Fix problems detected by the latest version of errorprone

Change-Id: I532d3627fa232e93ee6860bd10db64c99e78f915
diff --git a/core/api/src/test/java/org/onosproject/net/resource/DiscreteResourceIdTest.java b/core/api/src/test/java/org/onosproject/net/resource/DiscreteResourceIdTest.java
index 3dc4275..0bd833f 100644
--- a/core/api/src/test/java/org/onosproject/net/resource/DiscreteResourceIdTest.java
+++ b/core/api/src/test/java/org/onosproject/net/resource/DiscreteResourceIdTest.java
@@ -42,9 +42,11 @@
 
         new EqualsTester()
                 .addEqualityGroup(id1, sameAsId1)
-                .addEqualityGroup(id2);
+                .addEqualityGroup(id2)
+                .testEquals();
     }
 
+
     @Test
     public void testSimpleTypeName() {
         DiscreteResourceId id = Resources.discrete(D1, P1, VLAN1).id();