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20 lines
592 B
Ruby
20 lines
592 B
Ruby
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require File.expand_path('../../../../spec_helper', __FILE__)
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require 'prime'
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describe "Integer#prime_division" do
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it "returns an array of a prime factor and a corresponding exponent" do
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(2*3*5*7*11*13*17).prime_division.should ==
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[[2,1], [3,1], [5,1], [7,1], [11,1], [13,1], [17,1]]
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end
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it "returns an empty array for 1" do
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1.prime_division.should == []
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end
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it "returns an empty array for -1" do
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-1.prime_division.should == [[-1, 1]]
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end
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it "raises ZeroDivisionError for 0" 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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