gistfile1.txt

    def setup
        self.banner
        url     = ARGV.shift
        url     = self.validate_instance(url)
        @driver ||= Selenium::WebDriver.for(:remote, :url => url)
    end

    def teardown
        @driver.quit
    end


Error:
InstanceTest#test_login:
NoMethodError: undefined method `quit' for nil:NilClass
    ruby_instance.rb:36:in `teardown'