[T] Initialize needed global vectors.

Tests/MathLib/TestGlobalVectorInterface.cpp

@@ -36,6 +36,7 @@ template <class T_VECTOR>
 void checkGlobalVectorInterface()
 {
     T_VECTOR x(10);
+    x.setZero();
 
     ASSERT_EQ(10u, x.size());
     ASSERT_EQ(0u, x.getRangeBegin());

Tests/MathLib/TestLinearSolver.cpp

@@ -117,7 +117,9 @@ void checkLinearSolverInterface(T_MATRIX &A, BaseLib::ConfigTree const& ls_optio
 
     // set RHS and solution vectors
     T_VECTOR rhs(ex1.dim_eqs);
+    rhs.setZero();
     T_VECTOR x(ex1.dim_eqs);
+    x.setZero();
 
     // apply BC
     MathLib::applyKnownSolution(A, rhs, x, ex1.vec_dirichlet_bc_id, ex1.vec_dirichlet_bc_value);

Tests/NumLib/TestSerialLinearSolver.cpp

@@ -69,8 +69,9 @@ TEST(NumLibSerialLinearSolver, Steady2DdiffusionQuadElem)
     auto A = MathLib::MatrixVectorTraits<GlobalMatrix>::newInstance(ms);
     A->setZero();
     auto rhs = MathLib::MatrixVectorTraits<GlobalVector>::newInstance(ms);
+    rhs->setZero();
     auto x = MathLib::MatrixVectorTraits<GlobalVector>::newInstance(ms);
-    // TODO no setZero() for rhs, x?
+    x->setZero();
 
     using LocalAssembler = Example::LocalAssemblerData;
     // Initializer of the local assembler data.