added edge cases tests for array:insert-before
added edge cases tests for array:insert-before

windauer/exist,eXist-db/exist,lcahlander/exist,dizzzz/exist,eXist-db/exist,dizzzz/exist,adamretter/exist,lcahlander/exist,dizzzz/exist,windauer/exist,adamretter/exist,lcahlander/exist,wolfgangmm/exist,windauer/exist,adamretter/exist,wolfgangmm/exist,ambs/exist,ambs/exist,eXist-db/exist,wolfgangmm/exist,dizzzz/exist,windauer/exist,adamretter/exist,windauer/exist,lcahlander/exist,eXist-db/exist,ambs/exist,wolfgangmm/exist,eXist-db/exist,lcahlander/exist,adamretter/exist,dizzzz/exist,ambs/exist,lcahlander/exist,ambs/exist,wolfgangmm/exist,ambs/exist,eXist-db/exist,wolfgangmm/exist,windauer/exist,dizzzz/exist,adamretter/exist