BufferedStreamConsumerTest: remove non-determinism in size of generated test records (#9274)

* generate records fixed 40 bytes of size

* fix buffer flush

Signed-off-by: Sergey Chvalyuk <[email protected]>

Author: grubberr

airbyte-integrations/bases/base-java/src/main/java/io/airbyte/integrations/destination/buffered_stream_consumer/BufferedStreamConsumer.java

@@ -147,7 +147,7 @@ protected void acceptTracked(final AirbyteMessage message) throws Exception {
       // are serialized again when writing to
       // the destination
       long messageSizeInBytes = ByteUtils.getSizeInBytesForUTF8CharSet(Jsons.serialize(recordMessage.getData()));
-      if (bufferSizeInBytes + messageSizeInBytes >= maxQueueSizeInBytes) {
+      if (bufferSizeInBytes + messageSizeInBytes > maxQueueSizeInBytes) {
         LOGGER.info("Flushing buffer...");
         flushQueueToDestination();
         bufferSizeInBytes = 0;

airbyte-integrations/bases/base-java/src/test/java/io/airbyte/integrations/destination/buffered_stream_consumer/BufferedStreamConsumerTest.java

@@ -315,7 +315,7 @@ private static List<AirbyteMessage> generateRecords(final long targetSizeInBytes
     List<AirbyteMessage> output = Lists.newArrayList();
     long bytesCounter = 0;
     for (int i = 0;; i++) {
-      JsonNode payload = Jsons.jsonNode(ImmutableMap.of("id", RandomStringUtils.randomAscii(7), "name", "human " + String.format("%5d", i)));
+      JsonNode payload = Jsons.jsonNode(ImmutableMap.of("id", RandomStringUtils.randomAlphabetic(7), "name", "human " + String.format("%8d", i)));
       long sizeInBytes = ByteUtils.getSizeInBytesForUTF8CharSet(Jsons.serialize(payload));
       bytesCounter += sizeInBytes;
       AirbyteMessage airbyteMessage = new AirbyteMessage()