How to write test cases for a init function by Unit test in python?

[binhduonggttn]

I'm new in Python. I have a __init__ function with information about data sink config and I have to write some test cases fot it. But init is a function which doesn't return any result so it confuses me. Can you show me some ways to implement test case for it ? Thank you.

My function :

class DataSinkConfig():
    DEFAULT_ENTRIES_TABLE = 'entries'
    DEFAULT_OUTLIERS_TABLE = 'outliers'
    DEFAULT_OUTLIERCAUSES_TABLE = 'outlier_causes'

    # Note
    def __init__(self, dbconf):

        insopt = dbconf.get('insopt')
        if insopt is None:
            self.entries_table_name = self.DEFAULT_ENTRIES_TABLE
            self.outliers_table_name = self.DEFAULT_OUTLIERS_TABLE
            self.outlier_causes_table_name = self.DEFAULT_OUTLIERCAUSES_TABLE
        else:
            try:
                dict(insopt)
            except Exception as e:
                raise Exception(
                    "Invalid value {} for parameter 'insopt'.".format(insopt))

            self.entries_table_name = self.__complement_item(insopt, 'entry_tbl', self.DEFAULT_ENTRIES_TABLE)
            self.outliers_table_name = self.__complement_item(insopt, 'outlier_tbl', self.DEFAULT_OUTLIERS_TABLE)
            self.outlier_causes_table_name = self.__complement_item(insopt, 'cause_tbl', self.DEFAULT_OUTLIERCAUSES_TABLE)

My test is stuck :

import unittest
import DataSinkConfig, DataSourceConfig

class TestDataSink(unittest.TestCase):
    def setUp(self):
      #pass

if __name__ == "__main__":
    unittest.main()