diff options
Diffstat (limited to 'spec/ruby/library/prime/integer/prime_spec.rb')
| -rw-r--r-- | spec/ruby/library/prime/integer/prime_spec.rb | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/spec/ruby/library/prime/integer/prime_spec.rb b/spec/ruby/library/prime/integer/prime_spec.rb new file mode 100644 index 0000000000..d24f883b19 --- /dev/null +++ b/spec/ruby/library/prime/integer/prime_spec.rb @@ -0,0 +1,17 @@ +require_relative '../../../spec_helper' +require 'prime' + +describe "Integer#prime?" do + it "returns a true value for prime numbers" do + 2.prime?.should == true + 3.prime?.should == true + (2**31-1).prime?.should == true # 8th Mersenne prime (M8) + end + + it "returns a false value for composite numbers" do + 4.prime?.should == false + 15.prime?.should == false + (2**32-1).prime?.should == false + ( (2**17-1)*(2**19-1) ).prime?.should == false # M6*M7 + end +end |