By Harry J. W. Percival
Through taking you thru the advance of a true net program from commencing to finish, this hands-on advisor demonstrates the sensible benefits of test-driven improvement (TDD) with Python. You'll how to write and run assessments earlier than construction every one a part of your app, after which boost the minimal volume of code required to cross these assessments. the outcome? fresh code that works.
In the method, you'll research the fundamentals of Django, Selenium, Git, jQuery, and ridicule, in addition to present internet improvement suggestions. If you're able to take your Python abilities to the following point, this e-book in actual fact demonstrates how TDD encourages easy designs and evokes confidence.
• Dive into the TDD workflow, together with the unit test/code cycle and refactoring
• Use unit assessments for periods and features, and sensible exams for consumer interactions in the browser
• study whilst and the way to take advantage of mock items, and the professionals and cons of remoted vs. built-in tests
• try out and automate your deployments with a staging server
• practice assessments to the third-party plugins you combine into your site
• Use a continual Integration atmosphere to run your exams immediately
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And even lifting a full bucket is pretty easy at first. But after a while, you’re going to get tired. TDD is like having a ratchet that lets you save your progress, take a break, and make sure you never slip backwards. That way you don’t have to be smart all the time. Figure 4-1. Test ALL the things (original illustration source: Allie Brosh, Hyperbole and a Half) OK, perhaps in general, you’re prepared to concede that TDD is a good idea, but maybe you still think I’m overdoing it? Testing the tiniest thing, and taking ridiculously many small steps?
Selenium is reasonably good at waiting for pages to complete loading before it tries to do anything, but it’s not perfect. The implic itly_wait tells it to wait a few seconds if it needs to. When asked to find something on the page, Selenium will now wait up to three seconds for it to appear. Don’t rely on implicitly_wait; it won’t work for every use case. It will do its job while our app is still simple, but as we’ll see in Part III (eg, in Chapter 15 and Chapter 20), you’ll want to build more so‐ phisticated, explicit wait algorithms into your tests once your app gets beyond a certain level of complexity.
26 | Chapter 3: Testing a Simple Home Page with Unit Tests Reading Tracebacks Let’s spend a moment talking about how to read tracebacks, since it’s something we have to do a lot in TDD. ] The first place you look is usually the error itself. Sometimes that’s all you need to see, and it will let you identify the problem immediately. But sometimes, like in this case, it’s not quite self-evident. The next thing to double-check is: which test is failing? Is it definitely the one we expected, ie, the one we just wrote?