romanic_testing/romanic_test.rb at master · minghanm/romanic_testing · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
# get the module we are testing
require "./romanic"
# use minitest (my fav test library)
require "minitest/autorun"

# Mix the Romanic methods into their respective classes
Integer.send :include, Romanic::RomanicIntegers
String.send :include, Romanic::RomanicStrings

# Now time to test...
class TestRoman < Minitest::Test

  def test_conversion_to_roman_numerals_works
    assert_equal('I', 1.to_roman)
    assert_equal('II', 2.to_roman)
    assert_equal('IV', 4.to_roman)
    assert_equal('XIV', 14.to_roman)
    assert_equal('XLIX', 49.to_roman)
    assert_equal('C', 100.to_roman)
    assert_equal('MCMXCIX', 1999.to_roman)
    assert_equal('MMMMCMXCIX', 4999.to_roman)
  end

  def test_out_of_bounds_conversions_to_roman_fail
    assert_nil 10001.to_roman
    assert_nil 5000.to_roman
    assert_nil 0.to_roman
    assert_nil -3.to_roman
  end

  def test_string_conversions_from_roman_works
    assert_equal(1, 'I'.from_roman)
    assert_equal(2, 'II'.from_roman)
    assert_equal(4, 'IV'.from_roman)
    assert_equal(14, 'XIV'.from_roman)
    assert_equal(49, 'XLIX'.from_roman)
    assert_equal(100, 'C'.from_roman)
    assert_equal(1999, 'MCMXCIX'.from_roman)
    assert_equal(4999, 'MMMMCMXCIX'.from_roman)
  end

  def test_non_roman_strings_fail
    assert_nil 'ii'.from_roman
    assert_nil 'LKD'.from_roman
    assert_nil '2010'.from_roman
    assert_nil 'XX!'.from_roman
    assert_nil 'IIII'.from_roman
    assert_nil 'IIIII'.from_roman
    assert_nil 'XIIII'.from_roman
  end

end