Merge branch 'master' into feature/add-jenkinsfile

# Conflicts:
#	src/main/java/net/hostsharing/hsadminng/hs/office/relation/HsOfficeRelationController.java
#	src/test/java/net/hostsharing/hsadminng/hs/office/relation/HsOfficeRelationControllerAcceptanceTest.java

.aliases

@@ -83,7 +83,7 @@ alias fp='grep -r '@Accepts' src | sed -e 's/^.*@/@/g' | sort -u | wc -l'
 
 alias gw-spotless='./gradlew spotlessApply -x pitest -x test -x :processResources'
 alias gw-test='. .aliases; ./gradlew test'
-alias gw-check='. .aliases; gw test importOfficeData check -x pitest -x :dependencyCheckAnalyze'
+alias gw-check='. .aliases; gw test check -x pitest'
 
 # etc/docker-compose.yml limits CPUs+MEM and includes a PostgreSQL config for analysing slow queries
 alias gw-importOfficeData-in-docker-compose='

bin/git-pull-and-if-origin-changed-run-tests

@@ -1,36 +1,38 @@
 #!/bin/bash
+# waits for commits on any branch on origin, checks it out and builds it
 
-# get the current branch name
-BRANCH=$(git rev-parse --abbrev-ref HEAD)
+. .aliases
 
 while true; do
+    git fetch origin >/dev/null
+    branch_with_new_commits=`git fetch origin >/dev/null; git for-each-ref --format='%(refname:short) %(upstream:track)' refs/heads | grep '\[behind' | cut -d' ' -f1 | head -n1`
 
-  # get the latest commit hashes from origin and local
-  git fetch origin
-  LOCAL=$(git rev-parse HEAD)
-  REMOTE=$(git rev-parse origin/$BRANCH)
+    if [ -n "$branch_with_new_commits" ]; then
+          echo "checking out branch: $branch_with_new_commits"
+          if git show-ref --quiet --heads "$branch_with_new_commits"; then
+              echo "Branch $branch_with_new_commits already exists. Checking it out and pulling latest changes."
+              git checkout "$branch_with_new_commits"
+              git pull origin "$branch_with_new_commits"
+          else
+              echo "Creating and checking out new branch: $branch_with_new_commits"
+              git checkout -b "$branch_with_new_commits" "origin/$branch_with_new_commits"
+          fi
 
-  # check if the local branch differs from the remote branch
-  if [ "$LOCAL" != "$REMOTE" ]; then
-    echo "local $LOCAL differs from remote $REMOTE => pulling changes from origin"
-    git pull origin $BRANCH
+          echo "building ..."
+          ./gradlew gw clean test check -x pitest
+    fi
 
-    # run the command
-    echo "Running ./gradlew test"
-    source .aliases # only variables, aliases are not expanded in scripts
-    ./gradlew test
-  fi
-
-  # wait 10s with a little animation
-  echo -e -n " waiting for changes (/) ..."
-  sleep 2
-  echo -e -n "\r\033[K waiting for changes (-) ..."
-  sleep 2
-  echo -e -n "\r\033[K waiting for changes (\) ..."
-  sleep 2
-  echo -e -n "\r\033[K waiting for changes (|) ..."
-  sleep 2
-  echo -e -n "\r\033[K waiting for changes ( ) ... "
-  sleep 2
-  echo -e -n "\r\033[K"
+    # wait 10s with a little animation
+    echo -e -n "\r\033[K waiting for changes (/) ..."
+    sleep 2
+    echo -e -n "\r\033[K waiting for changes (-) ..."
+    sleep 2
+    echo -e -n "\r\033[K waiting for changes (\) ..."
+    sleep 2
+    echo -e -n "\r\033[K waiting for changes (|) ..."
+    sleep 2
+    echo -e -n "\r\033[K waiting for changes ( ) ... "
+    sleep 2
+    echo -e -n "\r\033[K checking for changes"
 done
+

build.gradle

@@ -277,7 +277,7 @@ jacocoTestCoverageVerification {
     violationRules {
         rule {
             limit {
-                minimum = 0.92
+                minimum = 0.80 // TODO.test: improve instruction coverage
             }
         }
 
@@ -289,15 +289,20 @@ jacocoTestCoverageVerification {
             element = 'CLASS'
             excludes = [
                     'net.hostsharing.hsadminng.**.generated.**',
+                    'net.hostsharing.hsadminng.rbac.test.dom.TestDomainEntity',
                     'net.hostsharing.hsadminng.HsadminNgApplication',
                     'net.hostsharing.hsadminng.ping.PingController',
+                    'net.hostsharing.hsadminng.rbac.generator.*',
+                    'net.hostsharing.hsadminng.rbac.grant.RbacGrantsDiagramService',
+                    'net.hostsharing.hsadminng.rbac.grant.RbacGrantsDiagramService.Node',
+                    'net.hostsharing.hsadminng.**.*Repository',
                     'net.hostsharing.hsadminng.mapper.Mapper'
             ]
 
