### Question:
DiffGeneratedPartitionPredicate implements PartitionPredicate { @Override public String getPartitionPredicate() { if (!generated) { partitionPredicate = generate(); generated = true; } return partitionPredicate; } DiffGeneratedPartitionPredicate(
      @Nonnull HiveEndpoint source,
      @Nonnull HiveEndpoint replica,
      TableReplication tableReplication,
      Function<Path, String> checksumFunction); @Override String getPartitionPredicate(); @Override short getPartitionPredicateLimit();  }### Answer:
@Test public void autogeneratePredicate() throws Exception { when(replica.getTableAndStatistics(tableReplication)).thenReturn(replicaTableAndStats); when(replicaTableAndStats.getTable()).thenReturn(table2); when(sourceTable.getPartitionLimit()).thenReturn((short) 10); predicate = new DiffGeneratedPartitionPredicate(source, replica, tableReplication, checksumFunction); assertThat(predicate.getPartitionPredicate(), is("(p1='value11' AND p2='value22') OR (p1='value1' AND p2='value2')")); }
@Test public void autogeneratePredicateReplicaTableDoesNotExist() throws Exception { when(replica.getTableAndStatistics(tableReplication)).thenThrow(new CircusTrainException("Table does not exist!")); when(sourceTable.getPartitionLimit()).thenReturn((short) 10); predicate = new DiffGeneratedPartitionPredicate(source, replica, tableReplication, checksumFunction); assertThat(predicate.getPartitionPredicate(), is("(p1='value11' AND p2='value22') OR (p1='value1' AND p2='value2')")); }