Pytest Tutorial - How to Test Python Code

Рет қаралды 153,057

Күн бұрын

Learn how to use pytest, the powerful testing framework for Python. Throughout this course you'll gain a deep understanding of pytest's features, best practices, and the nuances of writing effective tests. And at the end, you'll learn how you can use ChatGPT to help you write tests quicker.
✏️ Course developed by @iamrithmic
𝑿 / rithmio
⭐️ Contents ⭐️
(0:00:00) Introduction
(0:06:06) Our First Tests
(0:19:28) Class-based Tests
(0:29:49) Fixtures
(0:41:10) Mark & Parametrize
(0:55:24) Mocking
(1:13:16) Testing with ChatGPT
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Пікірлер: 91

@iamrithmic 7 ай бұрын

Thank you again for the opportunity to collaborate! I hope you folks found this insightful :)

@diana_str 5 ай бұрын

How did you make it show in terminal just (venv) -> file location name?

@valorien1 2 ай бұрын

Thanks for the course. I think you're wrong about `setup_method()` and `@pytest.fixture`: The setup flows or objects they define will be executed/recreated again for each and every test case. This doesn't actually save time or computation resources.

@goodman4093 Ай бұрын

PLS STOP USING BLACK BACKGROUND FOR TUTORIAL!!!

@xsamueljr 7 ай бұрын

I was literally studying unit testing in Python, and suddenly this video pops up in my feed! Amazing, high quality, free content, as always. Thanks! ❤

@deeksha6514 3 ай бұрын

Amazing tutorial on Pytest over the whole KZfaq !!

@Melkii377 6 ай бұрын

Thank you for helping to understand how fixtures work 😊

@itsmemani9 7 ай бұрын

Best tutorial for the pytest - crisp and clear Thanks for posting this

@Sane_Circle 4 ай бұрын

Great tutorial This tutorial made me fall in love with pycharm really. great explanation

@ThundaAaAaAaAaAh 7 ай бұрын

exactly what I wanted to get better at, thanks again

@riyazahmed7907 5 ай бұрын

Great lecture! Keep up the good work!

@polaw7204 7 ай бұрын

Thank you for this course.

@parthib_deb23 3 ай бұрын

Straight to the Topic !! Top-Notch Descriptions of Every part of Pytest. Love this Video . Will recommend it surely 😇😇😇🤗🤗.

@iamrithmic 2 ай бұрын

This comment means a lot, thank you :)

@sriharsha580 7 ай бұрын

Thank you, Can we have one such session on A/B testing too and sanity checks using statistical tests for ML models?

@ranever-hadani3603 18 күн бұрын

This video is friggin amazing, thanks, I leant a ton!

@skafiend4319 3 ай бұрын

awesome tutorial, reading the documentation was quite excruciating :D this format is much much better. thank you

@iamrithmic 2 ай бұрын

You are more than welcome :)

@GameWorldRS 4 ай бұрын

Great tutorial! Also I think Harry was the "teacher" for the defense against the dark arts class in like book 6 (?) in that underground class that they made to prepare

@nicesong67 6 ай бұрын

Great tutorial ! @iamrithmic how do you refactor function positional arguments to named parameters automatically ? I can't seems to find the information in the pycharm forum...

@lokeshwaran7671 7 ай бұрын

Thank you!

@amolsv 7 ай бұрын

Thanks!

@paulthomas1052 7 ай бұрын

Thanks for this video - very useful content with really great code / examples.

@edgarlip2 6 ай бұрын

Hi , awesome pytest intro !!! do you have the code in txt as well ?

@ugwuokwuchukwu1001 7 ай бұрын

Thanks to free code camp for this wonderful video. Please I would like you to make a video on how to create animation, comics and stuffs like that. ❤❤❤

@tadastadux 7 ай бұрын

great stuff, is source code available please?

@diana_str 5 ай бұрын

How did you make it show in terminal just (venv) -> file location name?

