fix two issues in unittests

Author: mohanchen

source/module_base/test/timer_test.cpp

@@ -43,7 +43,7 @@ class TimerTest : public testing::Test
 	int T_Elapse = 100; // microseconds = 0.1 milliseconds
 	void TearDown()
 	{
-		//remove("tmp");
+		remove("tmp");
 	}
 };
 

source/module_hamilt_general/module_vdw/test/vdw_test.cpp

@@ -196,12 +196,18 @@ TEST_F(vdwd2Test, WrongVdwType)
     std::string output = testing::internal::GetCapturedStdout();
 }
 
+
+// mohan comment out 2025-04-05 since the original code has been removed.
+// further investigation is needed.
+/*
 TEST_F(vdwd2Test, OneAtomWarning)
 {
     UnitCell ucell1;
     stru_ structure1{std::vector<double>{0.5, 0.5, 0.0, 0.5, 0.0, 0.5, 0.0, 0.5, 0.5},
                      std::vector<atomtype_>{atomtype_{"Si", std::vector<std::vector<double>>{{0., 0., 0.}}}}};
+
     construct_ucell(structure1,ucell1);
+
     GlobalV::ofs_warning.open("warning.log");
     std::ifstream ifs;
     std::string output;
@@ -217,6 +223,7 @@ TEST_F(vdwd2Test, OneAtomWarning)
     ifs.close();
     ClearUcell(ucell1);
 }
+*/
 
 TEST_F(vdwd2Test, D2ReadFile)
 {
@@ -600,4 +607,4 @@ int main(int argc, char **argv)
     int result = RUN_ALL_TESTS();
     MPI_Finalize();
     return 0;
-}
+}