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()

[jim2007]

In a nutshell create an instance of the class and check that whatever should have been performed were in fact carried out. Check if properties were correctly set, do method return the correct values and so on.

[Larz60+]

you have:

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

why not just?:

class DataSinkConfig():
    def __init__(self, dbconf):
 
        insopt = dbconf.get('insopt')
        if insopt is None:
            self.entries_table_name = 'entries'
            self.outliers_table_name = 'outliers'
            self.outlier_causes_table_name = 'outlier_causes'