Test-driven development features
Test-driven development (or TDD, for short) is a popular software development practice that aims to improve code quality and maintenance. At a high level, TDD starts with a developer creating tests that describe the expected functionality of their change. The tests start in a failed state, and the developer can become confident that their implementation is correct when the tests finally pass.
Tests are often the first thing code reviewers look at when considering code changes (when contributing to pandas, tests are a must!). After a change with an accompanying test has been accepted, that same test will be re-run for any subsequent code changes, ensuring that your code base continues to work as expected over time. Generally, properly constructed tests can help your code base scale out, while mitigating the risk of regressions as you develop new features.
The pandas library exposes utilities that make writing tests for your pd.Series and pd...
