org.mockito.exceptions.verification.TooFewActualInvocations: abstractStorageEngine.put( 1, [(byte) 0x01, (byte) 0x4B, (byte) 0x65, (byte) 0x79, (byte) 0x46, (byte) 0x6F, (byte) 0x72, (byte) 0x50, (byte) 0x61, (byte) 0x72, (byte) 0x74, (byte) 0x69, (byte) 0x74, (byte) 0x69, (byte) 0x6F, (byte) 0x6E, (byte) 0x31, (byte) 0x5F, (byte) 0x32, (byte) 0x31, (byte) 0x37, (byte) 0x39, (byte) 0x39, (byte) 0x61, (byte) 0x35, (byte) 0x63, (byte) 0x66, (byte) 0x30, (byte) 0x5F, (byte) 0x64, (byte) 0x37, (byte) 0x32, (byte) 0x62, (byte) 0x35, (byte) 0x31, (byte) 0x33, (byte) 0x34], java.nio.HeapByteBuffer[pos=0 lim=17 cap=17] ); Wanted 2 times: -> at com.linkedin.davinci.store.AbstractStorageEngine.put(AbstractStorageEngine.java:478) But was 1 time: -> at com.linkedin.davinci.kafka.consumer.DeepCopyStorageEngine.put(DeepCopyStorageEngine.java:39)