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20 lines
582 B
Ruby
20 lines
582 B
Ruby
require_relative '../../spec_helper'
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ruby_version_is ""..."3.1" do
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require 'prime'
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describe "Prime#prime?" do
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it "returns a true value for prime numbers" do
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Prime.prime?(2).should be_true
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Prime.prime?(3).should be_true
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Prime.prime?(2**31-1).should be_true # 8th Mersenne prime (M8)
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end
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it "returns a false value for composite numbers" do
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Prime.prime?(4).should be_false
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Prime.prime?(15).should be_false
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Prime.prime?(2**32-1).should be_false
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Prime.prime?( (2**17-1)*(2**19-1) ).should be_false # M6*M7
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end
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end
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end
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