Not able to run JUnit

Is anything wrong with this code? Not getting Junit when I do RunAs..

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package TestCases;

public class UnderstandingAssertions {

public void findfriendslistfacebook(){

int actualfriendlistfacebook =100;
int expectedfriendlistfacebook = 101;

if(actualfriendlistfacebook == expectedfriendlistfacebook){
System.out.println("pass");
}else{
System.out.println("fail");
}

}

}