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April Workshops. Lauren leads the archiving of UNT websites and works with federal agencies to harvest and store web content. He works in the area of digital libraries with an interest in digital preservation, Web archiving, and management of metadata.

On top of daily use of the tools being taught in the workshop, he also has tutoring experience from his work at NCTC. Kristy Phillips is a Ph. She is interested in using machine learning to study and preserve low-resource languages. YSC session This cookies is set by Youtube and is used to track the views of embedded videos.

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This cookies is set by Youtube and is used to track the views of embedded videos. This cookie is set by Hubspot and is used for tracking visitors. This cookie is installed by Google Analytics. As Steve McConnell said, trying to improve the quality of software by doing more testing is like trying to lose weight by weighing yourself more often. But a good set of tests will help you track down bugs more quickly, which in turn speeds up development.

It's also important to understand that testing can only do so much. For example, suppose you're testing a function that compares two 7-digit phone numbers. And that's only one simple function: exhaustively testing a real program with hundreds or thousands of functions, each taking half a dozen arguments, would take many times longer than the expected lifetime of the universe.

And how would you actually write 10 14 tests? More importantly, how would you check that the tests themselves were all correct?

In reality, "all" that testing can do is show that there might be a problem in a piece of code. If testing doesn't find a failure, there could still be bugs lurking there that we just didn't find. And if testing says there is a problem, it could well be a problem with the test rather than the program.

So why test? Because it's one of those cases where something that shouldn't work in theory is surprisingly effective in practice. It's just like mathematics: any theorem proof might contain a flaw that just hasn't been noticed yet, but somehow we manage to make progress. The obstacle to testing isn't actually whether or not it's useful, but whether or not it's easy to do. If it isn't, people will always find excuses to do something else.

It's therefore important to make things as painless as possible. In particular, it has to be easy for people to:. If a testing tool says that code is working when it's not, or reports problems when there actually aren't any, people will lose faith in it and stop using it.

Let's start with the simplest kind of testing. A unit test is a test that exercises one component, or unit, in a program. Ideally, this just involves calling a function, but some tests may involve more. If we don't know the expected result, we can't tell whether the test passed or failed. As we'll see in a couple of episodes, defining fixtures and expected results can be a good way to design software.

The first three parts of the unit test are used over and over again. The fourth part is the actual result …. As with the actual result, this could be different each time we run the test. So much for terminology: what does this all look like in practice?

It returns True if its second argument is a prefix of the first, i. We'll build a simple set of tests for this function from scratch to introduce some key ideas. Then later introduce a Python library that can handle the things that are done the same way each time. Let's start by testing our code directly using assert. Here, we call the function four times with different arguments, checking that the right value is returned each time.



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