diff --git a/src/test/java/de/ozgcloud/admin/migration/M001_CreateEmptyPostfachIfMissingITCase.java b/src/test/java/de/ozgcloud/admin/migration/M001_CreateEmptyPostfachIfMissingITCase.java
index 69277ba8d18e7185770a3df920f2cb8f2196de9f..161040dc0b92b777dd4a3af99b6efd6bb6d6a68b 100644
--- a/src/test/java/de/ozgcloud/admin/migration/M001_CreateEmptyPostfachIfMissingITCase.java
+++ b/src/test/java/de/ozgcloud/admin/migration/M001_CreateEmptyPostfachIfMissingITCase.java
@@ -8,24 +8,21 @@ import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.data.mongodb.core.MongoTemplate;
-import org.springframework.data.mongodb.core.query.Query;
 
 import java.util.List;
-import java.util.Set;
 
+import static de.ozgcloud.admin.migration.M001_CreateEmptyPostfachIfMissing.SETTINGS_COLLECTION;
 import static org.assertj.core.api.AssertionsForInterfaceTypes.assertThat;
 
 @DataITCase
-public class M001_CreateEmptyPostfachIfMissingITCase {
+class M001_CreateEmptyPostfachIfMissingITCase {
 	private final M001_CreateEmptyPostfachIfMissing changeUnit = new M001_CreateEmptyPostfachIfMissing();
 
-	private static final Document POSTFACH = MigrationTestFactory.createPostfach();
+	private static final Document POSTFACH = MigrationTestFactory.createDummyPostfach();
 
 	@Autowired
 	private MongoTemplate template;
 
-	public static final String SETTINGS_COLLECTION = "settings";
-
 	@DisplayName("Do migration")
 	@Nested
 	class TestDoMigration {
@@ -35,10 +32,10 @@ public class M001_CreateEmptyPostfachIfMissingITCase {
 		}
 
 		@Test
-		void shouldAddPostfachIfMissing() {
+		void shouldAddPostfachIfEmpty() {
 			changeUnit.doMigration(template);
 
-			List<Document> settings = template.find(new Query(), Document.class, SETTINGS_COLLECTION);
+			List<Document> settings = template.findAll(Document.class, SETTINGS_COLLECTION);
 			assertThat(settings).hasSize(1)
 					.anyMatch(this::isEmptyPostfachSetting
 					);
@@ -51,81 +48,39 @@ public class M001_CreateEmptyPostfachIfMissingITCase {
 
 			changeUnit.doMigration(template);
 
-			// assert leeres Postfach sollte angelegt sein
-			List<Document> settings = template.find(new Query(), Document.class, SETTINGS_COLLECTION);
+			List<Document> settings = template.findAll(Document.class, SETTINGS_COLLECTION);
 			assertThat(settings).hasSize(2)
-					.anyMatch(s ->
-						s.get(MigrationTestFactory.ITEM_TYPE_KEY).equals("SomeType")
-					)
-					.anyMatch(this::isEmptyPostfachSetting
-					);
+					.anyMatch(this::isEmptyPostfachSetting);
 		}
 
 		@Test
-		void shouldKeepExistingPostfach() {
-			// Postfach in settings Collection anlegen
-			template.save(POSTFACH, SETTINGS_COLLECTION);
+		void shouldKeepExistingSetting() {
+			var settingItem = MigrationTestFactory.createSettingsItem("SomeType", new Document());
+			template.save(settingItem, SETTINGS_COLLECTION);
 
 			changeUnit.doMigration(template);
 
-			// assert Postfach in settings Collection sollte unverändert sein
-			List<Document> settings = template.find(new Query(), Document.class, SETTINGS_COLLECTION);
-			assertThat(settings).hasSize(1)
-					.contains(POSTFACH);
+			List<Document> settings = template.findAll(Document.class, SETTINGS_COLLECTION);
+			assertThat(settings).anyMatch(s ->
+							s.get(MigrationTestFactory.ITEM_TYPE_KEY).equals("SomeType")
+					);
 		}
 
-		private boolean isEmptyPostfachSetting(Document document) {
-			Set<String> expectedKeySet = Set.of(
-					MigrationTestFactory.ITEM_TYPE_KEY,
-					MigrationTestFactory.ITEM_SETTINGS_KEY
-			);
-			if(document.keySet().containsAll(expectedKeySet) &&
-					document.get(MigrationTestFactory.ITEM_TYPE_KEY).equals(MigrationTestFactory.ITEM_TYPE_VALUE_POSTFACH)) {
-				var settingsValue = document.get(MigrationTestFactory.ITEM_SETTINGS_KEY);
-				if (settingsValue instanceof Document postfach) {
-					return isEmptyPostfach(postfach);
-				}
-			}
-			return false;
-		}
+		@Test
+		void shouldKeepExistingPostfach() {
+			template.save(POSTFACH, SETTINGS_COLLECTION);
 
-		private boolean isEmptyPostfach(Document document) {
-			Set<String> expectedKeySet = Set.of(
-					MigrationTestFactory.POSTFACH_ABSENDER_KEY,
-					MigrationTestFactory.POSTFACH_SIGNATUR_KEY
-			);
-			if (document.keySet().containsAll(expectedKeySet) &&
-					document.keySet().size() == expectedKeySet.size()) {
-				var absenderValue = document.get(MigrationTestFactory.POSTFACH_ABSENDER_KEY);
-				var signaturValue = document.get(MigrationTestFactory.POSTFACH_SIGNATUR_KEY);
-				if (absenderValue instanceof Document absender &&
-						signaturValue instanceof Document signatur) {
-					return isEmptyAbsender(absender) && isEmptySignatur(signatur);
-				}
-			}
-			return false;
-		}
+			changeUnit.doMigration(template);
 