             limit {
                 counter = 'LINE'
                 value = 'COVEREDRATIO'
-                minimum = 0.98
+                minimum = 0.75 // TODO.test: improve line coverage
             }
         }
         rule {
@@ -311,7 +316,7 @@ jacocoTestCoverageVerification {
             limit {
                 counter = 'BRANCH'
                 value = 'COVEREDRATIO'
-                minimum = 1.00
+                minimum = 0.00 // TODO.test: improve branch coverage
             }
         }
     }
@@ -344,14 +349,14 @@ pitest {
     targetClasses = ['net.hostsharing.hsadminng.**']
     excludedClasses = [
             'net.hostsharing.hsadminng.config.**',
-            'net.hostsharing.hsadminng.**.*Controller',
+            // 'net.hostsharing.hsadminng.**.*Controller',
             'net.hostsharing.hsadminng.**.generated.**'
     ]
 
     targetTests = ['net.hostsharing.hsadminng.**.*UnitTest', 'net.hostsharing.hsadminng.**.*RestTest']
     excludedTestClasses = ['**AcceptanceTest*', '**IntegrationTest*']
 
-    pitestVersion = '1.15.3'
+    pitestVersion = '1.17.0'
     junit5PluginVersion = '1.1.0'
 
     threads = 4

src/main/java/net/hostsharing/hsadminng/hs/booking/project/HsBookingProject.java

@@ -3,30 +3,14 @@ package net.hostsharing.hsadminng.hs.booking.project;
 import lombok.*;
 import lombok.experimental.SuperBuilder;
 import net.hostsharing.hsadminng.hs.booking.debitor.HsBookingDebitorEntity;
-import net.hostsharing.hsadminng.hs.office.debitor.HsOfficeDebitorEntity;
-import net.hostsharing.hsadminng.hs.office.relation.HsOfficeRelationRbacEntity;
-import net.hostsharing.hsadminng.rbac.generator.RbacView;
-import net.hostsharing.hsadminng.rbac.generator.RbacView.SQL;
 import net.hostsharing.hsadminng.persistence.BaseEntity;
 import net.hostsharing.hsadminng.stringify.Stringify;
 import net.hostsharing.hsadminng.stringify.Stringifyable;
 
 import jakarta.persistence.*;
-import java.io.IOException;
 import java.util.UUID;
 
 import static java.util.Optional.ofNullable;
-import static net.hostsharing.hsadminng.hs.office.relation.HsOfficeRelationType.DEBITOR;
-import static net.hostsharing.hsadminng.rbac.generator.RbacView.Column.dependsOnColumn;
-import static net.hostsharing.hsadminng.rbac.generator.RbacView.ColumnValue.usingCase;
-import static net.hostsharing.hsadminng.rbac.generator.RbacView.ColumnValue.usingDefaultCase;
-import static net.hostsharing.hsadminng.rbac.generator.RbacView.GLOBAL;
-import static net.hostsharing.hsadminng.rbac.generator.RbacView.Nullable.NOT_NULL;
-import static net.hostsharing.hsadminng.rbac.generator.RbacView.Permission.*;
-import static net.hostsharing.hsadminng.rbac.generator.RbacView.Role.*;
-import static net.hostsharing.hsadminng.rbac.generator.RbacView.SQL.directlyFetchedByDependsOnColumn;
-import static net.hostsharing.hsadminng.rbac.generator.RbacView.SQL.fetchedBySql;
-import static net.hostsharing.hsadminng.rbac.generator.RbacView.rbacViewFor;
 import static net.hostsharing.hsadminng.stringify.Stringify.stringify;
 
 @MappedSuperclass
@@ -66,50 +50,4 @@ public abstract class HsBookingProject implements Stringifyable, BaseEntity<HsBo
         return ofNullable(debitor).map(HsBookingDebitorEntity::toShortString).orElse("D-???????") +
                 ":" + caption;
     }
-
-    public static RbacView rbac() {
-        return rbacViewFor("project", HsBookingProjectRbacEntity.class)
-                .withIdentityView(SQL.query("""
-                        SELECT bookingProject.uuid as uuid, debitorIV.idName || '-' || base.cleanIdentifier(bookingProject.caption) as idName
-                            FROM hs_booking.project bookingProject
-                            JOIN hs_office.debitor_iv debitorIV ON debitorIV.uuid = bookingProject.debitorUuid
-                        """))
-                .withRestrictedViewOrderBy(SQL.expression("caption"))
-                .withUpdatableColumns("version", "caption")
-
-                .importEntityAlias("debitor", HsOfficeDebitorEntity.class, usingDefaultCase(),
-                        dependsOnColumn("debitorUuid"),
-                        directlyFetchedByDependsOnColumn(),
-                        NOT_NULL)
-
-                .importEntityAlias("debitorRel", HsOfficeRelationRbacEntity.class, usingCase(DEBITOR),
-                        dependsOnColumn("debitorUuid"),
-                        fetchedBySql("""
-                                SELECT ${columns}
-                                    FROM hs_office.relation debitorRel
-                                    JOIN hs_office.debitor debitor ON debitor.debitorRelUuid = debitorRel.uuid
-                                    WHERE debitor.uuid = ${REF}.debitorUuid
-                                """),
-                        NOT_NULL)
-                .toRole("debitorRel", ADMIN).grantPermission(INSERT)
-                .toRole(GLOBAL, ADMIN).grantPermission(DELETE)
-
-                .createRole(OWNER, (with) -> {
-                    with.incomingSuperRole("debitorRel", AGENT).unassumed();
-                })
-                .createSubRole(ADMIN, (with) -> {
-                    with.permission(UPDATE);
-                })
-                .createSubRole(AGENT)
-                .createSubRole(TENANT, (with) -> {
-                    with.outgoingSubRole("debitorRel", TENANT);
-                    with.permission(SELECT);
-                })
-
-                .limitDiagramTo("project", "debitorRel", "rbac.global");
-    }
-
-    public static void main(String[] args) throws IOException {
-        rbac().generateWithBaseFileName("6-hs-booking/620-booking-project/6203-hs-booking-project-rbac");
-    }
 }

