For anyone who does development, unit testing is a must. Writing tests for your code is essential to preventing regressions of functionality, and allows you to easily make sure that when adding a new feature, you're not breaking something else that had previously worked.
With web applications this is a little more difficult because of the interactive component to web testing -- to test an actual browser interface you typically need a person clicking around and testing things. Unit testing works great for backend code, but not so much for the frontend human interface.
Recently, a new application for OS X was made available: Fake. Fake is a tool that helps you automate interactions with a website. This can be for testing, for doing tedious and repetitive tasks, or for automating other web-based processing.
Fake is a lot like Automator in that it allows you to create workflows within a GUI. This is done by dragging actions sequentially into the workflow. There are different actions for various things: loading URLS, opening links in other tabs, clicking HTML elements, filling in HTML fields, and so forth. There are even actions that allow you to execute scripts (UNIX or AppleScript), send emails, and do if/else testing (do something if a certain condition is true, otherwise do something else).
It operates by having a WebKit-based browser window as the primary window pane, with the list of actions on the side. This allows you to inspect elements, so you can explicitly tell the workflow action what fields to operate on.
For instance, if you wanted to perform a login action, you would need four workflow items: "Load URL" to load the web page, "Set Value of HTML Element" for the username login field, another "Set Value of HTML Element" for the password field, and finally "Click HTML Element" which would click the login button.
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Surprisingly, Fake is quite easy to use. If you are at all familiar with Automator, Fake feels right at home. The demo version only allows you to add eight actions to a workflow, which makes it difficult to really get a feel for what is possible with Fake. It also does not allow you to save workflows you create. It would be nice if they allowed an unrestricted time-based trial in order to really allow someone to get into it and do some real testing. At $29.95USD, Fake isn't cheap, but if you do serious web development, it is a bargain. I really do wish the developers would make it easier to really give Fake a good trial, and this is really the only down-side to Fake that I've come across so far.
For any serious web developer, Fake would make a great addition to the arsenal of unique web development tools available on the Mac. Plenty of tools exist to save time in the development stages, but this is the only one I know of that can save considerable time in the testing stage of web application development.
Vincent Danen works on the Red Hat Security Response Team and lives in Canada. He has been writing about and developing on Linux for over 10 years and is a veteran Mac user.