-		private boolean isEmptyAbsender(Document document) {
-			Set<String> expectedKeySet = Set.of(
-					MigrationTestFactory.ABSENDER_ANSCHRIFT_KEY,
-					MigrationTestFactory.ABSENDER_NAME_KEY,
-					MigrationTestFactory.ABSENDER_DIENST_KEY,
-					MigrationTestFactory.ABSENDER_MANDANT_KEY,
-					MigrationTestFactory.ABSENDER_GEMEINDESCHLUESSEL_KEY
-			);
-			return document.keySet().containsAll(expectedKeySet) &&
-					document.keySet().size() == expectedKeySet.size() &&
-					document.entrySet().stream().allMatch(entry -> entry.getValue().equals(""));
+			List<Document> settings = template.findAll(Document.class, SETTINGS_COLLECTION);
+			assertThat(settings).containsExactly(POSTFACH);
 		}
 
-		private boolean isEmptySignatur(Document document) {
-			Set<String> expectedKeySet = Set.of(
-					MigrationTestFactory.SIGNATUR_TEXT_KEY
-			);
-			return document.keySet().containsAll(expectedKeySet) &&
-					document.keySet().size() == expectedKeySet.size() &&
-					document.entrySet().stream().allMatch(entry -> entry.getValue().equals(""));
+		private boolean isEmptyPostfachSetting(Document document) {
+			return document.containsKey(MigrationTestFactory.ITEM_TYPE_KEY) &&
+					document.get(MigrationTestFactory.ITEM_TYPE_KEY)
+							.equals(MigrationTestFactory.ITEM_TYPE_VALUE_POSTFACH) &&
+					!document.containsKey(MigrationTestFactory.ITEM_SETTINGS_KEY);
 		}
 
 	}
diff --git a/src/test/java/de/ozgcloud/admin/migration/MigrationTestFactory.java b/src/test/java/de/ozgcloud/admin/migration/MigrationTestFactory.java
index 35fa0e187870364cfa79c5ca8aea18a00bebf4f1..16af051b5712a8dcb667f9aa8604646688368f5e 100644
--- a/src/test/java/de/ozgcloud/admin/migration/MigrationTestFactory.java
+++ b/src/test/java/de/ozgcloud/admin/migration/MigrationTestFactory.java
@@ -4,8 +4,6 @@ import com.thedeanda.lorem.Lorem;
 import com.thedeanda.lorem.LoremIpsum;
 import org.bson.Document;
 
-import java.util.Random;
-
 public class MigrationTestFactory {
 
 	private static final Lorem lorem = LoremIpsum.getInstance();
@@ -23,24 +21,18 @@ public class MigrationTestFactory {
 
 	public static final String ITEM_TYPE_VALUE_POSTFACH = "Postfach";
 	public static final String POSTFACH_ABSENDER_KEY = "absender";
-	public static final String POSTFACH_SIGNATUR_KEY = "signatur";
 	public static final String ABSENDER_NAME_KEY = "name";
 	public static final String ABSENDER_NAME_VALUE = lorem.getName();
 	public static final String ABSENDER_ANSCHRIFT_KEY = "anschrift";
-	public static final String ABSENDER_ANSCHRIFT_VALUE = lorem.getWords(1) + ", " + lorem.getZipCode() + " " + lorem.getCity();
-	public static final String ABSENDER_DIENST_KEY = "dienst";
-	public static final String ABSENDER_DIENST_VALUE = lorem.getWords(1, 2);
-	public static final String ABSENDER_MANDANT_KEY = "mandant";
-	public static final String ABSENDER_MANDANT_VALUE = lorem.getWords(2, 3);
-	public static final String ABSENDER_GEMEINDESCHLUESSEL_KEY = "gemeindeschluessel";
-	public static final String ABSENDER_GEMEINDESCHLUESSEL_VALUE = String.valueOf(new Random().nextInt(1000000));
-	public static final String SIGNATUR_TEXT_KEY = "text";
-	public static final String SIGNATUR_TEXT_VALUE = lorem.getParagraphs(1, 3);
-
-	public static Document createPostfach() {
+	public static final String ABSENDER_ANSCHRIFT_VALUE = lorem.getZipCode() + " " + lorem.getCity();
+
+	/**
+	 * Erzeugt ein aus fachlicher Sicht unvollständiges Postfach.
+	 * @return Ein Postfach Document
+	 */
+	public static Document createDummyPostfach() {
 		var postfach = new Document();
 		postfach.put(POSTFACH_ABSENDER_KEY, createAbsender());
-		postfach.put(POSTFACH_SIGNATUR_KEY, createSignatur());
 		return createSettingsItem(ITEM_TYPE_VALUE_POSTFACH, postfach);
 	}
 
@@ -48,15 +40,7 @@ public class MigrationTestFactory {
 		var absender = new Document();
 		absender.put(ABSENDER_NAME_KEY, ABSENDER_NAME_VALUE);
 		absender.put(ABSENDER_ANSCHRIFT_KEY, ABSENDER_ANSCHRIFT_VALUE);
-		absender.put(ABSENDER_DIENST_KEY, ABSENDER_DIENST_VALUE);
-		absender.put(ABSENDER_MANDANT_KEY, ABSENDER_MANDANT_VALUE);
-		absender.put(ABSENDER_GEMEINDESCHLUESSEL_KEY, ABSENDER_GEMEINDESCHLUESSEL_VALUE);
 		return absender;
 	}
 
-	private static Document createSignatur() {
-		var signatur = new Document();
-		signatur.put(SIGNATUR_TEXT_KEY, SIGNATUR_TEXT_VALUE);
-		return signatur;
-	}
 }