fix(test): fix flaky test (#1633)

* fix(test): fix flaky test

The expectation list needs to be thread safe as it could be accessed from multiple grpc server threads

Change-Id: I74be5cd433fc31963b1c22091216dffa1ef9c55e

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* missing import

Change-Id: Ide19ef7ba2f29b1bb9d3fc211d652567c53fdbfb

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

google-cloud-bigtable/src/test/java/com/google/cloud/bigtable/data/v2/stub/readrows/ReadRowsRetryTest.java

@@ -34,7 +34,6 @@
 import com.google.cloud.bigtable.data.v2.models.Range.ByteStringRange;
 import com.google.cloud.bigtable.data.v2.models.Row;
 import com.google.common.collect.Lists;
-import com.google.common.collect.Queues;
 import com.google.common.collect.Range;
 import com.google.common.truth.Truth;
 import com.google.protobuf.ByteString;
@@ -48,6 +47,7 @@
 import java.io.IOException;
 import java.util.List;
 import java.util.Queue;
+import java.util.concurrent.LinkedBlockingDeque;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Rule;
@@ -300,7 +300,7 @@ private List<String> getResults(Query query) {
   }
 
   private static class TestBigtableService extends BigtableGrpc.BigtableImplBase {
-    Queue<RpcExpectation> expectations = Queues.newArrayDeque();
+    Queue<RpcExpectation> expectations = new LinkedBlockingDeque<>();
     int i = -1;
 
     @Override