Embedded map contribution buttons tests

Two new tests for contribution buttons on embedded map. 
It is important for us to test it automaticaly, because we discovered regression connected with this feature.
This is just to consider, as interactive maps are bigger and bigger and tests coverage is still increasing I would consider to split tests to different classes inside InteractiveMapsTests package, basing on functionalities like: EmbedMapTests, AddNewMapTests, AddPinTests etc.