Please help me with this problem. Thank you

Testing Your MergeSorter:

I have given you a very limited set of JUnit tests to help determine if your implementation is correct. You need to add at least 5 more JUnit tests for the mergeSort method that test typical and edge cases. You are welcome to create more than five JUnit tests, but as long as you create and pass five JUnit tests.

package divideandconquer;

import static org.junit.Assert.*;

import org.junit.Before; import org.junit.BeforeClass; import org.junit.Test;

public class MergeSorterTest {

@BeforeClass public static void setUpBeforeClass() throws Exception { }

@Before public void setUp() throws Exception { }

@Test public void test() { int[] nums = new int[]{4,3,2,1}; int[] sorted = new int[] {1,2,3,4}; MergeSorter.mergeSort(nums); assertArrayEquals(sorted,nums); }

}