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* For easier modifications of ruby/spec by MRI developers. * .gitignore: track changes under spec. * spec/mspec, spec/rubyspec: add in-tree mspec and ruby/spec. These files can therefore be updated like any other file in MRI. Instructions are provided in spec/README. [Feature #13156] [ruby-core:79246] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58595 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
17 lines
503 B
Ruby
17 lines
503 B
Ruby
require File.expand_path('../../../../spec_helper', __FILE__)
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require 'prime'
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describe "Integer#prime?" do
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it "returns a true value for prime numbers" do
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2.prime?.should be_true
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3.prime?.should be_true
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(2**31-1).prime?.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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4.prime?.should be_false
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15.prime?.should be_false
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(2**32-1).prime?.should be_false
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( (2**17-1)*(2**19-1) ).prime?.should be_false # M6*M7
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end
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end
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