Development with the Force.com Platform: Building Business Applications in the Cloud, Third Edition

Unit Tests in Apex

Testing Apex code consists of writing and executing unit tests. Unit tests are special methods written to exercise the functionality of your code. The goal of testing is to write unit tests that execute as many lines as possible of the target code. The number of lines of code executed during a test is called test coverage and is expressed as a percentage of the total lines of code. Unit tests also typically perform some pretest preparation, such as creating sample data, and posttest verification of results.