Visit the junit-jupiter-api page on Maven Central to select your version and click the "Download" button to get the junit-jupiter-api-x.x.x.jar file.
Manually managing JARs can lead to "dependency hell" because junit-jupiter-api requires other libraries to run. Using a build tool automatically handles these transitive dependencies. org.junit.jupiter:junit-jupiter-api:5.10.2 - Maven Central junit-jupiter-api jar download
Go to File > Project Structure > Libraries , then click the "+" button and select the JAR file. Preferred Method: Using Build Tools Visit the junit-jupiter-api page on Maven Central to
org/junit/jupiter/junit-jupiter-api/5.3.1 ../ junit-jupiter-api-5.3.1-javadoc.jar 2018-09-11 04:48 795363 junit-jupiter-api-5.3.1- JUnit Jupiter API - Maven Repository junit-jupiter-api jar download