How to define a JVM system property name using a placeholder from Run/Debug/Configuration with JUnit

Background/Situation

A user running a test with JUnit is trying to define a JVM system property in IntelliJ IDEA using a placeholder for the property name.

Question

How can I add -D${keyName} to test?

Answer

This can be achieved by the next steps:

1. Add a Path variable; go to "Settings | Appearance & Behavior | Path Variables", i.e., KEY_NAME with value KeyName

2. Go to "Run | Edit Configuration | JUnit". The "Run/Debug Configurations" dialog will be opened.

3. In the "Build and Run" section, select "Modify Options." This will open the "Add Run Options" dialog. Verify "Add VM Options" is selected otherwise select it to show the desired field.

4. Add the JVM property using the property name surrounded by "$", like: $KEY_NAME$ instead of ${KeyName}