src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/factories/DomainSetupHostingAssetFactory.java

@@ -10,12 +10,14 @@ import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType;
 import net.hostsharing.hsadminng.hs.office.contact.HsOfficeContactRealEntity;
 import net.hostsharing.hsadminng.lambda.Reducer;
 import net.hostsharing.hsadminng.mapper.StandardMapper;
+import net.hostsharing.hsadminng.mapper.ToStringConverter;
 import net.hostsharing.hsadminng.persistence.EntityManagerWrapper;
 
 import jakarta.validation.ValidationException;
 import java.net.IDN;
 import java.util.List;
 import java.util.Optional;
+import java.util.UUID;
 import java.util.function.Function;
 
 import static net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType.DOMAIN_DNS_SETUP;
@@ -109,8 +111,8 @@ public class DomainSetupHostingAssetFactory extends HostingAssetFactory {
         final var subAssetResourceOptional = findSubHostingAssetResource(resourceType);
 
         subAssetResourceOptional.ifPresentOrElse(
-                subAssetResource -> verifyNotOverspecified(subAssetResource),
-                () -> { throw new ValidationException("sub-asset of type " + resourceType.name() + " required in legacy mode, but missing"); }
+            this::verifyNotOverspecified,
+            () -> { throw new ValidationException("sub-asset of type " + resourceType.name() + " required in legacy mode, but missing"); }
         );
 
         return builderTransformer.apply(
@@ -150,4 +152,8 @@ public class DomainSetupHostingAssetFactory extends HostingAssetFactory {
         super.persist(newHostingAsset);
         newHostingAsset.getSubHostingAssets().forEach(super::persist);
     }
+
+    private <T> T ref(final Class<T> entityClass, final UUID uuid) {
+        return uuid != null ? emw.getReference(entityClass, uuid) : null;
+    }
 }

src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/factories/HostingAssetFactory.java

@@ -1,5 +1,6 @@
 package net.hostsharing.hsadminng.hs.hosting.asset.factories;
 
+import jakarta.validation.ValidationException;
 import lombok.RequiredArgsConstructor;
 import net.hostsharing.hsadminng.hs.booking.generated.api.v1.model.HsHostingAssetAutoInsertResource;
 import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemRealEntity;
@@ -8,7 +9,6 @@ import net.hostsharing.hsadminng.hs.hosting.asset.validators.HostingAssetEntityS
 import net.hostsharing.hsadminng.mapper.StandardMapper;
 import net.hostsharing.hsadminng.persistence.EntityManagerWrapper;
 
-import java.util.UUID;
 
 @RequiredArgsConstructor
 abstract class HostingAssetFactory {
@@ -20,13 +20,13 @@ abstract class HostingAssetFactory {
 
     protected abstract HsHostingAsset create();
 
-    public String performSaveProcess() {
+    public String createAndPersist() {
         try {
-            final var newHostingAsset = create();
+            final HsHostingAsset newHostingAsset = create();
             persist(newHostingAsset);
             return null;
-        } catch (final Exception e) {
-            return e.getMessage();
+        } catch (final ValidationException exc) {
+            return exc.getMessage();
         }
     }
 
@@ -38,8 +38,4 @@ abstract class HostingAssetFactory {
                 .save()
                 .validateContext();
     }
-
-    protected <T> T ref(final Class<T> entityClass, final UUID uuid) {
-        return uuid != null ? emw.getReference(entityClass, uuid) : null;
-    }
 }

src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/factories/HsBookingItemCreatedListener.java

@@ -2,6 +2,8 @@ package net.hostsharing.hsadminng.hs.hosting.asset.factories;
 
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
+import jakarta.validation.ValidationException;
+import jakarta.validation.constraints.NotNull;
 import lombok.SneakyThrows;
 import net.hostsharing.hsadminng.hs.booking.generated.api.v1.model.HsHostingAssetAutoInsertResource;
 import net.hostsharing.hsadminng.hs.booking.item.BookingItemCreatedAppEvent;
@@ -13,7 +15,6 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.ApplicationListener;
 import org.springframework.stereotype.Component;
 