@Nomind2-3 7 ай бұрын

Obrigado por ajuda a fazer a internet um lugar melhor para aprender algo novo!!!

@paulopontovaz 6 ай бұрын

"We were expecting a raise but instead we got a test fail" - I feel ya

@iamrithmic 6 ай бұрын

😂😂

@yjc5805 2 ай бұрын

谢谢作者！

@lucasgabas3965 2 ай бұрын

What is the plugin that autocompletes the function keys?

@AlexBerkk 6 ай бұрын

great stuff, but one thing is bugging me - why he doesn't use "from" in his imports? from source import service instead of import source.service as service ? Is there something I don't know about imports?

@1deesa 5 ай бұрын

Some find it useful for readability. Imagine a long code, and in the middle of it you see some function. In this way you see immediately that it is external. If author of code used "from .. import .." construction you will need to jump (or scroll) to the import part of a file. upd: reread your question and it occurs to me that I answered not to it. But let stay, I guess.

@davidolonisakin9028 7 ай бұрын

🔥 lovely

@nitkarshchourasia2406 5 ай бұрын

🎯 Key Takeaways for quick navigation: 00:43 🧪 *Pytest is a testing framework for Python, catering to both beginners and professionals.* 01:10 🕵️ *Pytest's autodiscovery of tests allows easy identification based on naming conventions, requiring no explicit registration.* 02:34 📋 *Rich assertion introspection in Pytest provides detailed reports on test failures, aiding in debugging.* 03:13 ⚙️ *Pytest supports parameterized and fixture-based testing, allowing efficient test execution with various arguments.* 03:39 🤔 *Reasons to use Pytest include simplified syntax, rich assertion introspection, a powerful fixture system, compatibility with other testing libraries, and extensibility through plugins.* 06:12 🛠️ *Installation of Pytest involves using the command `pip install pytest`, with version 7.4.2 demonstrated in this example.* 08:55 🧪 *Writing basic Pytest tests involves creating functions with assertions to validate expected outcomes.* 16:17 🚨 *Pytest can test for specific exceptions using `with pytest.raises(ExceptionType)` to ensure the expected errors occur.* 19:32 🔄 *Transitioning to class-based tests involves creating classes, and Pytest provides setup and teardown methods for pre/post-test actions.* 23:16 🔄 *Pytest class-based tests can utilize setup and teardown methods to perform actions before and after each test method within the class.* 25:22 🐍 *Pytest command in terminal requires `-s` flag to print statements in setup and teardown methods.* 26:19 🛠️ *`setup` method in Pytest can be useful for creating common objects used in multiple test methods.* 28:20 🔄 *`teardown` method in Pytest can be used for cleanup tasks, like deleting objects, especially in more complicated test scenarios.* 29:43 🚀 *Overview of class-based tests in Pytest, demonstrating how to set up and use class-based tests with Pytest.* 35:14 🛠️ *Pytest fixtures allow creating reusable objects for tests, reducing redundancy and improving maintainability.* 39:31 🌍 *`conftest.py` file can be used to store and make fixtures globally accessible across different test files.* 41:12 🏷️ *Pytest marking allows adding metadata to tests, such as labeling them as slow, skipped, or expected to fail.* 47:47 🔄 *Pytest marks, including `skip`, `xfail`, and `slow`, provide additional information about test behavior and status.* 52:23 📊 *Parameterizing tests in Pytest allows running the same test logic with different sets of input values, improving test coverage and readability.* 54:58 🧪 *Parameterized testing in Pytest allows testing with different values without messy loops. Useful for testing the same scenario with different inputs.* 55:27 🎭 *Mocking is a powerful testing technique to isolate systems by replacing external dependencies with controlled implementations called mocks.* 56:51 🧱 *Mocking example: Creating a dummy database in Pytest, mocking a function using `patch`, and verifying expected behavior.* 01:12:19 🤖 *When to use mocking: Use it when tests depend on external programs with unpredictable results, like APIs, to ensure consistent test outcomes.* 01:13:27 🤖 *Exploring AI for writing tests: Brief mention of using artificial intelligence for test automation and an invitation to try ChatGPT on OpenAI's platform.* 01:22:05 🎭 *Themed Testing: Using fixtures and parameterized tests, the code is tested with a Harry Potter theme, including students like Ron Weasley and a class named "Defense Against the Dark Arts."* 01:23:16 🐞 *Debugging: When a test fails, it's essential to review and understand the code and test conditions. In this case, an oversight in the code logic was identified and corrected.* 01:24:47 🤖 *ChatGPT 4: The tutorial briefly mentions using ChatGPT 4 for enhanced AI capabilities in generating test cases, suggesting it's available for "Plus" users.* 01:25:14 🤯 *AI Understanding: ChatGPT 4 demonstrates improved comprehension by providing a more detailed and context-aware set of test cases with a Harry Potter theme.* 01:26:38 🔄 *Consistency: When updating the test prompt, ensure all relevant details are modified to avoid inconsistencies and obtain accurate results.*

