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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62656 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
21 lines
693 B
Ruby
21 lines
693 B
Ruby
require_relative '../../../spec_helper'
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ruby_version_is ''...'2.5' do
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require 'mathn'
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describe "Integer#prime_division" do
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it "performs a prime factorization of a positive integer" do
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100.prime_division.should == [[2, 2], [5, 2]]
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end
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# Proper handling of negative integers has been added to MRI trunk
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# in revision 24091. Prior to that, all versions of MRI returned nonsense.
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it "performs a prime factorization of a negative integer" do
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-26.prime_division.should == [[-1, 1], [2, 1], [13, 1]]
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end
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it "raises a ZeroDivisionError when is called on zero" do
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lambda { 0.prime_division }.should raise_error(ZeroDivisionError)
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end
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end
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end
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