Effective PyCharm (2021 edition) Transcripts
Chapter: Unit testing
Lecture: Concept: Testing
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Let's review some of the core concepts around testing,
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python pytest and PyCharm. So we saw that we could write test methods that
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will exercise parts of our code assert things and verify that our code is working correctly
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We decided to use py tests because it's by far the most popular way to
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create tests in python. Notice a couple of things the naming matters.
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So the methods all start with test underscore and then they can have some huge long
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descriptive name, which is really good because if you see the short report,
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this test Passed or, this test failed basically.
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That's the description of the test.
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Right You never call these directly.
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So be generous on the names.
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Also notice the name of the file table underscore test tests plural.
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Never mind. It contains multiple tests that needs to be singular for pytest to
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discover it. And we put that file within a folder called tests and we can
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just right click on the test folder state run with py test boom,
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off it goes. We also saw under the python integrated tools and testing that there
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are multiple frameworks we might be using if you go in at a new configuration for
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a new project configuration, you run configuration basically you'll see there's actually a lot of
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options under this python test section.
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We also have talks. So under python test we've got Doc test Nose test
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pytest, twisted trial and unit test, 'tox' is more about setting up an environment than
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maybe running py tests for that environment like python 38 than 39 than 310
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Again, if you always want to run the same framework or at least
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have a default go over to the tools,
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then python integrated tools, testing and then choose the one you want.
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pytest or unit test is probably the most common choices here.
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Then we can just right click and say run pyest in a test file or
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in the test directory that will create the run configuration for the default thing.
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Super quick and easy. Once you run it will fire up the test runner.
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We've already seen the run test window throughout this course,
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but now we're seeing it run unit tests with a different output.
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Not just the terminal output, but this hierarchical thing.
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Understanding the tests, we dive into it a little bit here.
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We have the run tests. So rerun the tests as their selected down here.
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Right? You can say set up just the failing test and then click that to
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rerun it and so on. Or just run the default ones.
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This will show passing tests. This little toggle ignored test.
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There's a way to say pytest.skip.
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Like this might not be passing now,
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but let's just put it to the side and we'll come back to it.
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So that would show up here normally,
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but you can hide those here.
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We can rerun the failed tests only.
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And then interestingly this one, this one's wild.
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So if you turn that on.
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What this will do is anytime you make a change to files in the project,
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the test files or the files under test this is probably the most important aspect of
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it. If you make any change and save it within a second or two
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PyCharm, we'll just rerun that automatically like continuously as you type and press save it
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will just keep running the test and keep running the test and keep running the test
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That could be really useful if you just want to keep working and just sort
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of know red green, it's a thing currently working or is it currently broken according
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to the test to be honest.
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This is not something that I do the test take a little bit too long to
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run and I think it was just kind of stress me out to have those running
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all the time. I run the more on demand.
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But if this idea appeals to you,
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you just click that button and it will automatically run the test on every file,
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change locally. You can export the results or import the results here and that will
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let you compare them or share them with someone else.
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And there's other features as well.
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You can see the history, you can explore into the various pieces and see just
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the output for that test. It's a really nice test runnerfor the PyCharm.