def test_table_selects_simple_query_with_one_field(self):
table = Table('table_name', [
['id', 'first_name', 'last_name', 'country', 'year_of_birth', 'company'],
['1', 'John', 'Carmack', 'USA', '1970', 'id Software'],
['2', 'Jonn', 'Romero', 'USA', '1967', 'id Software'],
['3', 'Elon', 'Musk', 'USA', '1971', 'Tesla'],
['4', 'Damon', 'Hill', 'UK', '1960', 'Williams']
])
query = Query()
query.get_select_expression = MagicMock(return_value=['id'])
query.get_aggregate_function = MagicMock(return_value='')
query.get_where_clause = MagicMock(return_value=[])
self.assertEqual(table.select_rows(query), [['1'], ['2'], ['3'], ['4']])
def test_table_returns_correct_values(self):
table = Table('table_name', [
['id', 'first_name', 'last_name', 'country', 'year_of_birth', 'company'],
['1', 'John', 'Carmack', 'USA', '1970', 'id Software'],
['2', 'Jonn', 'Romero', 'USA', '1967', 'id Software'],
['3', 'Elon', 'Musk', 'USA', '1971', 'Tesla'],
['4', 'Damon', 'Hill', 'UK', '1960', 'Williams']
])
self.assertEqual(table.get_name(), 'table_name')
self.assertEqual(table.get_column_names(),
['id', 'first_name', 'last_name', 'country', 'year_of_birth', 'company'])
self.assertEqual(table.get_rows(), [['1', 'John', 'Carmack', 'USA', '1970', 'id Software'],
['2', 'Jonn', 'Romero', 'USA', '1967', 'id Software'],
['3', 'Elon', 'Musk', 'USA', '1971', 'Tesla'],
['4', 'Damon', 'Hill', 'UK', '1960', 'Williams']])
def test_it_fills_aggregate_function_field(self):
query = Query()
query.set_aggregate_function = MagicMock()
database = Database('database_name', query)
database.add_table(Table('drivers', []))
database.proceed_query('SELECT COUNT(*) FROM drivers;')
query.set_aggregate_function.assert_called_once_with('COUNT(*)')
def test_database_proceed_filled_query_string_with_table_exist_fills_query_table_field(
self):
query = Query()
database = Database('database_name', query)
database.add_table(Table('drivers', []))
database.proceed_query('SELECT company, country FROM drivers;')
self.assertEqual(database.get_query().get_table(), 'drivers')
def test_it_returns_table(self):
reader = CSVReader()
table = Table('drivers', [
['id', 'first_name', 'last_name', 'country', 'year_of_birth', 'company'],
['1', 'John', 'Carmack', 'USA', '1970', 'id Software'],
['2', 'Jonn', 'Romero', 'USA', '1967', 'id Software'],
['3', 'Elon', 'Musk', 'USA', '1971', 'Tesla'],
['4', 'Damon', 'Hill', 'UK', '1960', 'Williams']
])
self.assertIsInstance(reader.read('./csvs/drivers.csv', 'drivers'), Table)
self.assertEqual('drivers', table.get_name())
self.assertEqual(['id', 'first_name', 'last_name', 'country', 'year_of_birth', 'company'],
table.get_column_names())
self.assertEqual([['1', 'John', 'Carmack', 'USA', '1970', 'id Software'],
['2', 'Jonn', 'Romero', 'USA', '1967', 'id Software'],
['3', 'Elon', 'Musk', 'USA', '1971', 'Tesla'],
['4', 'Damon', 'Hill', 'UK', '1960', 'Williams']], table.get_rows())
def test_database_setters(self):
query = Query()
query.set_table('tada')
table = Table('table_name', [])
error_text = 'some error'
database = Database('database_name', query)
database.add_table(table)
database.set_error(error_text)
self.assertEqual(database.get_name(), 'database_name')
self.assertEqual(database.get_tables(), {'table_name': table})
self.assertEqual(database.get_error(), error_text)
self.assertEqual(database.has_error(), True)
self.assertEqual(database.get_query(), query)
def test_it_fills_select_expression_with_multiple_fields(self):
query = Query()
table = Table('drivers', [[
'id', 'first_name', 'last_name', 'country', 'year_of_birth',
'company'
], ['1', 'John', 'Carmack', 'USA', '1970', 'id Software'
], ['2', 'Jonn', 'Romero', 'USA', '1967', 'id Software'
