Test Unit
With Test Units, you can create unit tests to be used in test plans. Unit testing is a method of software testing in which parts of a software are tested.
A unit is the smallest testable part of a software code. To create a unit, you have to split your code into multiple pieces. Then, these pieces (units) can be tested in a series of steps. Each unit can contain one or more steps, depending on the test requirement.
A step in the test unit is considered your test case. A test case contains the actual execution steps on how to perform the specific test.