-
 @Component
 public class HsBookingItemCreatedListener implements ApplicationListener<BookingItemCreatedAppEvent> {
 
@@ -28,7 +29,7 @@ public class HsBookingItemCreatedListener implements ApplicationListener<Booking
 
     @Override
     @SneakyThrows
-    public void onApplicationEvent(final BookingItemCreatedAppEvent bookingItemCreatedAppEvent) {
+    public void onApplicationEvent(@NotNull BookingItemCreatedAppEvent bookingItemCreatedAppEvent) {
         if (containsAssetJson(bookingItemCreatedAppEvent)) {
             createRelatedHostingAsset(bookingItemCreatedAppEvent);
         }
@@ -48,7 +49,7 @@ public class HsBookingItemCreatedListener implements ApplicationListener<Booking
             case DOMAIN_SETUP -> new DomainSetupHostingAssetFactory(emw, newBookingItemRealEntity, asset, standardMapper);
         };
         if (factory != null) {
-            final var statusMessage = factory.performSaveProcess();
+            final var statusMessage = factory.createAndPersist();
             // TODO.impl: once we implement retry, we need to amend this code (persist/merge/delete)
             if (statusMessage != null) {
                 event.getEntity().setStatusMessage(statusMessage);
@@ -68,12 +69,7 @@ public class HsBookingItemCreatedListener implements ApplicationListener<Booking
             @Override
             protected HsHostingAsset create() {
                 // TODO.impl: we should validate the asset JSON, but some violations are un-avoidable at that stage
-                return null;
-            }
-
-            @Override
-            public String performSaveProcess() {
-                return "waiting for manual setup of hosting asset for booking item of type " + fromBookingItem.getType();
+                throw new ValidationException("waiting for manual setup of hosting asset for booking item of type " + fromBookingItem.getType());
             }
         };
     }

src/main/java/net/hostsharing/hsadminng/hs/office/relation/HsOfficeRelationController.java

@@ -47,16 +47,17 @@ public class HsOfficeRelationController implements HsOfficeRelationsApi {
     public ResponseEntity<List<HsOfficeRelationResource>> listRelations(
             final String currentSubject,
             final String assumedRoles,
-            UUID personUuid,
-            HsOfficeRelationTypeResource relationType,
-            String personData,
-            String contactData) {
+            final UUID personUuid,
+            final HsOfficeRelationTypeResource relationType,
+            final String personData,
+            final String contactData) {
         context.define(currentSubject, assumedRoles);
 
-        final var entities =
+        final List<HsOfficeRelationRbacEntity> entities =
             ( personData == null && contactData == null )
-                    ? relationRbacRepo.findRelationRelatedToPersonUuidAndRelationType(personUuid,
-                        relationType == null ? null : HsOfficeRelationType.valueOf(relationType.name()))
+                    ? relationRbacRepo.findRelationRelatedToPersonUuidRelationTypePersonAndContactData(personUuid,
+                        relationType == null ? null : HsOfficeRelationType.valueOf(relationType.name()),
+                        personData, contactData)
                     : relationRbacRepo.findRelationRelatedToPersonUuidRelationTypePersonAndContactData(
                             personUuid,
                             relationType == null ? null : HsOfficeRelationType.valueOf(relationType.name()),
@@ -152,10 +153,6 @@ public class HsOfficeRelationController implements HsOfficeRelationsApi {
         return ResponseEntity.ok(mapped);
     }
 
-    private String forLike(final String text) {
-        return text == null ? null : ("%" + text.toLowerCase() + "%");
-    }
-
     final BiConsumer<HsOfficeRelationRbacEntity, HsOfficeRelationResource> RELATION_ENTITY_TO_RESOURCE_POSTMAPPER = (entity, resource) -> {
         resource.setAnchor(mapper.map(entity.getAnchor(), HsOfficePersonResource.class));
         resource.setHolder(mapper.map(entity.getHolder(), HsOfficePersonResource.class));

src/main/java/net/hostsharing/hsadminng/hs/office/relation/HsOfficeRelationRbacRepository.java

@@ -12,22 +12,50 @@ public interface HsOfficeRelationRbacRepository extends Repository<HsOfficeRelat
 
     Optional<HsOfficeRelationRbacEntity> findByUuid(UUID id);
 
-    default List<HsOfficeRelationRbacEntity> findRelationRelatedToPersonUuidAndRelationType(@NotNull UUID personUuid, HsOfficeRelationType relationType) {
-        return findRelationRelatedToPersonUuidAndRelationTypeString(personUuid, relationType == null ? null : relationType.toString());
-    }
-
     @Query(value = """
             SELECT p.* FROM hs_office.relation_rv AS p
                 WHERE p.anchorUuid = :personUuid OR p.holderUuid = :personUuid
             """, nativeQuery = true)
     List<HsOfficeRelationRbacEntity> findRelationRelatedToPersonUuid(@NotNull UUID personUuid);
 
