Fix problems detected by the latest version of errorprone

Change-Id: I532d3627fa232e93ee6860bd10db64c99e78f915
diff --git a/utils/misc/src/test/java/org/onlab/graph/DisjointPathPairTest.java b/utils/misc/src/test/java/org/onlab/graph/DisjointPathPairTest.java
index 620fe40..7ab78c1 100644
--- a/utils/misc/src/test/java/org/onlab/graph/DisjointPathPairTest.java
+++ b/utils/misc/src/test/java/org/onlab/graph/DisjointPathPairTest.java
@@ -53,7 +53,8 @@
     public void testSwappingPrimarySecondaryDoesntImpactEquality() {
         new EqualsTester()
             .addEqualityGroup(new DisjointPathPair<>(ABC, ADC),
-                              new DisjointPathPair<>(ADC, ABC));
+                              new DisjointPathPair<>(ADC, ABC))
+            .testEquals();
     }
 
 }