http://www.tutorialspoint.com/junit/junit_environment_setup.htm
I have done everything like in this step by step tutorial and still when I try to write the line
import org.junit.*; The "junit" part is lighten red and the error message is "cannot resolve symbol "junit"".
The tutorial you are following seems to be written for command line usage. (Download jar, set classpath etc). So the same wouldn't work in IntelliJ. IDEs actually make these a lot easier.
To solve your current dilemma, try this. Place the cursor on the red 'junit' (which is basically a broken import) and choose "Add Junit4 to classpath". This will add the necessary junit jars that IDEA ships with to your classpath.
Open up your build.gradle and make sure JUnit is there
dependencies { testCompile 'junit:junit:4.12' // other dependencies... } And for a better link for Android-specifics, read Getting Started with Testing from the Android docs.
