The longest form of the game has been played between Test nations since international cricket began for women in the Australian summer of 1934/5. The two combatants in that series, England and Australia, are the only nations currently playing this multi day format.
Ten teams have played Test cricket since its inception but three of those, Ireland, Netherlands and Sri Lanka, have only played one Test each. The main nations, the “Golden Triangle” according to former Test cricketer and author Joan Hawes, have been Australia, England and New Zealand. The next strongest teams have been India and West Indies.