code: def test_pyspark_data_source():
      class TestDataSource(PySparkDataSource):
          data_source_unique_id = "test_unique_id"
          data_source_name = "test_source_name"
  
          def read_data(self, spark, params) -> DataFrame:
              return None
  
      test_data_source = TestDataSource()
  
      assert test_data_source.data_source_name == "test_source_name"
      assert test_data_source.data_source_unique_id == "test_unique_id"
      assert test_data_source.read_data(spark=None, params=None) is None
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_pyspark_data_source() and returns: None