require File.dirname(__FILE__) + '/../../spec_helper'

ruby_version_is "1.8.7" do
  require 'securerandom'

  describe "SecureRandom.random_bytes" do
    it "generates a random binary string of length 16 if no argument is provided" do
      bytes = SecureRandom.random_bytes
      bytes.should be_kind_of(String)
      bytes.length.should == 16
    end

    it "generates a random binary string of length 16 if argument is nil" do
      bytes = SecureRandom.random_bytes(nil)
      bytes.should be_kind_of(String)
      bytes.length.should == 16
    end

    it "generates a random binary string of specified length" do
      (1..64).each do |idx|
        bytes = SecureRandom.random_bytes(idx)
        bytes.should be_kind_of(String)
        bytes.length.should == idx
      end

      SecureRandom.random_bytes(2.2).length.should eql(2)
    end

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

    it "raises ArgumentError on negative arguments" do
      lambda {
        SecureRandom.random_bytes(-1)
      }.should raise_error(ArgumentError)
    end

    it "tries to convert the passed argument to an Integer using #to_int" do
      obj = mock("to_int")
      obj.should_receive(:to_int).and_return(5)
      SecureRandom.random_bytes(obj).size.should eql(5)
    end
  end
end
