Refactore License Test to remove duplicated code

[rainer-exxcellent]

The license tests use similar function with similar code.
Move this functions to a library and remove the duplicated code.

#356 Test 6.1.55
#363 Test 6.2.43
#364 Test 6.2.44
#365 Test 6.2.45
#366 Test 6.2.46
#307 Test 6.3.17