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Cucumber: Read from File

November 1, 2012 1 comment

As your automated testing mature, you don’t want to limit users hard coding their application under test or browser driver all in the ENVironment file(env.rb). You can customized your environment by creating a configuration file where you can define variables like applications URL, timeout, database configurations and the like.

From the basic folder structure discussed in Automated Testing with Cucumber + Capybara post, add two more files:

config > environments.yml
support > custom_config.rb
where:

environments.yml – contains all the environment variables that you can use


google:
 app_host: http://www.google.com

bing:
 app_host: http://www.bing.com

custom_config.rb – ruby code where you configure your code to read from a specific file


require "erb"

module CustomConfig
 unless defined? @@env_config
 puts "loading environments.yml..."
 env = (ENV['ENVIRONMENT'] && ENV['ENVIRONMENT'].to_sym) || :google
 environments = YAML.load(ERB.new(File.read(File.expand_path('../../../config/environments.yml', __FILE__))).result)
 @@env_config = environments[env.to_s]
 raise "No config found for environment: #{env}" unless @@env_config
 end

def env_config
 @@env_config
 end

end

World(CustomConfig)

Your base folder should look like these by now:

Revised Base Folder

Then edit your env.rb by adding the following lines to your environment file.

require File.expand_path(‘../custom_config’, __FILE__)
include CustomConfig

Also update Capybara.app_host definition to look up to @@env_config. Your env.rb file should be edited to something like this:

env.rb


require 'capybara'
require 'capybara/cucumber'
require File.expand_path('../custom_config', __FILE__)
include CustomConfig

Capybara.default_driver = :selenium
Capybara.app_host = env_config['app_host']
Capybara.default_wait_time = 20

World(Capybara)

Notice in line #07 of your env.rb you are basically pointing app host to whatever environment you set in your custom_config.rbenv variable, (see line #06) for this example :google

From here on you should still be able to run your simple_search.feature file without error, the only difference is your code reads now from a specific file – environments.yml, through custom_config.rb.

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