def validate_text(self):
is_first_fraction = Fraction.is_fraction(self.first_fraction)
is_second_fraction = Fraction.is_fraction(self.second_fraction)
if is_first_fraction and is_second_fraction:
self.set_btn_enabled()
else:
self.set_btn_disabled()
def click_convert(self):
first_fraction = Fraction.from_string(self.first_fraction)
second_fraction = Fraction.from_string(self.second_fraction)
if self.operation == '+':
self.message_text = str(first_fraction + second_fraction)
elif self.operation == '-':
self.message_text = str(first_fraction - second_fraction)
elif self.operation == '*':
self.message_text = str(first_fraction * second_fraction)
elif self.operation == '/':
try:
result = str(first_fraction / second_fraction)
except InvalidFractionError:
result = 'Error! Cannot divide by zero!'
self.message_text = str(result)
else:
self.message_text = str(list(first_fraction.to_continuous()))
def test_is_fraction_1_2(self):
result = Fraction.is_fraction('1/2')
self.assertTrue(result)
def test_can_create_fraction(self):
frac = Fraction()
self.assertTrue(isinstance(frac, Fraction))
def test_is_equal_can_return_false_denominator_differs(self):
frac = Fraction(1, 2)
self.assertFalse(frac.is_equal(2, 2))
def test_can_print_fraction(self):
frac = Fraction(5, 7)
self.assertEqual(str(frac), '5/7')
def test_cannot_create_x_0_fraction(self):
with self.assertRaises(InvalidFractionError):
Fraction(2, 0)
def test_can_create_minus_1_2_fraction_from_str(self):
frac = Fraction.from_string('-1/2')
self.assertTrue(frac.is_equal(-1, 2))
def test_can_create_1_2_fraction(self):
frac = Fraction(1, 2)
self.assertTrue(frac.is_equal(1, 2))
def test_can_convert_to_continuous_9_4(self):
frac = Fraction(9, 4)
expected_coefficients = [2, 4]
for actual, expected in zip(frac.to_continuous(),
expected_coefficients):
self.assertEqual(actual, expected)
def test_can_convert_to_continuous_1071_462(self):
frac = Fraction(1071, 462)
expected_coefficients = [2, 3, 7]
for actual, expected in zip(frac.to_continuous(),
expected_coefficients):
self.assertEqual(actual, expected)
def test_can_convert_from_decimal_0_333333333333(self):
frac = Fraction.from_decimal(0.333333333333)
self.assertTrue(frac.is_equal(333333333333, 1000000000000))
def test_can_convert_from_decimal_minus_2_4(self):
frac = Fraction.from_decimal(-2.4)
self.assertTrue(frac.is_equal(-12, 5))
def test_can_convert_from_decimal_int_1(self):
frac = Fraction.from_decimal(1)
self.assertTrue(frac.is_equal(1, 1))
def test_is_fraction_1(self):
result = Fraction.is_fraction('1')
self.assertTrue(result)
def test_can_convert_to_decimal_1_2(self):
frac = Fraction(1, 2)
self.assertEqual(frac.to_decimal(), 0.5)
def test_multiply_one_negative_fraction(self):
frac_1 = Fraction(1, 3)
frac_2 = Fraction(-2, 5)
result = frac_1 * frac_2
self.assertTrue(result.is_equal(-2, 15))
def test_can_convert_from_decimal_0_75(self):
frac = Fraction.from_decimal(0.75)
self.assertTrue(frac.is_equal(3, 4))
def test_multiply_one_negative_fraction_minus_in_denominator(self):
frac_1 = Fraction(1, 3)
frac_2 = Fraction(2, -5)
result = frac_1 * frac_2
self.assertTrue(result.is_equal(-2, 15))
def test_can_create_1_fraction_from_str(self):
frac = Fraction.from_string('1')
self.assertTrue(frac.is_equal(1, 1))
def test_multiply_two_negative_fractions(self):
frac_1 = Fraction(-1, 3)
frac_2 = Fraction(2, -5)
result = frac_1 * frac_2
self.assertTrue(result.is_equal(2, 15))
def test_auto_reduce_fraction(self):
frac = Fraction(2, 4)
self.assertTrue(frac.is_equal(1, 2))
def test_multiply_fraction_and_int_number(self):
fraction = Fraction(-1, 6)
number = 2
result = number * fraction
self.assertTrue(result.is_equal(-1, 3))
def test_can_get_int_part(self):
frac = Fraction(7, 3)
self.assertEqual(frac.get_integer_part(), 2)
def test_multiply_fraction_and_decimal_number(self):
fraction = Fraction(1, 6)
number = 2.5
result = number * fraction
self.assertTrue(result.is_equal(5, 12))
def test_can_get_nominator_denominator_minus_1_2(self):
p, q = Fraction.get_nominator_denominator('-1/2')
result = p == '-1' and q == '2'
self.assertTrue(result)
def test_multiply_fractions_by_zero(self):
frac_1 = Fraction(1, 2)
frac_2 = Fraction(0, 2)
result = frac_1 * frac_2
self.assertTrue(result.is_equal(0, 1))
def test_none_when_get_nominator_denominator_invalid(self):
result = Fraction.get_nominator_denominator('a')
self.assertIsNone(result)
def test_cannot_divide_fractions_by_zero(self):
frac_1 = Fraction(1, 2)
frac_2 = Fraction(0, 2)
with self.assertRaises(InvalidFractionError):
frac_1 / frac_2
def test_is_fraction_minus_1_2(self):
result = Fraction.is_fraction('-1/2')
self.assertTrue(result)
def test_divide_two_fractions(self):
frac_1 = Fraction(2, 3)
frac_2 = Fraction(2, 3)
result = frac_1 / frac_2
self.assertTrue(result.is_equal(1, 1))
def test_is_not_fraction_empty(self):
result = Fraction.is_fraction('')
self.assertFalse(result)
def test_substract_fraction_1_2_1_2(self):
frac_1 = Fraction(1, 2)
frac_2 = Fraction(1, 2)
result = frac_1 - frac_2
self.assertTrue(result.is_equal(0, 1))
def test_can_convert_from_decimal_minus_0_5(self):
frac = Fraction.from_decimal(-0.5)
self.assertTrue(frac.is_equal(-1, 2))
def test_sum_negative_fraction_minus_1_2_minus_1_2(self):
frac_1 = Fraction(1, -2)
frac_2 = Fraction(-1, 2)
result = frac_1 + frac_2
self.assertTrue(result.is_equal(-1, 1))
def test_sum_fraction_1_2_1_3(self):
frac_1 = Fraction(1, 2)
frac_2 = Fraction(1, 3)
result = frac_1 + frac_2
self.assertTrue(result.is_equal(5, 6))
def test_default_fraction_is_0_1(self):
frac = Fraction()
self.assertTrue(frac.is_equal(0, 1))
