snuyanzin commented on code in PR #27:
URL: 
https://github.com/apache/flink-connector-gcp-pubsub/pull/27#discussion_r1601876558


##########
flink-connector-gcp-pubsub/src/test/java/org/apache/flink/connector/gcp/pubsub/sink/PubSubWriterTest.java:
##########
@@ -0,0 +1,245 @@
+package org.apache.flink.connector.gcp.pubsub.sink;
+
+import org.apache.flink.api.common.serialization.SimpleStringSchema;
+import org.apache.flink.api.connector.sink2.WriterInitContext;
+import org.apache.flink.connector.base.sink.writer.TestSinkInitContext;
+import 
org.apache.flink.connector.base.sink.writer.TestSinkInitContextAnyThreadMailbox;
+import org.apache.flink.connector.gcp.pubsub.sink.util.TestGcpWriterClient;
+import org.apache.flink.metrics.Counter;
+import org.apache.flink.util.FlinkRuntimeException;
+
+import com.google.protobuf.ByteString;
+import com.google.pubsub.v1.PubsubMessage;
+import io.grpc.StatusRuntimeException;
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+import java.util.concurrent.CountDownLatch;
+
+/** Tests for {@link PubSubWriter}. */
+public class PubSubWriterTest {
+
+    private static final int MAXIMUM_INFLIGHT_MESSAGES = 3;
+
+    @Test
+    void writeMessageDeliversMessageUsingClient() throws IOException, 
InterruptedException {
+        TestGcpWriterClient client = new TestGcpWriterClient();
+        PubSubWriter<String> writer =
+                getDefaultWriter(client, new TestSinkInitContext(), 
MAXIMUM_INFLIGHT_MESSAGES);
+        String message = "test-message";
+        writer.write(message, null);
+        client.deliverMessage(message);
+        writer.flush(false);
+
+        
Assertions.assertThat(client.getDeliveredMessages()).containsExactly(message);

Review Comment:
   `static import`



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