add const for Find_atom() in unittests

Author: YuLiu98

source/module_elecstate/module_dm/test/test_dm_io.cpp

@@ -48,7 +48,7 @@ void Grid_Driver::Find_atom(const UnitCell& ucell,
                             const ModuleBase::Vector3<double>& tau,
                             const int& T,
                             const int& I,
-                            AdjacentAtomInfo* adjs)
+                            AdjacentAtomInfo* adjs) const
 {
 }
 Grid::Grid(const int& test_grid_in) : test_grid(test_grid_in)

source/module_elecstate/module_dm/test/tmp_mocks.cpp

@@ -78,7 +78,7 @@ void Grid_Driver::Find_atom(const UnitCell& ucell,
                             const ModuleBase::Vector3<double>& tau,
                             const int& T,
                             const int& I,
-                            AdjacentAtomInfo* adjs)
+                            AdjacentAtomInfo* adjs) const
 {
     adjs->adj_num = ucell.nat - 1;
     adjs->adjacent_tau.resize(ucell.nat);

source/module_hamilt_lcao/hamilt_lcaodft/operator_lcao/test/tmp_mocks.cpp

@@ -156,7 +156,8 @@ void Grid_Driver::Find_atom(const UnitCell& ucell,
                             const ModuleBase::Vector3<double>& tau,
                             const int& T,
                             const int& I,
-                            AdjacentAtomInfo* adjs) {
+                            AdjacentAtomInfo* adjs) const
+{
     adjs->adj_num = ucell.nat - 1;
     adjs->adjacent_tau.resize(ucell.nat);
     adjs->ntype.resize(ucell.nat, 0);