tests: add integration and unit test for getTransaction options prope…

…rties

system-test/spanner.ts

@@ -8894,6 +8894,26 @@ describe('Spanner', () => {
         mismatchedColumnError(done, DATABASE, googleSqlTable);
       });
 
+      it('GOOGLE_STANDARD_SQL should use getTransaction for executing sql', async () => {
+        const promise = await DATABASE.getTransaction({optimisticLock: true});
+        const transaction = promise[0];
+
+        try {
+          const [rows] = await transaction!.run('SELECT * FROM TxnTable');
+          assert.strictEqual(rows.length, googleSqlRecords.length);
+        }
+        catch (err) {
+          if ((err as grpc.ServiceError).code === grpc.status.ABORTED) {
+            assert.ok(err, "Transaction is aborted");
+          } else {
+            console.log("ERROR: ", err);
+          }
+        }
+        finally{
+          transaction.end();
+        }
+      });
+
       it('POSTGRESQL should throw an error for mismatched columns', function (done) {
         if (IS_EMULATOR_ENABLED) {
           this.skip();

test/spanner.ts

@@ -3286,9 +3286,9 @@ describe('Spanner with mock server', () => {
       });
     });
 
-    it('should use optimistic lock for getTransaction', async () => {
+    it('should use optimistic lock and transaction tag for getTransaction', async () => {
       const database = newTestDatabase();
-      const promise = await database.getTransaction({optimisticLock: true});
+      const promise = await database.getTransaction({optimisticLock: true, requestOptions: {transactionTag: 'transaction-tag'}});
       const transaction = promise[0];
       await transaction.run('SELECT 1').then(results => {
         const request = spannerMock.getRequests().find(val => {
@@ -3299,6 +3299,9 @@ describe('Spanner with mock server', () => {
           request.transaction!.begin!.readWrite!.readLockMode,
           'OPTIMISTIC'
         );
+        assert.strictEqual(
+          request.requestOptions?.transactionTag, 'transaction-tag'
+        );
       });
     });