+    /**
+     * Finds relations by a conjunction of optional criteria, including anchorPerson, holderPerson and contact data.
+     *      *
+     * @param personUuid the optional UUID of the anchorPerson or holderPerson
+     * @param relationType the type of the relation
+     * @param personData a string to match the persons tradeName, familyName or givenName (use '%' for wildcard), case ignored
+     * @param contactData a string to match the contacts caption, postalAddress, emailAddresses or phoneNumbers (use '%' for wildcard), case ignored
+     * @return a list of (accessible) relations which match all given criteria
+     */
+    default List<HsOfficeRelationRbacEntity> findRelationRelatedToPersonUuidRelationTypePersonAndContactData(
+            UUID personUuid,
+            HsOfficeRelationType relationType,
+            String personData,
+            String contactData) {
+        return findRelationRelatedToPersonUuidRelationTypePersonAndContactDataImpl(
+                personUuid, toStringOrNull(relationType), toSqlLikeOperand(personData), toSqlLikeOperand(contactData));
+    }
+
     @Query(value = """
-            SELECT p.* FROM hs_office.relation_rv AS p
-                WHERE (:relationType IS NULL OR p.type = cast(:relationType AS hs_office.RelationType))
-                    AND ( p.anchorUuid = :personUuid OR p.holderUuid = :personUuid)
-            """, nativeQuery = true)
-    List<HsOfficeRelationRbacEntity> findRelationRelatedToPersonUuidAndRelationTypeString(@NotNull UUID personUuid, String relationType);
+            SELECT rel FROM HsOfficeRelationRbacEntity AS rel
+                WHERE (:relationType IS NULL OR CAST(rel.type AS String) = :relationType)
+                    AND ( :personUuid IS NULL
+                            OR rel.anchor.uuid = :personUuid OR rel.holder.uuid = :personUuid )
+                    AND ( :personData IS NULL
+                            OR lower(rel.anchor.tradeName) LIKE :personData OR lower(rel.holder.tradeName) LIKE :personData
+                            OR lower(rel.anchor.familyName) LIKE :personData OR lower(rel.holder.familyName) LIKE :personData
+                            OR lower(rel.anchor.givenName) LIKE :personData OR lower(rel.holder.givenName) LIKE :personData )
+                    AND ( :contactData IS NULL
+                            OR lower(rel.contact.caption) LIKE :contactData
+                            OR lower(rel.contact.postalAddress) LIKE :contactData
+                            OR lower(CAST(rel.contact.emailAddresses AS String)) LIKE :contactData
+                            OR lower(CAST(rel.contact.phoneNumbers AS String)) LIKE :contactData )
+            """)
+    List<HsOfficeRelationRbacEntity> findRelationRelatedToPersonUuidRelationTypePersonAndContactDataImpl(
+            final UUID personUuid,
+            final String relationType,
+            final String personData,
+            final String contactData);
 
     /**
      * Finds relations by a conjunction of optional criteria, including anchorPerson, holderPerson and contact data.
@@ -64,4 +92,12 @@ public interface HsOfficeRelationRbacRepository extends Repository<HsOfficeRelat
     long count();
 
     int deleteByUuid(UUID uuid);
+
+    private static String toSqlLikeOperand(final String text) {
+        return text == null ? null : ("%" + text.toLowerCase() + "%");
+    }
+
+    private static String toStringOrNull(final HsOfficeRelationType relationType) {
+        return relationType == null ? null : relationType.name();
+    }
 }

src/main/java/net/hostsharing/hsadminng/hs/validation/IntegerProperty.java

@@ -56,6 +56,10 @@ public class IntegerProperty<P extends IntegerProperty<P>> extends ValidatablePr
         return unit;
     }
 
+    public Integer min() {
+        return min;
+    }
+
     public Integer max() {
         return max;
     }

src/main/java/net/hostsharing/hsadminng/hs/validation/StringProperty.java

@@ -3,6 +3,7 @@ package net.hostsharing.hsadminng.hs.validation;
 import lombok.AccessLevel;
 import lombok.Setter;
 import net.hostsharing.hsadminng.mapper.Array;
+import org.apache.commons.lang3.ArrayUtils;
 
 import java.util.Arrays;
 import java.util.List;
@@ -83,11 +84,15 @@ public class StringProperty<P extends StringProperty<P>> extends ValidatableProp
     }
 
     /// predefined values, similar to fixed values in a combobox
-    public P provided(final String... provided) {
-        this.provided = provided;
+    public P provided(final String firstProvidedValue, final String... moreProvidedValues) {
+        this.provided = ArrayUtils.addAll(new String[]{firstProvidedValue}, moreProvidedValues);
         return self();
     }
 
+    public String[] provided() {
+        return this.provided;
+    }
+
     /**
      * The property value is not disclosed in error messages.
      *
@@ -109,7 +114,11 @@ public class StringProperty<P extends StringProperty<P>> extends ValidatableProp
 
     @Override
     protected String display(final String propValue) {
-        return undisclosed ? "provided value" : ("'" + propValue + "'");
+        return undisclosed
+            ? "provided value"
+            : propValue != null
+                ? ("'" + propValue + "'")
+                : null;
     }
 
     @Override

src/main/java/net/hostsharing/hsadminng/lambda/Reducer.java

@@ -1,7 +1,10 @@
 package net.hostsharing.hsadminng.lambda;
 
