ruby--ruby/spec/ruby/library/securerandom/base64_spec.rb

require_relative '../../spec_helper'

require 'securerandom'

describe "SecureRandom.base64" do
  it "generates a random base64 string out of specified number of random bytes" do
    (16..128).each do |idx|
      base64 = SecureRandom.base64(idx)
      base64.should be_kind_of(String)
      base64.length.should < 2 * idx
      base64.should =~ /^[A-Za-z0-9\+\/]+={0,2}$/
    end

    base64 = SecureRandom.base64(16.5)
    base64.should be_kind_of(String)
    base64.length.should < 2 * 16
  end

  it "returns an empty string when argument is 0" do
    SecureRandom.base64(0).should == ""
  end

  it "generates different base64 strings with subsequent invocations" do
    # quick and dirty check, but good enough
    values = []
    256.times do
      base64 = SecureRandom.base64
      # make sure the random values are not repeating
      values.include?(base64).should == false
      values << base64
    end
  end

  it "generates a random base64 string out of 32 random bytes" do
    SecureRandom.base64.should be_kind_of(String)
    SecureRandom.base64.length.should < 32 * 2
  end

  it "treats nil argument as default one and generates a random base64 string" do
    SecureRandom.base64(nil).should be_kind_of(String)
    SecureRandom.base64(nil).length.should < 32 * 2
  end

  it "raises ArgumentError on negative arguments" do
    -> {
      SecureRandom.base64(-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.base64(obj).size.should < 10
  end
end