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Diffstat (limited to 'spec/ruby/library/prime/prime_spec.rb')
| -rw-r--r-- | spec/ruby/library/prime/prime_spec.rb | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/spec/ruby/library/prime/prime_spec.rb b/spec/ruby/library/prime/prime_spec.rb new file mode 100644 index 0000000000..7a41496f7f --- /dev/null +++ b/spec/ruby/library/prime/prime_spec.rb @@ -0,0 +1,17 @@ +require File.expand_path('../../../spec_helper', __FILE__) +require 'prime' + +describe "Prime#prime?" do + it "returns a true value for prime numbers" do + Prime.prime?(2).should be_true + Prime.prime?(3).should be_true + Prime.prime?(2**31-1).should be_true # 8th Mersenne prime (M8) + end + + it "returns a false value for composite numbers" do + Prime.prime?(4).should be_false + Prime.prime?(15).should be_false + Prime.prime?(2**32-1).should be_false + Prime.prime?( (2**17-1)*(2**19-1) ).should be_false # M6*M7 + end +end |