: true
   }
+  let(:tx_opts_isolation_level) { 
+    Google::Cloud::Spanner::V1::TransactionOptions.new read_write: Google::Cloud::Spanner::V1::TransactionOptions::ReadWrite.new,
+                                                       isolation_level: Google::Cloud::Spanner::V1::TransactionOptions::IsolationLevel::REPEATABLE_READ
+
+  }     
   let(:default_options) { ::Gapic::CallOptions.new metadata: { "google-cloud-resource-prefix" => database_path(instance_id, database_id) } }
 
   it "commits using a block" do
@@ -288,4 +293,24 @@
 
     mock.verify
   end
+
+  it "passes isolation_level" do
+    mutations = [
+      Google::Cloud::Spanner::V1::Mutation.new(
+        delete: Google::Cloud::Spanner::V1::Mutation::Delete.new(
+          table: "users", key_set: Google::Cloud::Spanner::V1::KeySet.new(all: true)
+        )
+      )
+    ]
+
+    mock = Minitest::Mock.new
+    mock.expect :commit, commit_resp, [{ session: session.path, mutations: mutations, transaction_id: nil, single_use_transaction: tx_opts_isolation_level, request_options: nil }, default_options]
+    session.service.mocked_service = mock
+
+    timestamp = session.delete "users", isolation_level: Google::Cloud::Spanner::V1::TransactionOptions::IsolationLevel::REPEATABLE_READ
+
+    _(timestamp).must_equal commit_time
+
+    mock.verify
+  end
 end