fix: run processing ack may not be able to start on time in test (#237)

Author: KirillKurdyukov

src/Ydb.Sdk/tests/Topic/WriterUnitTests.cs

@@ -130,9 +130,9 @@ public async Task Initialize_WhenFailWriteMessage_ShouldRetryInitializeAndReturn
         Assert.Equal(PersistenceStatus.Written, (await writer.WriteAsync("abacaba")).Status);
 
         // check attempt repeated!!!
-        _mockStream.Verify(stream => stream.Write(It.IsAny<FromClient>()),
+        _mockStream.Verify(stream => stream.Write(It.IsAny<FromClient>()), Times.Exactly(3));
+        _mockStream.Verify(stream => stream.MoveNextAsync(),
             Times.AtLeast(2)); // run processing ack may not be able to start on time 
-        _mockStream.Verify(stream => stream.MoveNextAsync(), Times.Exactly(3));
         _mockStream.Verify(stream => stream.Current, Times.Exactly(2));
     }