Add specs for new library
user
```ruby
require_relative '../spec_helper'
require_relative '../../libraries/random_password'

describe OpenSSLCookbook::RandomPassword do
  let(:instance) do
    Class.new { include OpenSSLCookbook::RandomPassword }.new
  end

  describe ".included" do
    it "requires securerandom" do
      instance
      expect(defined?(SecureRandom)).to_not be(false)
    end
  end

  describe "#random_password" do
    context "with no options" do
      it "returns a random hex password" do
        expect(instance.random_password).to match(/[a-z0-9]{20}/)
      end
    end

    context "with the :length option" do
      it "returns a password with the given length" do
        expect(instance.random_password(length: 50).size).to eq(50)
      end
    end

    context "with the :mode option" do
      it "returns a :hex password with :hex" do
        expect(instance.random_password(mode: :hex)).to match(/[a-z0-9]{20}/)
      end

      it "returns a :base64 password with :base64" do
        expect(instance.random_password(mode: :base64).size).to eq(20)
      end

      it "returns a :random_bytes password with :random_bytes" do
        # There's nothing to really assert here, since the length can vary
        # depending on the encoding and whatnot...
        expect { instance.random_password(mode: :random_bytes) }.to_not raise_error
      end
    end

    context "with the :encoding option" do
      it "returns a password with the forced encoding" do
        expect(instance.random_password(encoding: "ASCII").encoding.to_s).to eq("US-ASCII")
      end
    end
  end
end
```
assistant