fix sparse squared norm
diff --git a/test/sparse_vector.cpp b/test/sparse_vector.cpp
index 5c6dadc..a510139 100644
--- a/test/sparse_vector.cpp
+++ b/test/sparse_vector.cpp
@@ -79,13 +79,15 @@
 
   VERIFY_IS_APPROX(v1*=s1, refV1*=s1);
   VERIFY_IS_APPROX(v1/=s1, refV1/=s1);
-  
+
   VERIFY_IS_APPROX(v1+=v2, refV1+=refV2);
   VERIFY_IS_APPROX(v1-=v2, refV1-=refV2);
 
   VERIFY_IS_APPROX(v1.dot(v2), refV1.dot(refV2));
   VERIFY_IS_APPROX(v1.dot(refV2), refV1.dot(refV2));
 
+  VERIFY_IS_APPROX(v1.squaredNorm(), refV1.squaredNorm());
+
 }
 
 void test_sparse_vector()