def can_correctly_convert_numbers_31_to_40():
assert convert(31) == 'XXXI'
assert convert(32) == 'XXXII'
assert convert(33) == 'XXXIII'
assert convert(34) == 'XXXIV'
assert convert(35) == 'XXXV'
assert convert(36) == 'XXXVI'
assert convert(37) == 'XXXVII'
assert convert(38) == 'XXXVIII'
assert convert(39) == 'XXXIX'
assert convert(40) == 'XL'
def can_correctly_convert_numbers_11_to_20():
assert convert(11) == 'XI'
assert convert(12) == 'XII'
assert convert(13) == 'XIII'
assert convert(14) == 'XIV'
assert convert(15) == 'XV'
assert convert(16) == 'XVI'
assert convert(17) == 'XVII'
assert convert(18) == 'XVIII'
assert convert(19) == 'XIX'
assert convert(20) == 'XX'
def can_correctly_convert_numbers_21_to_30():
assert convert(21) == 'XXI'
assert convert(22) == 'XXII'
assert convert(23) == 'XXIII'
assert convert(24) == 'XXIV'
assert convert(25) == 'XXV'
assert convert(26) == 'XXVI'
assert convert(27) == 'XXVII'
assert convert(28) == 'XXVIII'
assert convert(29) == 'XXIX'
assert convert(30) == 'XXX'
def can_correctly_convert_numbers_1_to_10():
assert convert(1) == 'I'
assert convert(2) == 'II'
assert convert(3) == 'III'
assert convert(4) == 'IV'
assert convert(5) == 'V'
assert convert(6) == 'VI'
assert convert(7) == 'VII'
assert convert(8) == 'VIII'
assert convert(9) == 'IX'
assert convert(10) == 'X'
def returns_I_II_or_III_if_remainder_of_division_by_5_is_1_to_3():
"""
Test that our program ends in I, II, or III if the remainder
when dividing by 5 is 1, 2, or 3, respectively.
"""
assert convert(1)[-1:] == "I"
assert convert(2)[-2:] == "II"
assert convert(3)[-3:] == "III"
assert convert(6)[-1:] == "I"
assert convert(7)[-2:] == "II"
assert convert(8)[-3:] == "III"
assert convert(11)[-1:] == "I"
assert convert(12)[-2:] == "II"
assert convert(13)[-3:] == "III"
def return_V_or_X_if_num_mod_5_is_0():
assert convert( 5)[-1] == "V"
assert convert(10)[-1] == "X"
assert convert(15)[-1] == "V"
assert convert(20)[-1] == "X"
assert convert(25)[-1] == "V"
assert convert(30)[-1] == "X"
def returns_IX_if_num_mod_5_is_4_and_num_plus_1_divisible_by_10():
assert convert(4)[-2:] != "IX"
assert convert(9)[-2:] == "IX"
assert convert(14)[-2:] != "IX"
assert convert(19)[-2:] == "IX"
assert convert(124)[-2:] != "IX"
assert convert(129)[-2:] == "IX"
def can_convert_2_to_II():
assert convert(2) == "II"
def can_convert_1_to_I():
assert convert(1) == "I"
def can_correctly_convert_all_the_numbers():
assert convert(50) == 'L'
assert convert(90) == 'XC'
assert convert(100) == 'C'
assert convert(110) == 'CX'
assert convert(140) == 'CXL'
assert convert(150) == 'CL'
assert convert(190) == 'CXC'
assert convert(400) == 'CD'
assert convert(500) == 'D'
assert convert(900) == 'CM'
assert convert(1000) == 'M'
assert convert(2949) == 'MMCMXLIX'
assert convert(4321) == 'MMMMCCCXXI'