@osasomoregbee4878 4 ай бұрын

Not all hero wear capes. Some are just computer programmers 😭😭🫡🫡🫡🫡🫡🫡🫡🫡🫡🫡🫡🫡🫡🫡🫡🫡🫡🫡🫡🫡

@bpospanov 5 күн бұрын

Great job brother

@AdityaSharma-em8vz 7 ай бұрын

Worth the time

@hotspot8688 7 ай бұрын

Why?

@hotspot8688 7 ай бұрын

Now i see why, it is really basic but might be useful for beginners.

@SteveAcomb 7 ай бұрын

always bizarre to see you post these sorts of videos right as their topics are most relevant to me 😂 guess you’re pretty tuned into the zeitgeist lol

@deeksha6514 3 ай бұрын

Why are not we using MonkeyPatching built inside Pytest and instead using unittest ?

@tharulinsara7136 7 ай бұрын

GREAT😍

@mostafaboras 4 ай бұрын

i don't why but i think that my vs code is crazy or when you imported source.my_functions as my_functions it telling me that there is no such module called my_functions pretty crazy right!!!!

@rudranarayansamal4168 3 ай бұрын

I got the same issue, it was solved when i created empty __init__.py files inside the package

@AntonioMartinez-sq2gp 7 ай бұрын

I would like to learn coding. I would need to start with step 1. Can anyone point me in the right direction. What to learn first?

@StaticBlaster 7 ай бұрын

start with learning some discrete math and set theory. that will train your brain to think discretely and logically - the way computers "think" and process information. Then I would recommend learning JavaScript, HTML, and CSS. and finally learn python from variables to OOP concepts like classes, objects, inheritance, polymorphism, etc.

@AntonioMartinez-sq2gp 7 ай бұрын

@StaticBlaster .... Thank You Very Much!! I hope you have a blessed day!!

@StaticBlaster 7 ай бұрын

@@AntonioMartinez-sq2gp You're very welcome, and you too, bro.

@ccc_ccc789 7 ай бұрын

The best way to learn is for you to identify what is it you wanted to create or solve. Anything that will make you wake up at night because you wanted to finish it. Next, break down the components of the problem in to small parts. Next, write a software function to solve each small parts of the problem. Then, use chatgpt to give you a sample code that is close enough to the software function that you are trying create. It is similar to building a Lego. It is only after you tried programming yourself that will start to appreciate the books or documentations. In other words, just do it. A good analogy is when a small child is trying learn to speak for the first time. They don't start with learning the abcs, they just do it. They try to mimic what they here again and again. It's only later in life that children learn the abcs to polish they're language.

@AntonioMartinez-sq2gp 7 ай бұрын

@@ccc_ccc789 .... Thank You

@julianzurawski4944 7 ай бұрын

wow 😊

@devsuniversity 4 ай бұрын

Who is the guy speaking at the first 30 seconds?

