Lint and other cleanups from William Rucklidge

Change-Id: I7fb23c2db85f0f121204560b79f1966f3d584431
diff --git a/internal/ceres/single_linkage_clustering_test.cc b/internal/ceres/single_linkage_clustering_test.cc
index 8fbf84b..42cbda3 100644
--- a/internal/ceres/single_linkage_clustering_test.cc
+++ b/internal/ceres/single_linkage_clustering_test.cc
@@ -61,6 +61,8 @@
   EXPECT_EQ(membership[1], membership[0]);
   EXPECT_EQ(membership[2], membership[0]);
   EXPECT_EQ(membership[3], membership[0]);
+  EXPECT_NE(membership[4], membership[0]);
+  EXPECT_NE(membership[5], membership[0]);
   EXPECT_EQ(membership[4], membership[5]);
 }
 
@@ -88,6 +90,8 @@
   EXPECT_EQ(membership[1], membership[0]);
   EXPECT_EQ(membership[2], membership[0]);
   EXPECT_EQ(membership[3], membership[0]);
+  EXPECT_NE(membership[4], membership[0]);
+  EXPECT_NE(membership[5], membership[0]);
   EXPECT_NE(membership[4], membership[5]);
 }