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require File.expand_path('../../../spec_helper', __FILE__)
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(Bignum)
99.gcd(bignum).should == 99
end
it "works if self is a Bignum" do
bignum = 9999**99
bignum.should be_kind_of(Bignum)
bignum.gcd(99).should == 99
end
it "raises an ArgumentError if not given an argument" do
lambda { 12.gcd }.should raise_error(ArgumentError)
end
it "raises an ArgumentError if given more than one argument" do
lambda { 12.gcd(30, 20) }.should raise_error(ArgumentError)
end
it "raises a TypeError unless the argument is an Integer" do
lambda { 39.gcd(3.8) }.should raise_error(TypeError)
lambda { 45872.gcd([]) }.should raise_error(TypeError)
end
end
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