JUnit on IntelliJ not working - intellij-idea

Question

I tried setting up JUnit 5 on my INtelliJ IDEA Community Edition 2018.2. The jar was downloaded but I am getting Cannot resolve symbol Assertions on importing
import static org.junit.jupiter.api.Assertions.*;
Error

Answer 1

Are you trying to use the JUnit assertions in a regular app class rather than a test class?
Delete <scope>test</scope>
When a Maven dependency carries a scope element with a value of test, that means you cannot use that library outside of your test-specific source package/folder.
If you are trying to call JUnit from code in your example project’s src/main/java/… folder hierarchy, you will see that error. If you call JUnit from src/test/java…, you will see success.
To enable JUnit in the src/main/java/… folder hierarchy, delete the scope element in your POM dependency. So this:
<!-- https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter -->
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter</artifactId>
<version>5.4.0-RC1</version>
<scope>test</scope>
</dependency>
…becomes this:
<!-- https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter -->
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter</artifactId>
<version>5.4.0-RC1</version>
</dependency>
By the way, note that as of 5.4.0 of JUnit, we can specify the new and very convenient single Maven artifact of junit-jupiter which in turn will supply 8 libraries to your project.