// 
// FourthSumTest.java: test FourthSum.java using JUnit4
//
// Running on windows, assuming junit4 in c:\apps\junit:
//   javac -cp .;"c:/apps/java/*" *.java
//   java -cp .;"c:/apps/java/*" org.junit.runner.JUnitCore FourthSumTest FourthMainTest
// On Linux, after sudo apt-get install junit4:
//   javac -cp .:/usr/share/java/'*' FourthSumTest.java
//   java -cp .:/usr/share/java/'*' org.junit.runner.JUnitCore FourthSumTest FourthMainTest
//

import org.junit.Test;
import static org.junit.Assert.*;

public class FourthSumTest {

   @Test
   public void testSmallNumsTo4thPower() {
      assertEquals(1, FourthSum.fourthPower(1));
      assertEquals(16, FourthSum.fourthPower(2));
      assertEquals(81, FourthSum.fourthPower(3));
      assertEquals(6561, FourthSum.fourthPower(9));
   }
  
   @Test
   public void testNegative() {
      assertEquals(81, FourthSum.fourthPower(-3));
   }

   @Test
   public void testListOfSmallNums() {
      // note these values are in testSmallNumsTo4thPower
      assertEquals(1 + 6561 + 16 + 81,
                   FourthSum.sumOfFourthPowers(new int[]{1, 9, 2, 3}));
   }
      
   @Test
   public void testZeroes() {
      assertEquals(0, FourthSum.fourthPower(0));
      assertEquals(0, FourthSum.sumOfFourthPowers(new int[]{0, 0, 0}));
   }

}