test(service): add integration test for findOrCreateByAlias classification

Testcontainers test verifying: SKIP returns null with no DB record,
INSTITUTION/GROUP store full name in lastName with null firstName
and correct personType, PERSON splits name normally.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/src/test/java/org/raddatz/familienarchiv/service/PersonServiceIntegrationTest.java

@@ -0,0 +1,66 @@
+package org.raddatz.familienarchiv.service;
+
+import org.junit.jupiter.api.Test;
+import org.raddatz.familienarchiv.PostgresContainerConfig;
+import org.raddatz.familienarchiv.model.Person;
+import org.raddatz.familienarchiv.model.PersonType;
+import org.raddatz.familienarchiv.repository.PersonRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.context.annotation.Import;
+import org.springframework.test.annotation.DirtiesContext;
+import org.springframework.test.context.ActiveProfiles;
+import org.springframework.test.context.bean.override.mockito.MockitoBean;
+import software.amazon.awssdk.services.s3.S3Client;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.NONE)
+@ActiveProfiles("test")
+@Import(PostgresContainerConfig.class)
+@DirtiesContext(classMode = DirtiesContext.ClassMode.AFTER_EACH_TEST_METHOD)
+class PersonServiceIntegrationTest {
+
+    @MockitoBean S3Client s3Client;
+    @Autowired PersonService personService;
+    @Autowired PersonRepository personRepository;
+
+    @Test
+    void findOrCreateByAlias_skipReturnsNull_noRecordCreated() {
+        Person result = personService.findOrCreateByAlias("Briefumschlag aus Java");
+
+        assertThat(result).isNull();
+        assertThat(personRepository.findAll()).isEmpty();
+    }
+
+    @Test
+    void findOrCreateByAlias_institutionStoresFullNameInLastName() {
+        Person result = personService.findOrCreateByAlias("Arthur Collignon GmbH");
+
+        assertThat(result).isNotNull();
+        assertThat(result.getPersonType()).isEqualTo(PersonType.INSTITUTION);
+        assertThat(result.getFirstName()).isNull();
+        assertThat(result.getLastName()).isEqualTo("Arthur Collignon GmbH");
+        assertThat(result.getDisplayName()).isEqualTo("Arthur Collignon GmbH");
+    }
+
+    @Test
+    void findOrCreateByAlias_groupStoresFullNameInLastName() {
+        Person result = personService.findOrCreateByAlias("Geschwister de Gruyter");
+
+        assertThat(result).isNotNull();
+        assertThat(result.getPersonType()).isEqualTo(PersonType.GROUP);
+        assertThat(result.getFirstName()).isNull();
+        assertThat(result.getLastName()).isEqualTo("Geschwister de Gruyter");
+    }
+
+    @Test
+    void findOrCreateByAlias_personSplitsNameNormally() {
+        Person result = personService.findOrCreateByAlias("Clara Cram");
+
+        assertThat(result).isNotNull();
+        assertThat(result.getPersonType()).isEqualTo(PersonType.PERSON);
+        assertThat(result.getFirstName()).isEqualTo("Clara");
+        assertThat(result.getLastName()).isEqualTo("Cram");
+    }
+}