Can you explain the concept of Coverage in the context of software testing?

Coverage in testing is a metric that shows which part of the code was executed during test runs. It helps to understand how thoroughly the tests verify the program.

There are several types of coverage:

• Line coverage — how many lines were executed.
• Branch coverage — which logical branches (if/else) were taken.
• Function/method coverage — which functions were called.

For example, if you have a function with multiple conditions and your tests only check some of them, coverage will show that not all code is tested.

In Python, the coverage.py package is often used to measure coverage, which can be run as follows:

coverage run -m pytest
coverage report

This helps identify parts of the code that require additional tests.