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
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
require_relative '../../spec_helper'
describe "Integer#gcd" do
it "returns self if equal to the argument" do
1.gcd(1).should == 1
398.gcd(398).should == 398
end
it "returns an Integer" do
36.gcd(6).should be_kind_of(Integer)
4.gcd(20981).should be_kind_of(Integer)
end
it "returns the greatest common divisor of self and argument" do
10.gcd(5).should == 5
200.gcd(20).should == 20
end
it "returns a positive integer even if self is negative" do
-12.gcd(6).should == 6
-100.gcd(100).should == 100
end
it "returns a positive integer even if the argument is negative" do
12.gcd(-6).should == 6
100.gcd(-100).should == 100
end
it "returns a positive integer even if both self and argument are negative" do
-12.gcd(-6).should == 6
-100.gcd(-100).should == 100
end
it "accepts a Bignum argument" do
bignum = 9999**99
bignum.should be_kind_of(Integer)
99.gcd(bignum).should == 99
end
it "works if self is a Bignum" do
bignum = 9999**99
bignum.should be_kind_of(Integer)
bignum.gcd(99).should == 99
end
it "doesn't cause an integer overflow" do
[2 ** (1.size * 8 - 2), 0x8000000000000000].each do |max|
[max - 1, max, max + 1].each do |num|
num.gcd(num).should == num
(-num).gcd(num).should == num
(-num).gcd(-num).should == num
num.gcd(-num).should == num
end
end
end
it "raises an ArgumentError if not given an argument" do
-> { 12.gcd }.should raise_error(ArgumentError)
end
it "raises an ArgumentError if given more than one argument" do
-> { 12.gcd(30, 20) }.should raise_error(ArgumentError)
end
it "raises a TypeError unless the argument is an Integer" do
-> { 39.gcd(3.8) }.should raise_error(TypeError)
-> { 45872.gcd([]) }.should raise_error(TypeError)
end
end
|
