chore(spanner): lint fix

Author: harshachinta

google-cloud-spanner/src/test/java/com/google/cloud/spanner/AsyncRunnerTest.java

@@ -20,7 +20,6 @@
 import static com.google.common.truth.Truth.assertThat;
 import static org.junit.Assert.assertThrows;
 import static org.junit.Assert.assertTrue;
-import static org.junit.Assume.assumeFalse;
 
 import com.google.api.core.ApiFuture;
 import com.google.api.core.ApiFutures;

google-cloud-spanner/src/test/java/com/google/cloud/spanner/it/ITLargeReadTest.java

@@ -101,6 +101,7 @@ public static void setUpDatabase() {
                         + ")"));
     postgreSQLClient = env.getTestHelper().getDatabaseClient(postgreSQLDatabase);
     hasher = Hashing.goodFastHash(64);
+
     List<Mutation> mutations = new ArrayList<>();
     Random rnd = new Random();
     int totalSize = 0;

google-cloud-spanner/src/test/java/com/google/cloud/spanner/it/ITTransactionTest.java

@@ -474,6 +474,7 @@ public void nestedTxnSucceedsWhenAllowed() {
         .run(
             transaction -> {
               client.singleUseReadOnlyTransaction();
+
               return null;
             });
   }