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test.py
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test.py
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import sys
import unittest
try:
from StringIO import StringIO
except ModuleNotFoundError:
from io import StringIO
try:
from unittest.mock import patch
except ImportError:
from mock import patch
from data_base import DataBase, call_method, main, HELP
class MockForTest(object):
def some_method(self, args):
return 'success'
class DataBaseTest(unittest.TestCase):
def setUp(self):
self.database = DataBase()
def test_set(self):
self.database.SET('A', '10')
self.assertEqual(self.database._storage, {'A': '10'})
def test_set_twice(self):
self.database.SET('A', '10')
self.database.SET('A', '10')
self.assertEqual(self.database._storage, {'A': '10'})
def test_set_two_values(self):
self.database.SET('A', '10')
self.database.SET('B', '10')
self.assertEqual(self.database._storage, {'A': '10', 'B': '10'})
def test_set_in_transaction(self):
self.database._storage = {'A': '10'}
self.database._transaction_number = 1
self.database._rollback_cache[1] = []
self.database.SET('B', '20')
self.assertEqual(self.database._storage, {'A': '10', 'B': '20'})
self.assertEqual(self.database._rollback_cache,
{1: [('UNSET', 'B')]})
def test_set_in_transaction_twice(self):
self.database._storage = {'A': '10'}
self.database._transaction_number = 1
self.database._rollback_cache[1] = []
self.database.SET('B', '20')
self.database.SET('B', '20')
self.assertEqual(self.database._storage, {'A': '10', 'B': '20'})
self.assertEqual(self.database._rollback_cache,
{1: [('UNSET', 'B'), ('SET', 'B', '20')]})
def test_set_in_transaction_rolling_back(self):
self.database._storage = {'A': '10'}
self.database._transaction_number = 1
self.database._rollback_cache[1] = []
self.database._rolling_back = True
self.database.SET('B', '20')
self.assertEqual(self.database._storage, {'A': '10', 'B': '20'})
self.assertEqual(self.database._rollback_cache, {1: []})
def test_get(self):
self.database._storage = {'A': '10'}
capturedOutput = StringIO()
sys.stdout = capturedOutput
self.database.GET('A')
sys.stdout = sys.__stdout__
self.assertEqual(capturedOutput.getvalue(), '10\n')
def test_get_null(self):
capturedOutput = StringIO()
sys.stdout = capturedOutput
self.database.GET('A')
sys.stdout = sys.__stdout__
self.assertEqual(capturedOutput.getvalue(), 'NULL\n')
def test_unset(self):
self.database._storage = {'A': '10'}
self.database.UNSET('A')
self.assertEqual(self.database._storage, {})
def test_unset_no_key(self):
self.database._storage = {}
self.database.UNSET('A')
self.assertEqual(self.database._storage, {})
def test_unset_in_transaction(self):
self.database._storage = {'A': '10'}
self.database._transaction_number = 1
self.database._rollback_cache[1] = []
self.database.UNSET('A')
self.assertEqual(self.database._storage, {})
self.assertEqual(self.database._rollback_cache,
{1: [('SET', 'A', '10')]})
def test_unset_in_transaction_twice(self):
self.database._storage = {'A': '10'}
self.database._transaction_number = 1
self.database._rollback_cache[1] = []
self.database.UNSET('A')
self.database.UNSET('A')
self.assertEqual(self.database._storage, {})
self.assertEqual(self.database._rollback_cache,
{1: [('SET', 'A', '10')]})
def test_unset_in_transaction_rolling_back(self):
self.database._storage = {'A': '10'}
self.database._transaction_number = 1
self.database._rollback_cache[1] = []
self.database._rolling_back = True
self.database.UNSET('A')
self.assertEqual(self.database._storage, {})
self.assertEqual(self.database._rollback_cache, {1: []})
def test_counts(self):
self.database._storage = {'A': '10'}
capturedOutput = StringIO()
sys.stdout = capturedOutput
self.database.COUNTS('10')
sys.stdout = sys.__stdout__
self.assertEqual(capturedOutput.getvalue(), '1\n')
def test_counts_no_value(self):
self.database._storage = {'A': '11'}
capturedOutput = StringIO()
sys.stdout = capturedOutput
self.database.COUNTS('10')
sys.stdout = sys.__stdout__
self.assertEqual(capturedOutput.getvalue(), '0\n')
def test_counts_two_values(self):
self.database._storage = {'A': '10', 'B': '10'}
capturedOutput = StringIO()
sys.stdout = capturedOutput
self.database.COUNTS('10')
sys.stdout = sys.__stdout__
self.assertEqual(capturedOutput.getvalue(), '2\n')
def test_find(self):
self.database._storage = {'A': '10'}
capturedOutput = StringIO()
sys.stdout = capturedOutput
self.database.FIND('10')
sys.stdout = sys.__stdout__
self.assertEqual(capturedOutput.getvalue(), 'A\n')
def test_find_no_value(self):
self.database._storage = {'A': '11'}
capturedOutput = StringIO()
sys.stdout = capturedOutput
self.database.FIND('10')
sys.stdout = sys.__stdout__
self.assertEqual(capturedOutput.getvalue(), '\n')
