Pytest interface automated testing framework | introduction to fixture of pytest

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Official words ：

https://docs.pytest.org/en/latest/explanation/fixtures.html#about-fixtures

pytest fixtures Designed to be explicit 、 Modular and scalable

What is? fixtures

In the test ,fixture Provides defined , Reliable and consistent context . This may include the environment （ for example , Configure the database with known parameters ） Or content （ for example , Data sets ）

Fixtures Defines the steps and data that make up the test preparation phase . stay pytest in , They are functions defined for these purposes . They can also be used to define the test execution phase ; This is a powerful technique for designing complex use cases .

The test function is accessed by fixtures Set up the service , Status or other operating environment . For each used by the test function fixture, Usually, there is a parameter in the definition of the test function （ stay fixture Post naming ）.

We can use modifiers @pytest.fixture To tell pytest A particular function is a fixture.

Illustrate with examples ：

import pytest

@ pytest.fixture
def first_fix():
    return ["a"]

def test_str(first_fix):
    #  The test execution 
    first_fix.append("b")
    #  Assertion 
    assert first_fix == ["a", "b"]
    print(first_fix)


if __name__ == '__main__':
    pytest.main(["-s"])