Fix some conversion warnings in unit tests.

diff --git a/test/geo_quaternion.cpp b/test/geo_quaternion.cpp
index f9e45f0..96889e7 100644
--- a/test/geo_quaternion.cpp
+++ b/test/geo_quaternion.cpp

@@ -31,7 +31,7 @@
 
   Scalar theta_tot = AA(q1*q0.inverse()).angle();
   if(theta_tot>Scalar(EIGEN_PI))
-    theta_tot = Scalar(2.*EIGEN_PI)-theta_tot;
+    theta_tot = Scalar(2.)*Scalar(EIGEN_PI)-theta_tot;
   for(Scalar t=0; t<=Scalar(1.001); t+=Scalar(0.1))
   {
     QuatType q = q0.slerp(t,q1);

diff --git a/test/sparse_block.cpp b/test/sparse_block.cpp
index 582bf34..49a5f13 100644
--- a/test/sparse_block.cpp
+++ b/test/sparse_block.cpp

@@ -17,6 +17,7 @@
   const Index outer = ref.outerSize();
 
   typedef typename SparseMatrixType::Scalar Scalar;
+  typedef typename SparseMatrixType::StorageIndex StorageIndex;
 
   double density = (std::max)(8./(rows*cols), 0.01);
   typedef Matrix<Scalar,Dynamic,Dynamic> DenseMatrix;
@@ -123,7 +124,7 @@
     m3.reserve(VectorXi::Constant(outer,int(inner/2)));
     for(Index j=0; j<outer; ++j)
       for(Index k=0; k<(std::min)(j,inner); ++k)
-        m3.insertByOuterInner(j,k) = k+1;
+        m3.insertByOuterInner(j,k) = internal::convert_index<StorageIndex>(k+1);
     for(Index j=0; j<(std::min)(outer, inner); ++j)
     {
       VERIFY(j==numext::real(m3.innerVector(j).nonZeros()));

diff --git a/test/vectorwiseop.cpp b/test/vectorwiseop.cpp
index 3cc1987..739eaca 100644
--- a/test/vectorwiseop.cpp
+++ b/test/vectorwiseop.cpp

@@ -233,10 +233,10 @@
   Matrix<Scalar,1,MatrixType::RowsAtCompileTime> tmp(rows);
   VERIFY_EVALUATION_COUNT( tmp = (m1 * m1.transpose()).colwise().sum(), (MatrixType::RowsAtCompileTime==Dynamic ? 1 : 0));
 
-  m2 = m1.rowwise() - (m1.colwise().sum()/m1.rows()).eval();
-  m1 = m1.rowwise() - (m1.colwise().sum()/m1.rows());
+  m2 = m1.rowwise() - (m1.colwise().sum()/RealScalar(m1.rows())).eval();
+  m1 = m1.rowwise() - (m1.colwise().sum()/RealScalar(m1.rows()));
   VERIFY_IS_APPROX( m1, m2 );
-  VERIFY_EVALUATION_COUNT( m2 = (m1.rowwise() - m1.colwise().sum()/m1.rows()), (MatrixType::RowsAtCompileTime==Dynamic && MatrixType::ColsAtCompileTime!=1 ? 1 : 0) );
+  VERIFY_EVALUATION_COUNT( m2 = (m1.rowwise() - m1.colwise().sum()/RealScalar(m1.rows())), (MatrixType::RowsAtCompileTime==Dynamic && MatrixType::ColsAtCompileTime!=1 ? 1 : 0) );
 }
 
 void test_vectorwiseop()