def test_arrangement(self):
actual = arithmetic_arranger(
["3 + 855", "3801 - 2", "45 + 43", "123 + 49"])
expected = (
" 3 3801 45 123\n+ 855 - 2 + 43 + "
"49\n----- ------ ---- -----")
self.assertEqual(
actual,
expected,
"Expected different output when calling "
'"arithmetic_arranger()" with ["3 + 855", "3801 - 2", '
'"45 + 43", "123 + 49"]',
)
actual = arithmetic_arranger(
["11 + 4", "3801 - 2999", "1 + 2", "123 + 49", "1 - 9380"])
expected = (
" 11 3801 1 123 1\n+ 4 - 2999 + 2 "
" + 49 - 9380\n---- ------ --- ----- ------")
self.assertEqual(
actual,
expected,
"Expected different output when calling "
'"arithmetic_arranger()" with ["11 + 4", "3801 - 2999", '
'"1 + 2", "123 + 49", "1 - 9380"]',
)
def test_only_digits(self):
actual = arithmetic_arranger(
["98 + 3g5", "3801 - 2", "45 + 43", "123 + 49"])
expected = "Error: Numbers must only contain digits."
self.assertEqual(
actual,
expected,
'Expected calling "arithmetic_arranger()" with a problem '
"that contains a letter character in the number to return "
'"Error: Numbers must only contain digits."',
)
def test_too_many_digits(self):
actual = arithmetic_arranger(
["24 + 85215", "3801 - 2", "45 + 43", "123 + 49"])
expected = "Error: Numbers cannot be more than four digits."
self.assertEqual(
actual,
expected,
'Expected calling "arithmetic_arranger()" with a problem '
'that has a number over 4 digits long to return "Error: '
'Numbers cannot be more than four digits."',
)
def test_incorrect_operator(self):
actual = arithmetic_arranger(
["3 / 855", "3801 - 2", "45 + 43", "123 + 49"])
expected = "Error: Operator must be '+' or '-'."
self.assertEqual(
actual,
expected,
'''Expected calling "arithmetic_arranger()" with a problem
that uses the "/" operator to return "Error: Operator must
be '+' or '-'."''',
)
def test_too_many_problems(self):
actual = arithmetic_arranger([
"44 + 815", "909 - 2", "45 + 43", "123 + 49", "888 + 40",
"653 + 87"
])
expected = "Error: Too many problems."
self.assertEqual(
actual,
expected,
'Expected calling "arithmetic_arranger()" with more than '
'five problems to return "Error: Too many problems."',
)
def test_solutions(self):
actual = arithmetic_arranger(
["32 - 698", "1 - 3801", "45 + 43", "123 + 49"], True)
expected = (
" 32 1 45 123\n- 698 - 3801 + 43 + "
"49\n----- ------ ---- -----\n -666 -3800 88 "
" 172")
self.assertEqual(
actual,
expected,
"Expected solutions to be correctly displayed in output when "
'calling "arithmetic_arranger()" with arithmetic problems and'
" a second argument of `True`.",
)