], ['3', 'Elon', 'Musk', 'USA', '1971', 'Tesla'
], ['4', 'Damon', 'Hill', 'UK', '1960', 'Williams']])
database = Database('database_name', query)
database.add_table(table)
database.proceed_query('SELECT first_name, last_name FROM drivers;')
self.assertEqual(database.get_query().get_select_expression(),
['first_name', 'last_name'])
def test_it_parses_simple_where_statement_with_existed_field(self):
query = Query()
table = Table('drivers', [[
'id', 'first_name', 'last_name', 'country', 'year_of_birth',
'company'
], ['1', 'John', 'Carmack', 'USA', '1970', 'id Software'
], ['2', 'Jonn', 'Romero', 'USA', '1967', 'id Software'
], ['3', 'Elon', 'Musk', 'USA', '1971', 'Tesla'
], ['4', 'Damon', 'Hill', 'UK', '1960', 'Williams']])
database = Database('database_name', query)
database.add_table(table)
database.proceed_query(
"SELECT first_name FROM drivers WHERE country = 'USA';")
self.assertEqual(database.get_query().get_where_clause(),
[('', 'country', 'USA')])
def test_it_shows_error_if_aggregate_function_witout_if_statement(self):
query = Query()
table = Table('drivers', [[
'id', 'first_name', 'last_name', 'country', 'year_of_birth',
'company'
], ['1', 'John', 'Carmack', 'USA', '1970', 'id Software'
], ['2', 'Jonn', 'Romero', 'USA', '1967', 'id Software'
], ['3', 'Elon', 'Musk', 'USA', '1971', 'Tesla'
], ['4', 'Damon', 'Hill', 'UK', '1960', 'Williams']])
database = Database('database_name', query)
database.add_table(table)
database.proceed_query('SELECT COUNT(*) FROM drivers;')
self.assertEqual(database.get_query().get_select_expression(), [])
self.assertEqual(
database.get_error(),
'Query contains aggregate function, but WHERE statement missed')
def test_it_parses_complicated_where_statement_with_second_non_existed_field(
self):
query = Query()
table = Table('drivers', [[
'id', 'first_name', 'last_name', 'country', 'year_of_birth',
'company'
], ['1', 'John', 'Carmack', 'USA', '1970', 'id Software'
], ['2', 'Jonn', 'Romero', 'USA', '1967', 'id Software'
], ['3', 'Elon', 'Musk', 'USA', '1971', 'Tesla'
], ['4', 'Damon', 'Hill', 'UK', '1960', 'Williams']])
database = Database('database_name', query)
database.add_table(table)
database.proceed_query(
"SELECT first_name FROM drivers WHERE country = 'USA' AND df = 'sdf';"
)
self.assertEqual(database.get_error(),
'Column from where_expression not found')
def test_init_with_database(self, input):
query = Query()
query.get_aggregate_function = MagicMock(return_value='COUNT(*)')
query.get_result = MagicMock(return_value=[3])
table = Table('drivers', [
['id', 'first_name', 'last_name', 'country', 'year_of_birth', 'company'],
['1', 'John', 'Carmack', 'USA', '1970', 'id Software'],
['2', 'Jonn', 'Romero', 'USA', '1967', 'id Software'],
['3', 'Elon', 'Musk', 'USA', '1971', 'Tesla'],
['4', 'Damon', 'Hill', 'UK', '1960', 'Williams']])
database = Database('database_name', query)
database.add_table(table)
controller = Controller()
with patch('sys.stdout', new=StringIO()) as fake_out:
controller.init(database)
self.assertEqual(fake_out.getvalue(), 'Tables found: 1\ndrivers\n')
def read(self, full_path: str, table_name: str) -> Table:
file_to_read = open(full_path, encoding='utf-8')
csv_data = csv.reader(file_to_read)
data_lines = list(csv_data)
return Table(table_name.lower(), data_lines)
def test_database_proceed_filled_query_string_with_table_not_exist(self):
query = Query()
database = Database('database_name', query)
database.add_table(Table('drivers', []))
database.proceed_query('SELECT company, country FROM drivers1;')
self.assertEqual(database.get_error(), 'Table not exist')
def add_table(self, table: Table) -> None:
self.__tables[table.get_name()] = table