Packages 
Package Description
org.junit.jupiter.api
JUnit Jupiter API for writing tests.
org.junit.jupiter.api.condition
Annotation-based conditions for enabling or disabling tests in JUnit Jupiter.
org.junit.jupiter.api.extension
JUnit Jupiter API for writing extensions.
org.junit.jupiter.api.function
Functional interfaces used within JUnit Jupiter.
org.junit.jupiter.api.io
IO-related support in JUnit Jupiter.
org.junit.jupiter.api.parallel
JUnit Jupiter API for influencing parallel test execution.