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CHAPTER 11 ACCEPTANCE TESTING
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Figure 11-11. Running the recorded acceptance tests Next, click the Walk radio button in the Execute Tests section of TestRunner window, and then click the All button beneath it to run the tests again. Selenium now runs the tests in a slowmotion mode that allows you to see each command being executed. You can also try stepping through the tests, by clicking the Step radio button in the Execute Tests section and clicking the All button. Instead of executing the whole test, Selenium stops after each executed command. To continue the test, click the Continue button. This is useful when you re debugging a test.
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Summary
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In this chapter, you learned how to write automated acceptance tests using Selenium and the Selenium on Rails plugin. By automating acceptance tests, you not only remove manual work, but you also raise your confidence that your application works according to the requirements. We also showed you how to simplify the process of writing acceptance tests by using the Selenium IDE Firefox extension to record the tests. In the next chapter, we ll show you how to deploy your application to production. There shouldn t be any surprises, as we have implemented a full set of automated tests that exercise almost all parts of the application.
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Application Deployment
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n this chapter, we ll show you how to set up an application s production environment, including the LightTPD web server and FastCGI extension. Then we will walk through the manual deployment process. Finally, we ll demonstrate how to simplify deployment tasks with Capistrano, a tool specifically designed to automate the deployment of Ruby on Rails applications.
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Setting Up the Production Environment
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George has bought a new Intel-powered server running Ubuntu Linux, to which we will deploy LightTPD (web server), Ruby on Rails and FastCGI (application server), and MySQL (database server). The high-level system architecture of the Emporium production environment is shown in Figure 12-1. Although we talk about three different servers, the production environment consists of only one physical machine, since that is all we need to start. Later, we can support more traffic if the need arises by scaling horizontally (adding more machines) or vertically (adding more processing power).
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CHAPTER 12 APPLICATION DEPLOYMENT
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Figure 12-1. The Emporium production environment
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Connecting to the Production Server: SSH
We will be using Secure Shell (SSH) throughout this chapter to connect to the production machine. If you haven t installed the SSH server on your production machine yet, you need to do it now before proceeding. Log in to the production server and execute the following command: $ sudo apt-get install openssh-server After the installation is complete, you can start the SSH server with this command: $ sudo /etc/init.d/ssh start
* Starting OpenBSD Secure Shell server
CHAPTER 12 APPLICATION DEPLOYMENT
With the SSH server running on the production machine, connect to the production server by executing the following: $ ssh username@production_server_ip
Note Originally developed by Tatu Yl nen, SSH is a set of standards and protocols that allow you to
establish a secure connection to a remote server. We assume that you have a basic understanding of what SSH is and how it can be used. For more information about SSH, see Wikipedia s entry on SSH (http://en.wikipedia.org/wiki/Secure_Shell).
You are now ready to start installing the software on your production environment.
Installing the Web Server: LightTPD
The web server handles the communication between the user s browser and the Emporium application, which is running on the application server in one or more separate processes. When a request comes in from the Internet, the web server forwards the request (by acting as a reverse proxy and a load balancer) to one of the application servers. In this book, we use LightTPD as the web server, because it is a tried-and-tested open source web server that, according to its homepage (http://www.lighttpd.net) is optimized for high performance. This claim is backed up by benchmarks, which put it among the fastest web servers available currently, and in front of the more popular Apache in some areas. LightTPD is easy to configure and includes the mod_fastcgi module, which can communicate with external FastCGI processes running Ruby on Rails applications. After being forwarded by LightTPD, the request is processed by Ruby on Rails, and the output is sent back to the client, again using the FastCGI protocol.
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