@TheFutureAwareness 5 ай бұрын

so we need to install python, pytest, and pycharm?

@wabschall 4 ай бұрын

If on Windows: Yes & No. - You will need to install Python, then PyTest. - You do not specifically need to install Pycharm, but it's a decent IDE. Personally I use Visual Studio Code for all of my work. Pycharm is specifically made for python so it will have the most "out-of-the-box" compatibility with Python. If on Linux: - Python is installed on most Linux Distros by default. Go to your terminal and type in "python --version". If you get an error: It's not installed. If not, it is. - After that you do the same thing as with Windows. Install PyTest, get an IDE of choice.

@gh58m8kanzba 5 ай бұрын

00:55:26

@thiyagua3188 2 ай бұрын

Nice

@relojsaturno 5 ай бұрын

But what is the point of testing a function with results that we know in advance?

@wabschall 4 ай бұрын

Thought experiment: Can I test a use-case that I haven't thought of yet? I would argue no. The first step to testing anything is to identify parameters I want to test. Think about it like this. Part of good coding is Error Handling; how to handle when things aren't correct in a calculation, input, or something else. Testing is a way to do this without actually having to run the code each time. I, as the programmer, know what my inputs should look like, and what my result should look like. The test just makes sure my code is doing what I think.

@relojsaturno 4 ай бұрын

@@wabschallBut my friend, if when you are writing the test it occurs to you that the function can receive an elephant as an argument, you modify the function so that it handles an elephant. It is conceptually like the impossibility of deceiving oneself. I still do not understand. Thanks for answering

@cjr-en4wr 4 ай бұрын

@@relojsaturno a block of code that works today might not work next week as code bases are forever being updated by the team - when pushing out an update to your website you can run all the tests to make sure everything is still ok.

@relojsaturno 4 ай бұрын

@@cjr-en4wr It would be good if in the video they simulated a slightly more real case, where a test discovered an error

@silanoktay559 7 ай бұрын

Neden Türkçe altyazılı yok lütfen

@exiviuz2428 7 ай бұрын

❤❤❤

@BlackTeenMonkey 7 ай бұрын

Guys, I think we all have a similar resume xD

@Shriramkrishnhari 7 ай бұрын

👍

@corybilyeu4490 29 күн бұрын

where's the code repo ?

@luisrnandezc 4 ай бұрын

Good tutorial except the Mocking section which was extremely shallow. How the mock test is ever going to fail if you are the one defining the return value of the function/method and then are comparing it with the same exact value? Obviously is always going to pass.

@viathorr 28 күн бұрын

55:45

@ak.murodov 7 ай бұрын

Can you create a Dynamic Programming course with Python. Thanks beforehand

@Wineblood 7 ай бұрын

pytest makes me want to write my own test framework.

@tarunikasundarraj4848 2 ай бұрын

13:12:00

@tarunikasundarraj4848 2 ай бұрын

5:31

@march1956 7 ай бұрын

@laodrofotic7713 Ай бұрын

to me it shows some parts of this you have memorized without properly understanding it, and this is so clear once you try to explain it. either that or you are lacking proper communication skills. Either way it amazes me to see how many people want to make videos about things they dont even understand themselves while people that do dont make videos at all.

@machinimaaquinix3178 4 ай бұрын

A much better (and shorter and more realistic) intro to Pytest: kzfaq.info/get/bejne/j8igfrB6utDae2w.html

@irabor18 4 ай бұрын

Thank you, this tutorial was just okay, wasn't it?ha

@vcool 7 ай бұрын

There is nothing that pytest does that Python's native unittest itself doesn't also do (except support plugins that painfully keep breaking).

@tomasohara 4 ай бұрын

unittest is comatose!

@manoharrathod6541 2 ай бұрын

I just suggest you, please leave teaching to someone and always teach yourself only as now in this video, you are teaching yourself. Useless teaching, it is just for who muggs the code. Waste of time😡