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require File.expand_path('../../../../spec_helper', __FILE__)
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.
ruby_bug "trunk@24091", "1.9.1" do
it "Performs a prime factorization of a negative integer" do
-26.prime_division.should == [[-1, 1], [2, 1], [13, 1]]
end
end
it "raises a ZeroDivisionError when is called on zero" do
lambda { 0.prime_division }.should raise_error(ZeroDivisionError)
end
end
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