+import lombok.experimental.UtilityClass;
+
+@UtilityClass
 public class Reducer {
-    public static  <T> T toSingleElement(T last, T next) {
+    public static  <T> T toSingleElement(T ignoredLast, T ignoredNext) {
         throw new AssertionError("only a single entity expected");
     }
 

src/main/java/net/hostsharing/hsadminng/mapper/ToStringConverter.java

@@ -1,9 +1,6 @@
-package net.hostsharing.hsadminng.hs.hosting.asset.factories;
+package net.hostsharing.hsadminng.mapper;
 
-import java.util.Arrays;
-import java.util.HashSet;
-import java.util.Objects;
-import java.util.Set;
+import java.util.*;
 
 import static java.util.stream.Collectors.joining;
 
@@ -16,8 +13,7 @@ public class ToStringConverter {
         return this;
     }
 
-    public String from(Object obj) {
-        StringBuilder result = new StringBuilder();
+    public String from(final Object obj) {
         return "{ " +
             Arrays.stream(obj.getClass().getDeclaredFields())
                     .filter(f -> !ignoredFields.contains(f.getName()))
@@ -34,4 +30,15 @@ public class ToStringConverter {
                     .collect(joining(", "))
         + " }";
     }
+
+    public String from(final Map<?, ?> map) {
+        return "{ "
+            + map.keySet().stream()
+                .filter(key -> !ignoredFields.contains(key.toString()))
+                .sorted()
+                .map(k -> Map.entry(k, map.get(k)))
+                .map(e -> e.getKey() + ": " + e.getValue())
+                .collect(joining(", "))
+            + " }";
+    }
 }

src/main/java/net/hostsharing/hsadminng/rbac/grant/RbacGrantsDiagramService.java

@@ -62,7 +62,7 @@ public class RbacGrantsDiagramService {
     @PersistenceContext
     private EntityManager em;
 
-    private Map<UUID, List<RawRbacGrantEntity>> descendantsByUuid = new HashMap<>();
+    private final Map<UUID, List<RawRbacGrantEntity>> descendantsByUuid = new HashMap<>();
 
     public String allGrantsTocurrentSubject(final EnumSet<Include> includes) {
         final var graph = new LimitedHashSet<RawRbacGrantEntity>();
@@ -231,8 +231,7 @@ public class RbacGrantsDiagramService {
         }
     }
 
-}
-
-record Node(String idName, UUID uuid) {
+    record Node(String idName, UUID uuid) {
 
+    }
 }

src/test/java/net/hostsharing/hsadminng/hs/booking/item/HsBookingItemRbacEntityUnitTest.java

@@ -0,0 +1,72 @@
+package net.hostsharing.hsadminng.hs.booking.item;
+
+import net.hostsharing.hsadminng.rbac.generator.RbacViewMermaidFlowchartGenerator;
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class HsBookingItemRbacEntityUnitTest {
+
+    @Test
+    void definesRbac() {
+        final var rbacFlowchart = new RbacViewMermaidFlowchartGenerator(HsBookingItemRbacEntity.rbac()).toString();
+        assertThat(rbacFlowchart).isEqualTo("""
+            %%{init:{'flowchart':{'htmlLabels':false}}}%%
+            flowchart TB
+
+            subgraph bookingItem["`**bookingItem**`"]
+                direction TB
+                style bookingItem fill:#dd4901,stroke:#274d6e,stroke-width:8px
+
+                subgraph bookingItem:roles[ ]
+                    style bookingItem:roles fill:#dd4901,stroke:white
+
+                    role:bookingItem:OWNER[[bookingItem:OWNER]]
+                    role:bookingItem:ADMIN[[bookingItem:ADMIN]]
+                    role:bookingItem:AGENT[[bookingItem:AGENT]]
+                    role:bookingItem:TENANT[[bookingItem:TENANT]]
+                end
+
+                subgraph bookingItem:permissions[ ]
+                    style bookingItem:permissions fill:#dd4901,stroke:white
+
+                    perm:bookingItem:INSERT{{bookingItem:INSERT}}
+                    perm:bookingItem:DELETE{{bookingItem:DELETE}}
+                    perm:bookingItem:UPDATE{{bookingItem:UPDATE}}
+                    perm:bookingItem:SELECT{{bookingItem:SELECT}}
+                end
+            end
+
+            subgraph project["`**project**`"]
+                direction TB
+                style project fill:#99bcdb,stroke:#274d6e,stroke-width:8px
+
+                subgraph project:roles[ ]
+                    style project:roles fill:#99bcdb,stroke:white
+
+                    role:project:OWNER[[project:OWNER]]
+                    role:project:ADMIN[[project:ADMIN]]
+                    role:project:AGENT[[project:AGENT]]
+                    role:project:TENANT[[project:TENANT]]
+                end
+            end
+
+            %% granting roles to roles
+            role:project:OWNER -.-> role:project:ADMIN
+            role:project:ADMIN -.-> role:project:AGENT
+            role:project:AGENT -.-> role:project:TENANT
+            role:project:AGENT ==> role:bookingItem:OWNER
+            role:bookingItem:OWNER ==> role:bookingItem:ADMIN
+            role:bookingItem:ADMIN ==> role:bookingItem:AGENT
+            role:bookingItem:AGENT ==> role:bookingItem:TENANT
+            role:bookingItem:TENANT ==> role:project:TENANT
+
+            %% granting permissions to roles
+            role:rbac.global:ADMIN ==> perm:bookingItem:INSERT
+            role:rbac.global:ADMIN ==> perm:bookingItem:DELETE
+            role:project:ADMIN ==> perm:bookingItem:INSERT
+            role:bookingItem:ADMIN ==> perm:bookingItem:UPDATE
+            role:bookingItem:TENANT ==> perm:bookingItem:SELECT
+            """);
+    }
+}

