mirror of
https://github.com/ruby/ruby.git
synced 2022-11-09 12:17:21 -05:00
21 lines
689 B
Ruby
21 lines
689 B
Ruby
require_relative '../../../spec_helper'
|
|
|
|
ruby_version_is ''...'2.5' do
|
|
require 'mathn'
|
|
|
|
describe "Integer#prime_division" do
|
|
it "performs a prime factorization of a positive integer" do
|
|
100.prime_division.should == [[2, 2], [5, 2]]
|
|
end
|
|
|
|
# Proper handling of negative integers has been added to MRI trunk
|
|
# in revision 24091. Prior to that, all versions of MRI returned nonsense.
|
|
it "performs a prime factorization of a negative integer" do
|
|
-26.prime_division.should == [[-1, 1], [2, 1], [13, 1]]
|
|
end
|
|
|
|
it "raises a ZeroDivisionError when is called on zero" do
|
|
-> { 0.prime_division }.should raise_error(ZeroDivisionError)
|
|
end
|
|
end
|
|
end
|