unit tests using 2 ways of fake_data

first we built a class to check wheter a given table name is a database table or not (DD02L-TABCLASS = 'TRANSP'). Then we created unit tests and used real data base acccess for "testing".

Unit test using IF_OSQL_TEST_ENVIRONMENT

to get rid of the the database access we used the Open SQL Test Environment feature (Available from Release 7.52). https://sapcodes.com/2018/09/29/unit-test-with-sql-inject-sql-fake/

unit test using Dependency Injection

To also show how dependency injection works, we created a new Data Access Object (DAO) to read the repository data. Afterwards we created another class that provided fake data. Finally we built a GET_INSTANCE method to get the right instance.