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require File.expand_path('../../../../spec_helper', __FILE__)
require 'prime'
describe "Integer#prime?" do
it "returns a true value for prime numbers" do
2.prime?.should be_true
3.prime?.should be_true
(2**31-1).prime?.should be_true # 8th Mersenne prime (M8)
end
it "returns a false value for composite numbers" do
4.prime?.should be_false
15.prime?.should be_false
(2**32-1).prime?.should be_false
( (2**17-1)*(2**19-1) ).prime?.should be_false # M6*M7
end
end
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