improve testmethod name to clarify goal

wls-basisdaten-service/src/test/java/de/muenchen/oss/wahllokalsystem/basisdatenservice/rest/referendumvorlagen/ReferendumvorlagenControllerIntegrationTest.java

@@ -105,7 +105,7 @@ void loadedFromExternal() throws Exception {
 
         @Test
         @Transactional
-        void returnExistingDataWithoutImport() throws Exception {
+        void should_persistData_when_importedViaClient() throws Exception {
             val wahlID = "wahlID";
             val wahlbezirkID = "wahlbezirkID";