ABAP Unit Naming Conventions 
The name of an ABAP Unit class and test method appear in test failure messages. Class and method names should therefore:
Describe what is being tested
Differentiate between tests.
The table below suggests naming conventions for prefixes for the different types of ABAP Unit test classes and helper classes. The naming conventions are not binding. But they help to differentiate between production and test classes in a class pool.
Suggested Prefix |
Type of Class |
LTC_ |
Local ABAP Unit test class (FOR TESTING...) |
LTD_ |
Local Test double |
LTH_ |
Local test utilities class |