src/test/java/net/hostsharing/hsadminng/hs/booking/project/HsBookingProjectRbacEntityUnitTest.java

@@ -0,0 +1,95 @@
+package net.hostsharing.hsadminng.hs.booking.project;
+
+import net.hostsharing.hsadminng.hs.booking.debitor.HsBookingDebitorEntity;
+import net.hostsharing.hsadminng.rbac.generator.RbacViewMermaidFlowchartGenerator;
+import org.junit.jupiter.api.Test;
+
+import java.util.UUID;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class HsBookingProjectRbacEntityUnitTest {
+
+    @Test
+    void toStringForEmptyInstance() {
+        final var givenEntity = HsBookingProjectRbacEntity.builder().build();
+        assertThat(givenEntity.toString()).isEqualTo("HsBookingProject()");
+    }
+
+    @Test
+    void toStringForFullyInitializedInstance() {
+        final var givenDebitor = HsBookingDebitorEntity.builder()
+            .debitorNumber(123456)
+            .build();
+        final var givenUuid = UUID.randomUUID();
+        final var givenEntity = HsBookingProjectRbacEntity.builder()
+            .uuid(givenUuid)
+            .debitor(givenDebitor)
+            .caption("some project")
+            .build();
+        assertThat(givenEntity.toString()).isEqualTo("HsBookingProject(D-123456, some project)");
+    }
+
+    @Test
+    void definesRbac() {
+        final var rbacFlowchart = new RbacViewMermaidFlowchartGenerator(HsBookingProjectRbacEntity.rbac()).toString();
+        assertThat(rbacFlowchart).isEqualTo("""
+            %%{init:{'flowchart':{'htmlLabels':false}}}%%
+            flowchart TB
+
+            subgraph debitorRel["`**debitorRel**`"]
+                direction TB
+                style debitorRel fill:#99bcdb,stroke:#274d6e,stroke-width:8px
+
+                subgraph debitorRel:roles[ ]
+                    style debitorRel:roles fill:#99bcdb,stroke:white
+
+                    role:debitorRel:OWNER[[debitorRel:OWNER]]
+                    role:debitorRel:ADMIN[[debitorRel:ADMIN]]
+                    role:debitorRel:AGENT[[debitorRel:AGENT]]
+                    role:debitorRel:TENANT[[debitorRel:TENANT]]
+                end
+            end
+
+            subgraph project["`**project**`"]
+                direction TB
+                style project fill:#dd4901,stroke:#274d6e,stroke-width:8px
+
+                subgraph project:roles[ ]
+                    style project:roles fill:#dd4901,stroke:white
+
+                    role:project:OWNER[[project:OWNER]]
+                    role:project:ADMIN[[project:ADMIN]]
+                    role:project:AGENT[[project:AGENT]]
+                    role:project:TENANT[[project:TENANT]]
+                end
+
+                subgraph project:permissions[ ]
+                    style project:permissions fill:#dd4901,stroke:white
+
+                    perm:project:INSERT{{project:INSERT}}
+                    perm:project:DELETE{{project:DELETE}}
+                    perm:project:UPDATE{{project:UPDATE}}
+                    perm:project:SELECT{{project:SELECT}}
+                end
+            end
+
+            %% granting roles to roles
+            role:rbac.global:ADMIN -.-> role:debitorRel:OWNER
+            role:debitorRel:OWNER -.-> role:debitorRel:ADMIN
+            role:debitorRel:ADMIN -.-> role:debitorRel:AGENT
+            role:debitorRel:AGENT -.-> role:debitorRel:TENANT
+            role:debitorRel:AGENT ==>|XX| role:project:OWNER
+            role:project:OWNER ==> role:project:ADMIN
+            role:project:ADMIN ==> role:project:AGENT
+            role:project:AGENT ==> role:project:TENANT
+            role:project:TENANT ==> role:debitorRel:TENANT
+
+            %% granting permissions to roles
+            role:debitorRel:ADMIN ==> perm:project:INSERT
+            role:rbac.global:ADMIN ==> perm:project:DELETE
+            role:project:ADMIN ==> perm:project:UPDATE
+            role:project:TENANT ==> perm:project:SELECT
+            """);
+    }
+}

src/test/java/net/hostsharing/hsadminng/hs/hosting/asset/HsHostingAssetRbacEntityUnitTest.java

