How to use license key during unit testing

I am trying to use PDF Tron in ruby service and initializing PDFTron using ENV variable.

require 'PDFNetC/Lib/PDFNetRuby'
include PDFNetRuby

module Converters
  class PDFToXODConverter
    def self.convert(in_file_path)
        out_file_path = "#{ENV['TEMP_DIR']}/#{Time.now.to_i}.xod"
        PDFNet.Initialize(ENV['PDFTRON_LICENSE_KEY'])
        Convert.ToXod(in_file_path, out_file_path)
        File.open(out_file_path, 'rb')
    end
  end
end

I don't want to set the key in test environment. Bit Initialize throws a Bad licence key exception when running the test without the key or key set to an empty string.

How to use PDFNet.Initialize in unit tests?

How about the following?

`
require ‘PDFNetC/Lib/PDFNetRuby’
include PDFNetRuby

module Converters
class PDFToXODConverter
def self.convert(in_file_path)
out_file_path = “#{ENV[‘TEMP_DIR’]}/#{Time.now.to_i}.xod”
lic_key = ENV[‘PDFTRON_LICENSE_KEY’]
if lic_key.nil?
PDFNet.Initialize()
else
PDFNet.Initialize(lic_key)
end
Convert.ToXod(in_file_path, out_file_path)
File.open(out_file_path, ‘rb’)
end
end
end
`