Added a test.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@1165296 13f79535-47bb-0310-9956-ffa450edef68

src/test/java/org/apache/commons/math/complex/ComplexTest.java

@@ -315,6 +315,12 @@ public class ComplexTest {
         Assert.assertSame(Complex.NaN, z);
     }
 
+    @Test
+    public void testMultiplyInInf() {
+        // Assert.assertTrue(infInf.multiply(infInf).isNaN()); // MATH-620
+        Assert.assertTrue(infInf.multiply(infInf).isInfinite());
+    }
+
     @Test
     public void testMultiplyNaNInf() {
         Complex z = new Complex(1,1);