code: def test_for_monotonous_timestamps(self):
      jvm = get_gateway().jvm
      j_watermark_strategy = (
          WatermarkStrategy.for_monotonous_timestamps()._j_watermark_strategy
      )
      self.assertTrue(
          is_instance_of(
              j_watermark_strategy.createWatermarkGenerator(None),
              jvm.org.apache.flink.api.common.eventtime.AscendingTimestampsWatermarks,
          )
      )
  
file_path: flink/flink-python/pyflink/common/tests/test_watermark_strategy.py
imports: from pyflink.common import Duration
  from pyflink.common.watermark_strategy import WatermarkStrategy
  from pyflink.java_gateway import get_gateway
  from pyflink.util.java_utils import is_instance_of, get_field_value
  from pyflink.testing.test_case_utils import PyFlinkTestCase
label_desc: Use image node_id 3 for calling the WatermarkStrategyTests obj's underlying member method code with example usage: obj.test_for_monotonous_timestamps() without return types