add check for smearing_method (#5718)

Author: Qianruipku

source/module_io/read_input_item_elec_stru.cpp

@@ -330,6 +330,18 @@ void ReadInput::item_elec_stru()
         Input_Item item("smearing_method");
         item.annotation = "type of smearing_method: gauss; fd; fixed; mp; mp2; mv";
         read_sync_string(input.smearing_method);
+        item.check_value = [](const Input_Item& item, const Parameter& para) {
+            const std::vector<std::string> methods = {"gauss", "gaussian", 
+                                                      "fd", "fermi-dirac",
+                                                      "fixed",
+                                                      "mp", "mp2", "mp3"
+                                                      "marzari-vanderbilt", "cold", "mv"};
+            if (std::find(methods.begin(), methods.end(), para.input.smearing_method) == methods.end())
+            {
+                const std::string warningstr = nofound_str(methods, "smearing_method");
+                ModuleBase::WARNING_QUIT("ReadInput", warningstr);
+            }
+        };
         this->add_item(item);
     }
     {

source/module_io/test_serial/read_input_item_test.cpp

@@ -99,6 +99,14 @@ TEST_F(InputTest, Item_test)
         output = testing::internal::GetCapturedStdout();
         EXPECT_THAT(output, testing::HasSubstr("NOTICE"));
     }
+    { // smearing_method
+        auto it = find_label("smearing_method", readinput.input_lists);
+        param.input.smearing_method = "fix";
+        testing::internal::CaptureStdout();
+        EXPECT_EXIT(it->second.check_value(it->second, param), ::testing::ExitedWithCode(1), "");
+        output = testing::internal::GetCapturedStdout();
+        EXPECT_THAT(output, testing::HasSubstr("NOTICE"));
+    }
     { // kspacing
         auto it = find_label("kspacing", readinput.input_lists);
         it->second.str_values = {"1"};