def test_find_two_values(self):
self.database._storage = {'A': '10', 'B': '10'}
capturedOutput = StringIO()
sys.stdout = capturedOutput
self.database.FIND('10')
sys.stdout = sys.__stdout__
self.assertEqual(capturedOutput.getvalue(), 'A B\n')
def test_begin(self):
self.assertEqual(self.database._transaction_number, 0)
self.assertEqual(self.database._rollback_cache, {})
self.database.BEGIN()
self.assertEqual(self.database._transaction_number, 1)
self.assertEqual(self.database._rollback_cache, {1: []})
def test_begin_twice(self):
self.assertEqual(self.database._transaction_number, 0)
self.assertEqual(self.database._rollback_cache, {})
self.database.BEGIN()
self.assertEqual(self.database._transaction_number, 1)
self.assertEqual(self.database._rollback_cache, {1: []})
self.database.BEGIN()
self.assertEqual(self.database._transaction_number, 2)
self.assertEqual(self.database._rollback_cache, {1: [], 2: []})
def test_rollback(self):
self.assertEqual(self.database._transaction_number, 0)
self.assertEqual(self.database._rollback_cache, {})
self.assertEqual(self.database._rolling_back, False)
self.database._transaction_number = 1
self.database._storage = {'A': '10', 'B': '10'}
self.database._rollback_cache = {1: [('UNSET', 'B')]}
self.database.ROLLBACK()
self.assertEqual(self.database._transaction_number, 0)
self.assertEqual(self.database._rollback_cache, {})
self.assertEqual(self.database._rolling_back, False)
self.assertEqual(self.database._storage, {'A': '10'})
def test_rollback_same_key_edited_twice(self):
self.assertEqual(self.database._transaction_number, 0)
self.assertEqual(self.database._rollback_cache, {})
self.assertEqual(self.database._rolling_back, False)
self.database._transaction_number = 1
self.database._storage = {'A': '10'}
self.database._rollback_cache = {1: [('UNSET', 'B'),
('SET', 'B', '10')]}
self.database.ROLLBACK()
self.assertEqual(self.database._transaction_number, 0)
self.assertEqual(self.database._rollback_cache, {})
self.assertEqual(self.database._rolling_back, False)
self.assertEqual(self.database._storage, {'A': '10'})
def test_rollback_nested(self):
self.assertEqual(self.database._transaction_number, 0)
self.assertEqual(self.database._rollback_cache, {})
self.assertEqual(self.database._rolling_back, False)
self.database._transaction_number = 2
self.database._storage = {'A': '10', 'B': '10'}
self.database._rollback_cache = {1: [('UNSET', 'B')],
2: [('SET', 'C', '3')]}
self.database.ROLLBACK()
self.assertEqual(self.database._transaction_number, 1)
self.assertEqual(self.database._rollback_cache, {1: [('UNSET', 'B')]})
self.assertEqual(self.database._rolling_back, False)
self.assertEqual(self.database._storage,
{'A': '10', 'C': '3', 'B': '10'})
def test_commit(self):
self.database._transaction_number = 1
self.database._rollback_cache = {1: [('UNSET', 'B')]}
self.database.COMMIT()
self.assertEqual(self.database._transaction_number, 0)
self.assertEqual(self.database._rollback_cache, {})
class CallMethodTest(unittest.TestCase):
def setUp(self):
self.test_instance = MockForTest()
def test_call_method(self):
result = call_method(self.test_instance, ['some_method', '1'])
self.assertTrue(result)
def test_call_method_invalid_name(self):
capturedOutput = StringIO()
sys.stdout = capturedOutput
result = call_method(self.test_instance, ['invalid_method', '1'])
self.assertFalse(result)
sys.stdout = sys.__stdout__
self.assertEqual(
capturedOutput.getvalue(),
' -> Invalid method name. To get methods names type HELP.\n'
)
def test_call_method_invalid_args_number(self):
capturedOutput = StringIO()
sys.stdout = capturedOutput
result = call_method(self.test_instance, ['some_method'])
self.assertFalse(result)
sys.stdout = sys.__stdout__
self.assertEqual(
capturedOutput.getvalue(),
' -> Invalid number of argumets for some_method\n'
)
class MainTest(unittest.TestCase):
@patch('data_base.call_method')
@patch('data_base.input')
def test_main(self, mock_input, mock_call_method):
mock_input.side_effect = ['METHOD', 'END']
mock_call_method.return_value = sys.exit
capturedOutput = StringIO()
sys.stdout = capturedOutput
main()
sys.stdout = sys.__stdout__
self.assertEqual(
capturedOutput.getvalue(),
('Welcome to simple database! Type HELP for help.\n'
'Exiting database...\n')
)
@patch('data_base.call_method')
@patch('data_base.input')
def test_main_help(self, mock_input, mock_call_method):
mock_input.side_effect = ['HELP', 'END']
mock_call_method.return_value = sys.exit
capturedOutput = StringIO()
sys.stdout = capturedOutput
main()
sys.stdout = sys.__stdout__
self.assertEqual(
capturedOutput.getvalue(),
('Welcome to simple database! Type HELP for help.\n' +
HELP + '\n' +
'Exiting database...\n')
)
if __name__ == '__main__':
unittest.main()