add ReverseInnerIterators to loop over the elements in reverse order,
and partly fix bug #356 (issue in trisolve for upper-column major))
diff --git a/test/sparse_basic.cpp b/test/sparse_basic.cpp
index c566bd9..a3a6086 100644
--- a/test/sparse_basic.cpp
+++ b/test/sparse_basic.cpp
@@ -198,6 +198,9 @@
 
     VERIFY_IS_APPROX(m1.col(0).dot(refM2.row(0)), refM1.col(0).dot(refM2.row(0)));
 
+    VERIFY_IS_APPROX(m1.conjugate(), refM1.conjugate());
+    VERIFY_IS_APPROX(m1.real(), refM1.real());
+
     refM4.setRandom();
     // sparse cwise* dense
     VERIFY_IS_APPROX(m3.cwiseProduct(refM4), refM3.cwiseProduct(refM4));