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And instead of looking at the screen to see what was on it, Mark kept his attention focused on the jurors, making eye contact with each person throughout the presentation Beyond the PowerPoint slides, Mark also used a range of other media and physical props to engage with the audience over the course of the presentation At times, he switched the screen to a special document projector, where he displayed physical paper documents and highlighted passages on the pages with a yellow marker as he explained the signi cance of the evidence Later he used a large paper ip chart that he calls a double-wide, where he wrote out key terms and concepts with large markers Sometimes he switched from the slides to a brief video that illustrated a point.

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Luckily, Ruby comes with a library, Test::Unit, that makes testing easy and organizes test cases into a clean structure. Unit testing is the primary component of test-driven development, and means that you re testing each individual unit of functionality within a program or system. Test::Unit is Ruby s official library for performing unit tests. One of the benefits of Test::Unit is that it gives you a standardized framework for writing and performing tests. Rather than writing assertions in an inconsistent number of ways, Test::Unit gives you a core set of assertions to use. Let s take the titleize method from before to use as a demonstration of Test::Unit s features and create a new file called test_titleize.rb:

class String def titleize self.gsub(/\s(\w)/) { |letter| letter.upcase }.gsub(/^\w/) do |letter| letter.upcase end end end require 'test/unit' class TestTitleize < Test::Unit::TestCase def test_basic assert_equal("This Is A Test", "this is a test".titleize) assert_equal("Another Test 1234", "another test 1234".titleize) assert_equal("We're Testing", "We're testing".titleize) end end

The pass statement does nothing, which can be useful as a placeholder, for example The del statement is used to delete variables or parts of a datastructure, but cannot be used to delete values The exec statement is used to execute a string as if it were a Python program The built-in function eval evaluates an expression written in a string and returns the result..

Other times he used physical props such as a plastic model of a heart held up in his hand to teach jurors the science behind heart attacks Mark used different types of media to keep things varied and interesting throughout the presentation and to keep the experience from feeling too slick and produced But after using each type of media, Mark always returned to the PowerPoint presentation on the 10-foot screen because it was a visually unifying tool he could use to tie everything together and move the story forward The shifting and dissolving images holding the audience s interest on the large screen seamlessly came together with Mark s physical presence, and his voice tied everything together.

First you include the titleize extension to String (this could be done using require if it s in a separate file). Next you load the Test::Unit class using require. Finally you create a test case by inheriting from Test::Unit::TestCase. Within this class you have a single method (though you can have as many as you like to separate your tests logically) that contains three assertions, similar to the assertions made in the previous section. If you run this script, you ll see the tests in action:

Loaded suite test_titleize Started . Finished in 0.000363 seconds. 1 tests, 3 assertions, 0 failures, 0 errors

In the Angleton courtroom, PowerPoint had taken on a new role it was now a powerful, persuasive backdrop that would have a major impact on the jurors in the eye of the PowerPoint storm in this Angleton courtroom..

Part of the artistry of programming is in being able to turn your ideas into computer programs. Once you become proficient with a programming language, you can turn your ideas directly into code. However, before you can do this, you need to see how Ruby understands real-world concepts itself, and how you can relay your ideas into a form that Ruby appreciates.

chr(n) eval(source[, globals[, locals]]) enumerate(seq) ord(c) range([start,] stop[, step]) reversed(seq) sorted(seq[, cmp][, key][, reverse]) xrange([start,] stop[, step]) zip(seq1, seq2,...)

Ruby is an object-oriented programming language. In the simplest sense, this means that your Ruby programs can define and operate upon concepts in a real-world fashion. Your program can contain concepts such as people, boxes, tickets, maps, or any other concept you want to work with. Object-oriented languages make it easy to implement these concepts in a way that you can create objects based upon them. As an objectoriented language, Ruby can then act upon and understand the relationships between these concepts in any way you define.