Source:
<code>public final void testConsumeShardInitializedWithPendingCheckpoint() throws Exception { ShardInfo shardInfo = new ShardInfo("s-0-0", "testToken", null, ExtendedSequenceNumber.TRIM_HORIZON); StreamConfig streamConfig = new StreamConfig(streamProxy, 1, 10, callProcessRecordsForEmptyRecordList, skipCheckpointValidationValue, INITIAL_POSITION_LATEST); ShardConsumer consumer = new ShardConsumer(shardInfo, streamConfig, checkpoint, processor, null, parentShardPollIntervalMillis, cleanupLeasesOfCompletedShards, executorService, metricsFactory, taskBackoffTimeMillis, KinesisClientLibConfiguration.DEFAULT_SKIP_SHARD_SYNC_AT_STARTUP_IF_LEASES_EXIST); final ExtendedSequenceNumber checkpointSequenceNumber = new ExtendedSequenceNumber("123"); final ExtendedSequenceNumber pendingCheckpointSequenceNumber = new ExtendedSequenceNumber("999"); when(leaseManager.getLease(anyString())).thenReturn(null); when(checkpoint.getCheckpointObject(anyString())).thenReturn( new Checkpoint(checkpointSequenceNumber, pendingCheckpointSequenceNumber)); assertThat(consumer.getCurrentState(), is(equalTo(ConsumerStates.ShardConsumerState.WAITING_ON_PARENT_SHARDS))); consumer.consumeShard(); Thread.sleep(50L); assertThat(consumer.getCurrentState(), is(equalTo(ConsumerStates.ShardConsumerState.WAITING_ON_PARENT_SHARDS))); verify(processor, times(0)).initialize(any(InitializationInput.class)); consumer.consumeShard(); Thread.sleep(50L); assertThat(consumer.getCurrentState(), is(equalTo(ConsumerStates.ShardConsumerState.INITIALIZING))); <START> verify(processor, times(1)).initialize(argThat(new ArgumentMatcher<InitializationInput>() { <END> @Override public boolean matches(Object argument) { if (argument instanceof InitializationInput) { InitializationInput initializationInput = (InitializationInput) argument; return Objects.equals(checkpointSequenceNumber, initializationInput.getExtendedSequenceNumber()) && Objects.equals(pendingCheckpointSequenceNumber, initializationInput.getPendingCheckpointSequenceNumber()); } return false; } })); consumer.consumeShard(); Thread.sleep(50L); assertThat(consumer.getCurrentState(), is(equalTo(ConsumerStates.ShardConsumerState.PROCESSING))); }</code><technical_language>[TypeSafeMatcher](<LINK_0> this easier</technical_language>

Target:
public final void testConsumeShardInitializedWithPendingCheckpoint() throws Exception { ShardInfo shardInfo = new ShardInfo("s-0-0", "testToken", null, ExtendedSequenceNumber.TRIM_HORIZON); StreamConfig streamConfig = new StreamConfig(streamProxy, 1, 10, callProcessRecordsForEmptyRecordList, skipCheckpointValidationValue, INITIAL_POSITION_LATEST); ShardConsumer consumer = new ShardConsumer(shardInfo, streamConfig, checkpoint, processor, null, parentShardPollIntervalMillis, cleanupLeasesOfCompletedShards, executorService, metricsFactory, taskBackoffTimeMillis, KinesisClientLibConfiguration.DEFAULT_SKIP_SHARD_SYNC_AT_STARTUP_IF_LEASES_EXIST); final ExtendedSequenceNumber checkpointSequenceNumber = new ExtendedSequenceNumber("123"); final ExtendedSequenceNumber pendingCheckpointSequenceNumber = new ExtendedSequenceNumber("999"); when(leaseManager.getLease(anyString())).thenReturn(null); when(checkpoint.getCheckpointObject(anyString())).thenReturn( new Checkpoint(checkpointSequenceNumber, pendingCheckpointSequenceNumber)); assertThat(consumer.getCurrentState(), is(equalTo(ConsumerStates.ShardConsumerState.WAITING_ON_PARENT_SHARDS))); consumer.consumeShard(); Thread.sleep(50L); assertThat(consumer.getCurrentState(), is(equalTo(ConsumerStates.ShardConsumerState.WAITING_ON_PARENT_SHARDS))); verify(processor, times(0)).initialize(any(InitializationInput.class)); consumer.consumeShard(); Thread.sleep(50L); assertThat(consumer.getCurrentState(), is(equalTo(ConsumerStates.ShardConsumerState.INITIALIZING))); verify(processor, times(1)).initialize(argThat( initializationInputMatcher(checkpointSequenceNumber, pendingCheckpointSequenceNumber))); verify(processor, times(1)).initialize(any(InitializationInput.class)); consumer.consumeShard(); Thread.sleep(50L); assertThat(consumer.getCurrentState(), is(equalTo(ConsumerStates.ShardConsumerState.PROCESSING))); }