Swapped arguments (expected vs tested).

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@1520623 13f79535-47bb-0310-9956-ffa450edef68

src/test/java/org/apache/commons/math3/util/MathArraysTest.java

@@ -994,6 +994,6 @@ public class MathArraysTest {
     @Test
     public void testNaturalZero() {
         final int[] natural = MathArrays.natural(0);
-        Assert.assertEquals(natural.length, 0);
+        Assert.assertEquals(0, natural.length);
     }
 }