def test_get_first_value_returns_ordered_first():
prices_list = [8, 3, 5, 7, 6]
mock_sort_function = Mock(return_value=[3, 5, 6, 7, 8])
assert get_first_value(mock_sort_function, prices_list) == 3
assert mock_sort_function.call_count == 1
# verificamos que se llama a la funcion de orden con la lista incial
mock_sort_function.assert_called_with(prices_list)
def test_get_first_value_returns_min():
prices_list = [8, 3, 5, 7, 6]
assert 3 == get_first_value(sorted, prices_list)
def test_get_first_value_fails():
prices_list = ['100', '90', '400']
assert get_first_value(sorted, prices_list) == '90'
def test_get_first_value_returns_min_on_string_numbers():
def sort_string_numbers(string_numbers):
return sorted(string_numbers, key=lambda x: int(x))
prices_list = ['100', '90', '400']
assert get_first_value(sort_string_numbers, prices_list) == '90'
def test_get_first_value_except_on_empty_list():
prices_list = []
with pytest.raises(IndexError):
get_first_value(sorted, prices_list)