What is the pytest framework

Pytest is a widely used Python testing framework that provides simple and easy-to-use interfaces and functions for writing and running various types of test cases, including unit tests, integration tests, and functional tests. The features of the pytest framework are: 1. Simple and easy to use, you can quickly start writing test cases; 2. Powerful assertion function, convenient to verify and compare test results; 3. Support multiple testing styles, choose the appropriate testing method according to project needs ; 4. Rich plug-in support; 5. Support for parallel testing; 6. Good community support, etc.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

Pytest is a widely used Python testing framework that provides simple and easy-to-use interfaces and functions for writing and running various types of test cases, including unit tests, integration tests, and functional tests.

The pytest framework has the following features and advantages:

1. Easy to use: pytest’s syntax is clear and concise, easy to learn and use, and you can quickly get started writing test cases .

2. Powerful assertion function: pytest provides a wealth of assertion functions and tools that can easily verify and compare test results.

3. Supports multiple testing styles: pytest supports functional programming, object-oriented programming and other testing styles. You can choose the appropriate testing method according to project needs.

4. Rich plug-in support: pytest has rich plug-in support, which can easily expand and customize testing functions.

5. Support parallel testing: pytest can easily implement parallel testing, thereby improving testing efficiency.

6. Good community support: pytest has extensive community support and documentation to help developers quickly solve problems and learn new features.

The steps to write test cases using the pytest framework are as follows:

1. Install pytest: You can install the pytest framework through the pip command.

2. Create a test file: Create a Python file starting with test_ in the project root directory, and then write test cases in it.

3. Writing test cases: When writing test cases, you need to define one or more test functions and use assertion functions in the functions to verify the test results.

4. Run test cases: Run the pytest command through the command line, specify the file or directory to be tested, and pytest will automatically find and run all test cases.

The pytest framework can easily perform integration testing and functional testing. When performing integration testing, you need to write some simulation code to simulate the dependencies of the code under test, and then write test cases to verify the interaction between the code under test and the simulated code. When performing functional testing, you need to write corresponding test cases for different functional modules of the code under test, and use simulated data or real data for testing.

The pytest framework provides many commonly used assertion functions and tools, some of which are commonly used: assert_equal(a, b), assert_not_equal(a, b), assert_in(a, b), assert_not_in(a, b ), assert_is(a, b), assert_is_not(a, b), assert_true(a), assert_false(a), etc. Additionally, fixtures can be used to manage test case dependencies and mock data.

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