Tester should delete all entities from TestTable before running tests

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Migrated from Gitlab issue 14

Tester should empty table of entities so that tests can run in a clean environment. Contamination of entities can result in false - negative failed tests.

Suggested Pseudo - Implementation:

Vector<pairs> entities = Get all entities from table
for object in entities:
    delete object
    check to ensure deletion
if(Get all entities .size() > 0):
    error deleting objects stop tests