ruby_version_is "1.8.7" do
  require 'securerandom'

  describe "SecureRandom.random_number" do
    it "generates a random positive number smaller then the positive integer argument" do
      (1..64).each do |idx|
        num = SecureRandom.random_number(idx)
        num.should be_kind_of(Fixnum)
        (0 <= num).should == true
        (num < idx).should == true
      end
    end

    it "generates a random float number between 0.0 and 1.0 if no argument provided" do
      64.times do
        num = SecureRandom.random_number
        num.should be_kind_of(Float)
        (0.0 <= num).should == true
        (num < 1.0).should == true
      end
    end

    it "generates a random float number between 0.0 and 1.0 if argument is negative" do
      num = SecureRandom.random_number(-10)
      num.should be_kind_of(Float)
      (0.0 <= num).should == true
      (num < 1.0).should == true
    end

    it "generates different float numbers with subsequent invocations" do
      # quick and dirty check, but good enough
      values = []
      256.times do
        val = SecureRandom.random_number
        # make sure the random values are not repeating
        values.include?(val).should == false
        values << val
      end
    end

    it "raises ArgumentError if the argument is non-numeric" do
      lambda {
        SecureRandom.random_number(Object.new)
      }.should raise_error(ArgumentError)
    end
  end
end