finished part 5

src/test/java/Swap/SwapTest.java

 public class SwapTest {
     @Test
     public void testSwap() throws Exception {
-        Double[] result = Swap.swap(0,1, 1.5, 2,3);
+        Double[] result = Swap.swap(0,1, 1.5, 2.0, 3.0);
         Double[] expected = {2.0, 1.5, 3.0};
         Assert.assertArrayEquals(expected, result);
     }