How to run a simple JUnit4 test in Android Studio 1.1?

I have an Android project that shows "Hello World". It was created from the "Blank Activity" template from Android Studio.

I then add/create a new java class in my application package (the same package that has my activity). I call it Shape and add a simple constructor

public class Shape {
    public Shape(int i){
        if (i==0){
            throw new IllegalArgumentException("Cant have 0");
        }
    }
}

Great. Now I have a class that isn't touching Android at all, and I want to unit test it. What should I do next?

This is where my question stops. Below I'll go through what I tried.

Please note that I really have never tested before in Android or Java. Excuse me for "rookie" mistakes.

1. While in the Shape.java I go to "Navigate" > "Test"


2. Hit enter to select "Create new Test"


3. Get this popup, and select JUNIT4.


4. I then hit the fix button to fix the library not being found


5. I get this popup


6. I'm not really sure what to select, so I select the default/highlighted.


7. 
   

   I write my test

   
   

   package com.eghdk.getjunit4towork;

   
   

   import org.junit.Test;

   
   

   import static org.junit.Assert.*;

   
   

   public class ShapeTest { @Test(expected = IllegalArgumentException.class) public void testShapeWithInvalidArg() { new Shape(0); } }

   
   


8. 
   

   At this point, I'm not really sure how to run my tests, but try to do this:

   
   


9. 
   

   I get these errors when running

   
   

   Error:(3, 17) Gradle: error: package org.junit does not exist Error:(5, 24) Gradle: error: package org.junit does not exist Error:(8, 6) Gradle: error: cannot find symbol class Test