Menu View -> Tool Window : various tool windows
^h - hierarchy
Structure - cmd+7
Java Doc - F1
File -> Project Structure -> Project Settings -> Project -> Project SDK
Run -> Edit Configurations -> "+" -> Maven (done, change nothing)
Run:
all tests: "Run" menu, or right click the project, "Run All Tests" etc.
a single test: right click the test, "Run", "Debug", "Run with Coverage"