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Before you can build a gem, it s necessary to collect all the files you want to make up the gem. This is usually done using a standard structure. So far you have your string_extend.rb file, and this is the only file you want within your gem. First, it s necessary to create a folder to contain all the gem s folders, so you create a folder called string_extend. Under this folder you create several other folders as follows: lib: This directory will contain the Ruby code related to the library. pkg: This is a temporary directory where the gem will be generated. test: This directory will contain any unit tests or other testing scripts related to the library. doc: This is an optional directory that could contain documentation about the library, particularly documentation created with or by rdoc. bin: This is another optional directory that can contain system tools and command line scripts that are related to the library. For example, RubyGems itself installs the gem command line tool; such a tool would be placed into bin. At a minimum, you should end up with string_extend/lib, string_extend/pkg, and

Great. Integer is a subclass of Number, so we can put a Integer or a Double into the Holder[Number]. We preserve the ability to use class hierarchies with invariant type parameters. Let s finally see what happens when we try to pass a Holder[Double] into round.

The URL must point to the same domain where the Selenium script has been deployed. For example, you can t test www.google.com. This is due to the so-called same origin policy enforced by browsers. This limitation can be circumvented by using a proxy. Use clickAndWait(locator) if the action causes a new page to load (as most do).

In this example, you should place string_extend.rb within the string_extend/lib directory. If you have tests, documentation, or command line scripts, place them into the respective directories.

scala> val dh = new Holder(33.3d)

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Note The preceding directory names are written in a Unix style, but on Windows would be represented

similarly to this: c:\gems\string_extend, c:\gems\string_extend\lib, and so on. Take this into account throughout this entire section.

Assertions, or checks, verify that the state of the application is as expected after one or more actions have been executed by Selenium. For example, you can test that the title of the page or the value of a variable is correct. Assertions are split into three groups that behave somewhat differently: Assertions (assert) abort the test if they fail. Verifications (verify) log the error and allow the test to continue. Wait for (waitFor) assertions wait for the specified event to happen. They can be used for testing Ajax functionality. For example, you can wait for the value of an element on the page to be updated by an Ajax request. Table 11-2 shows a partial list of supported Selenium assertions. Table 11-2. Commonly Used Selenium Assertions

scala> round(dh)

Once your files are organized, it s time to create a specification file that describes the gem and provides RubyGems with enough information to create the final gem. Create a text file called string_extend.gemspec (or a filename that matches your own project name) in the main string_extend folder, and fill it out like so:

require 'rubygems' spec = Gem::Specification.new do |s| s.name = 'string_extend' s.version = '0.0.1' s.summary = "StringExtend adds useful features to the String class" s.files = Dir.glob("**/**/**") s.test_files = Dir.glob("test/*_test.rb") s.autorequire = 'string_extend' s.author = "Your Name" s.email = "your-email-address@email.com" s.has_rdoc = false s.required_ruby_version = '>= 1.8.2' end

<console>:8: error: type mismatch; found : Holder[Double] required: Holder[java.lang.Number]

This is a basic specification file. The specification file is effectively a simple Ruby script that passes information through to Gem::Specification. The information it provides is mostly simple, but let s look at a few key areas. First you define the name of the gem, setting it to 'string_extend':

assertLocation (location) assertTitle(title) assertTextPresent(text)

So, invariant type parameters protect us when we have mutable data structures like arrays. Let s move on to covariant parameter types.

s.name = 'string_extend'

Next, you define the version number. Typically, version numbers for Ruby projects (and for Ruby itself) contain three parts in order of significance. Early versions of software, before an official release, perhaps, often begin with 0, as in 0.0.1 here: