def test_table_column_names():
tbl_str = '''
x INT,
y DOUBLE PRECISION,
z TEXT '''
names = list(field_names(tbl_str, mode_filter=None))
assert names == ['x', 'y', 'z']
def test_empty_arg_list():
# happens for e.g. parameter-less functions like now()
names = field_names('')
assert list(names) == []
def test_argument_names():
func_header = 'IN x INT DEFAULT 2, OUT y DOUBLE PRECISION'
names = field_names(func_header, mode_filter=['OUT', 'INOUT'])
assert list(names) == ['y']
