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step: Runs the next line of the program. step literally steps through the program line by line, executing a single line at a time. After each step, you can check variables, change values, and so on. This allows you to trace the exact point at which bugs occur. Follow step by the number of lines you wish to execute if it s higher than one, such as step 2 to execute two lines. cont: Runs the program without stepping. Execution will continue until the program ends, reaches a breakpoint, or a watch condition becomes true. break: Sets a breakpoint at a particular line number, such as with break 3 to set a breakpoint at line 3. This means that if you continue execution with cont, execution will run until line 3 and then stop again. This is useful for stopping execution at a place where you want to see what s going on. watch: Sets a condition breakpoint. Rather than choosing a certain line upon which to stop, you specify a condition that causes execution to stop. For example, if you want the program to stop when x is larger than 10, use watch x > 10. This is perfect for discovering the exact point where a bug occurs if it results in a certain condition becoming true. quit: Exits the debugger. A simple debugging session with your debugtest.rb code might look like this:
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# ruby -r debug debugtest.rb Debug.rb Emacs support available. debugtest.rb:1:i = 1 (rdb:1) list [-4, 5] in debugtest.rb => 1 i = 1 2 j = 0 3 until i > 1000000 4 i *= 2 5 j += 1 (rdb:1) step debugtest.rb:2:j = 0 (rdb:1) i 1 (rdb:1) i = 100 100 (rdb:1) step debugtest.rb:3:until i > 1000000 (rdb:1) step debugtest.rb:4: i *= 2 (rdb:1) step debugtest.rb:5: j += 1 (rdb:1) i
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200 (rdb:1) watch i > 10000 Set watchpoint 1:i > 10000 (rdb:1) cont Watchpoint 1, toplevel at debugtest.rb:5 debugtest.rb:5: j += 1 (rdb:1) i 12800 (rdb:1) j 6 (rdb:1) quit Really quit (y/n) y This debugging session demonstrates stepping through the code, inspecting variables, changing variables in situ, and setting watch points. These are the tools you ll use 99 percent of the time while debugging, and with practice the debugging environment can become a powerful tool, much like irb. However, many Ruby developers don t use the debugger particularly often, as its style of debugging and its workflow can seem a little out of date compared to modern techniques such as test-driven development and unit testing, which we ll look at next. If the debugger seems like it could be useful, testing will make you drool.
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Testing is a powerful part of modern software development, and can help you resolve many development snafus. Without a proper testing system in place, you can never be confident that your app is bug-free. With a good testing system in place, you might only be 99 percent bug free, but it s a significant improvement. Previously, we ve looked at how to handle explicit errors, but sometimes your programs might perform oddly in certain situations. For example, certain data might cause an algorithm to return an incorrect result, or invalid data might be produced that, although invalid, does not result in an explicit error. One way to resolve these problems is to debug your code, as you ve seen, but debugging solves only one problem at a time. It s possible to debug your code to solve one problem, but create many others! Therefore, debugging alone has become viewed as a poor method of resolving bugs, and testing the overall functionality of code has become important. In the past, users and developers might have performed testing manually by performing certain actions and seeing what happens. If an error occurs, the bug in question is fixed and testing continues. Indeed, there was a time when it was it commonplace solely to use user feedback as a testing mechanism! However, things have changed quickly with the rapidly growing popularity of testdriven development (also often known as test-first development), a new philosophy that turns software-development practices on their head. Ruby developers have been at the forefront of promoting and encouraging this technique.
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