Test for the sparse Blue norm
diff --git a/test/sparse_vector.cpp b/test/sparse_vector.cpp
index 9d559f5..7973a47 100644
--- a/test/sparse_vector.cpp
+++ b/test/sparse_vector.cpp
@@ -77,6 +77,8 @@
 
 
   VERIFY_IS_APPROX(v1.squaredNorm(), refV1.squaredNorm());
+  
+  VERIFY_IS_APPROX(v1.blueNorm(), refV1.blueNorm());
 
   // test aliasing
   VERIFY_IS_APPROX((v1 = -v1), (refV1 = -refV1));