How to use unittest module ?

[binhduonggttn]

I have a YAML config file and a Python ConfigManager file used to check connection to database. I need to write some test cases for my ConfigManager file :

1. If the database is none then test case fails.
2. If the database is Sqlite or Postgre, test case pass, otherwise it fails
I have created a test class but I don't know how to implement it. Can anyone suggest to me ?

DatabaseConfig.yml:

database:  #if it is empty or not sqlite or not postgre then it fails

dbopt:
   host: 
   port: 5432
   dbname: db1
   

ConfigManager.py:

import yaml

class InvalidConfigError(Exception):
    pass

class DB():
    def __init__(self, dbconf):
        self._dbconf = dict(dbconf)
        
        # checking for database type
        dbtype = self.get_db_type()
        if dbtype != 'sqlite' and dbtype != 'postgres':
            raise InvalidConfigError(
                'E01001', 'Invalid database type, should be sqlite or postgres.')
        else:
            self.dbtype = dbtype

    def get_db_type(self):
        return self._dbconf['database']

with open('DatabaseConfig.yml') as file:
    data = yaml.full_load(file)

    for item, doc in data.items():
        print(item, ":", doc)

    db = DB(data)

My test file test_database.py (help me with this) :

import unittest
from database_config import DB

class TestDatabase(unittest.TestCase):

    def test_missing_db(self):
             # test database is none then it fail
    def test_db_type_postgres(self):
             # test if database is postgres then it pass
    def test_db_type_sqlite(self):
             # test if database is sqlite then it pass
    def test_db_type_invalid(self):
             # test if database is not postgres or sqlite then it fail
if __name__ == '__main__':
    unittest.main()

[Larz60+]

suggest you read: https://docs.python.org/3/library/unittest.html