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The idioms that pytest first introduced brought a change in the Python community because they made it possible for test suites to be written in a very compact style, or at least far more compact than was ever possible before. Pytest basically introduced the concept that Python tests should be plain Python functions instead of forcing developers to include their tests inside large test classes. See More
The fact that pytest uses it's own special routines to write tests means that you are trading convenience for compatibility. In other words, writing tests for pytest means that you are tying yourself to only pytest and the only way to use another testing framework is to rewrite most of the code. See More
Pytest can easily be extended with several hooks, and the same team develops a number of very useful plugins. For example, you install pytest-xdist, and parallel test execution just works, with all the same benefits you had with pytest (as opposed to having to use a separate test runner, for example) See More
A fixture is just a function that returns a value and to use a fixture you just have to add an argument to your test function. You can also use a fixture from another fixture in the same manner, so it's easy to make them modular. You can also parametrize fixture and every test that uses it will run with all values of parameters, no test rewrite needed. If your test uses several fixtures, all parameters' combinations will be covered. See More
With most other tools you have to use debugger or extra logging to find out where did some value came from in your test. Not with pytest! Pytest rewrites your test so that it can store all intermediate values that can lead to failing assert and provides you with very pretty explanation about what has been asserted and what have failed. See More
According to documentation at https://nose.readthedocs.io/en/latest/, nose may become unsupported. There is a successor project called Nose2 (https://github.com/nose-devs/nose2), but it does not support all the features of its predecessor and recommends considering pytest for those new to testing. See More
What MirageOS does in simple terms is to provide only the minimal needed for an app to run. It provides only the required network and hardware drivers needed to execute. Using this approach it minimizes the attack surface for potential hackers since they don't have any shell to log into or any other insecure cruft that other deployment methods, such as full operating systems have. See More