fix compilation of sparse tests

test/sparse.h

diff --git a/test/sparse.h b/test/sparse.h
index 246dc1f..4733e4d 100644
--- a/test/sparse.h
+++ b/test/sparse.h
@@ -41,7 +41,6 @@
 #include <Eigen/Cholesky>
 #include <Eigen/LU>
 #include <Eigen/Sparse>
-#include <Eigen/SparseExtra>
 
 enum {
   ForceNonZeroDiag = 1,

unsupported/test/sparse_ldlt.cpp

diff --git a/unsupported/test/sparse_ldlt.cpp b/unsupported/test/sparse_ldlt.cpp
index 8671807..618a22b 100644
--- a/unsupported/test/sparse_ldlt.cpp
+++ b/unsupported/test/sparse_ldlt.cpp
@@ -23,6 +23,7 @@
 // Eigen. If not, see <http://www.gnu.org/licenses/>.
 
 #include "sparse.h"
+#include <Eigen/SparseExtra>
 
 #ifdef EIGEN_TAUCS_SUPPORT
 #include <Eigen/TaucsSupport>

unsupported/test/sparse_llt.cpp

diff --git a/unsupported/test/sparse_llt.cpp b/unsupported/test/sparse_llt.cpp
index 97360f1..0c7340c 100644
--- a/unsupported/test/sparse_llt.cpp
+++ b/unsupported/test/sparse_llt.cpp
@@ -23,6 +23,7 @@
 // Eigen. If not, see <http://www.gnu.org/licenses/>.
 
 #include "sparse.h"
+#include <Eigen/SparseExtra>
 
 #ifdef EIGEN_CHOLMOD_SUPPORT
 #include <Eigen/CholmodSupport>

unsupported/test/sparse_lu.cpp

diff --git a/unsupported/test/sparse_lu.cpp b/unsupported/test/sparse_lu.cpp
index bdf79ca..75aa7a9 100644
--- a/unsupported/test/sparse_lu.cpp
+++ b/unsupported/test/sparse_lu.cpp
@@ -23,6 +23,7 @@
 // Eigen. If not, see <http://www.gnu.org/licenses/>.
 
 #include "sparse.h"
+#include <Eigen/SparseExtra>
 
 #ifdef EIGEN_UMFPACK_SUPPORT
 #include <Eigen/UmfPackSupport>