How do I install pytest?

### Step 1: Install Pytest Pytest is a popular testing framework for Python. To install it, ensure you have Python 3.10+ or PyPy3 installed. Run the following command in your terminal: ```bash pip install pytest ``` This installs the latest version (as of December 2025, version 9.0.2). Verify installation by running `pytest --version`.

How do I write your first test?

### Step 2: Write Your First Test Create a new file named `test_sample.py` in your project directory. Add the following code: ```python def inc(x): return x + 1 def test_answer(): assert inc(3) == 5 ``` This defines a simple function `inc` and a test function `test_answer` that checks if `inc(3)` returns 5 (it will fail, demonstrating pytest's assert reporting). Test files must start with `test_` and test functions with `test_`.

How do I run and debug tests?

### Step 3: Run and Debug Tests In the terminal, navigate to the directory containing `test_sample.py` and run: ```bash pytest ``` Pytest will auto-discover and execute the test. You'll see output like: ``` ========================= test session starts ========================== platform linux -- Python 3.x.y, pytest-9.x.y, pluggy-1.x.y rootdir: /path/to/dir collected 1 item test_sample.py F [100%] =================================== FAILURES =================================== ______________________________ test_answer _______________________________________ def test_answer(): > assert inc(3) == 5 E assert 4 == 5 E + where 4 = inc(3) ``` This shows detailed failure info. Fix the test by changing `assert inc(3) == 4` to pass.

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Step-by-Step Guide

Step 1: Install Pytest

Pytest is a popular testing framework for Python. To install it, ensure you have Python 3.10+ or PyPy3 installed.

Run the following command in your terminal:

pip install pytest

This installs the latest version (as of December 2025, version 9.0.2). Verify installation by running pytest --version.

Why this step matters:

-Improves search rankings for Python testing queries
-Ensures reliable setup for writing and running tests efficiently

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🌐 Helpful Websites

Pytest Official Documentation

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Comprehensive guide to pytest features, fixtures, and plugins

Pytest GitHub Repository

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Source code, issues, and community contributions for pytest

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Pytest

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Python testing framework for writing and running tests

How to Use Pytest for Python Unit Testing Guide