Testing

Testing

Introduction

Testing allows you to ensure your application works the way you think it does, especially as your codebase changes over time. If you have good tests, you can refactor and rewrite code with confidence. Tests are also the most concrete form of documentation of expected behavior, since other developers can figure out how to use your code by reading the tests.

Automated testing is critical because it allows you to run a far greater set of tests much more often than you could manually, allowing you to catch regression errors immediately.

Types of tests

Entire books have been written on the subject of testing, so we will simply touch on some basics of testing here. The important thing to consider when writing a test is what part of the application you are trying to test, and how you are verifying the b