diff options
Diffstat (limited to 'spec/ruby/core/integer/gcd_spec.rb')
-rw-r--r-- | spec/ruby/core/integer/gcd_spec.rb | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/spec/ruby/core/integer/gcd_spec.rb b/spec/ruby/core/integer/gcd_spec.rb index 69f711d4c5..238bf66cc0 100644 --- a/spec/ruby/core/integer/gcd_spec.rb +++ b/spec/ruby/core/integer/gcd_spec.rb @@ -43,6 +43,17 @@ describe "Integer#gcd" do 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 lambda { 12.gcd }.should raise_error(ArgumentError) end |