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fraction_test.rb
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fraction_test.rb
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# frozen_string_literal: true
require 'minitest/autorun'
require './fraction'
# Helper function for testing rationals
def assert_rational(fraction, num, dnom)
assert fraction.numerator == num
assert fraction.denominator == dnom
end
class Test_Fraction < Minitest::Test
def test_enforce_whole_numbers
skip 'WHOLE_NUMBERS is true' unless Fraction::WHOLE_NUMBERS == true
assert_raises ArgumentError do
Fraction.improper_fraction(-1, 2, 3)
end
end
# fraction tests
def test_improper_fraction
r = Fraction.improper_fraction(1, 2, 3)
assert_rational(r, 5, 3)
end
# parser tests
def test_parse_int
r = Fraction.parse('1')
assert_rational(r, 1, 1)
end
def test_parse_fraction
r = Fraction.parse('1/2')
assert_rational(r, 1, 2)
end
def test_parse_mixed
r = Fraction.parse('1_2/3')
assert_rational(r, 5, 3)
end
# string tests
def test_int_to_string
r = Fraction.improper_fraction(1, 0, 0)
assert Fraction.to_string(r) == '1'
end
def test_fraction_to_string
r = Fraction.improper_fraction(0, 2, 3)
assert Fraction.to_string(r) == '2/3'
end
def test_mixed_number_to_string
r = Fraction.improper_fraction(1, 2, 3)
assert Fraction.to_string(r) == '1_2/3'
end
def test_example_run
r = Fraction.parse('1/2') * Fraction.parse('3_3/4')
assert Fraction.to_string(r) == '1_7/8'
r = Fraction.parse('2_3/8') + Fraction.parse('9/8')
assert Fraction.to_string(r) == '3_1/2'
end
end