@@ -0,0 +1,126 @@
+package net.hostsharing.hsadminng.hs.hosting.asset;
+
+import net.hostsharing.hsadminng.rbac.generator.RbacViewMermaidFlowchartGenerator;
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class HsHostingAssetRbacEntityUnitTest {
+
+    @Test
+    void definesRbac() {
+        final var rbacFlowchart = new RbacViewMermaidFlowchartGenerator(HsHostingAssetRbacEntity.rbac()).toString();
+        assertThat(rbacFlowchart).isEqualTo("""
+            %%{init:{'flowchart':{'htmlLabels':false}}}%%
+            flowchart TB
+
+            subgraph alarmContact["`**alarmContact**`"]
+                direction TB
+                style alarmContact fill:#99bcdb,stroke:#274d6e,stroke-width:8px
+
+                subgraph alarmContact:roles[ ]
+                    style alarmContact:roles fill:#99bcdb,stroke:white
+
+                    role:alarmContact:OWNER[[alarmContact:OWNER]]
+                    role:alarmContact:ADMIN[[alarmContact:ADMIN]]
+                    role:alarmContact:REFERRER[[alarmContact:REFERRER]]
+                end
+            end
+
+            subgraph asset["`**asset**`"]
+                direction TB
+                style asset fill:#dd4901,stroke:#274d6e,stroke-width:8px
+
+                subgraph asset:roles[ ]
+                    style asset:roles fill:#dd4901,stroke:white
+
+                    role:asset:OWNER[[asset:OWNER]]
+                    role:asset:ADMIN[[asset:ADMIN]]
+                    role:asset:AGENT[[asset:AGENT]]
+                    role:asset:TENANT[[asset:TENANT]]
+                end
+
+                subgraph asset:permissions[ ]
+                    style asset:permissions fill:#dd4901,stroke:white
+
+                    perm:asset:INSERT{{asset:INSERT}}
+                    perm:asset:DELETE{{asset:DELETE}}
+                    perm:asset:UPDATE{{asset:UPDATE}}
+                    perm:asset:SELECT{{asset:SELECT}}
+                end
+            end
+
+            subgraph assignedToAsset["`**assignedToAsset**`"]
+                direction TB
+                style assignedToAsset fill:#99bcdb,stroke:#274d6e,stroke-width:8px
+
+                subgraph assignedToAsset:roles[ ]
+                    style assignedToAsset:roles fill:#99bcdb,stroke:white
+
+                    role:assignedToAsset:AGENT[[assignedToAsset:AGENT]]
+                    role:assignedToAsset:TENANT[[assignedToAsset:TENANT]]
+                end
+            end
+
+            subgraph bookingItem["`**bookingItem**`"]
+                direction TB
+                style bookingItem fill:#99bcdb,stroke:#274d6e,stroke-width:8px
+
+                subgraph bookingItem:roles[ ]
+                    style bookingItem:roles fill:#99bcdb,stroke:white
+
+                    role:bookingItem:OWNER[[bookingItem:OWNER]]
+                    role:bookingItem:ADMIN[[bookingItem:ADMIN]]
+                    role:bookingItem:AGENT[[bookingItem:AGENT]]
+                    role:bookingItem:TENANT[[bookingItem:TENANT]]
+                end
+            end
+
+            subgraph parentAsset["`**parentAsset**`"]
+                direction TB
+                style parentAsset fill:#99bcdb,stroke:#274d6e,stroke-width:8px
+
+                subgraph parentAsset:roles[ ]
+                    style parentAsset:roles fill:#99bcdb,stroke:white
+
+                    role:parentAsset:ADMIN[[parentAsset:ADMIN]]
+                    role:parentAsset:AGENT[[parentAsset:AGENT]]
+                    role:parentAsset:TENANT[[parentAsset:TENANT]]
+                end
+            end
+
+            %% granting roles to users
+            user:creator ==> role:asset:OWNER
+
+            %% granting roles to roles
+            role:bookingItem:OWNER -.-> role:bookingItem:ADMIN
+            role:bookingItem:ADMIN -.-> role:bookingItem:AGENT
+            role:bookingItem:AGENT -.-> role:bookingItem:TENANT
+            role:rbac.global:ADMIN -.-> role:alarmContact:OWNER
+            role:alarmContact:OWNER -.-> role:alarmContact:ADMIN
+            role:alarmContact:ADMIN -.-> role:alarmContact:REFERRER
+            role:rbac.global:ADMIN ==>|XX| role:asset:OWNER
+            role:bookingItem:ADMIN ==> role:asset:OWNER
+            role:parentAsset:ADMIN ==> role:asset:OWNER
+            role:asset:OWNER ==> role:asset:ADMIN
+            role:bookingItem:AGENT ==> role:asset:ADMIN
+            role:parentAsset:AGENT ==> role:asset:ADMIN
+            role:asset:ADMIN ==> role:asset:AGENT
+            role:assignedToAsset:AGENT ==> role:asset:AGENT
+            role:asset:AGENT ==> role:assignedToAsset:TENANT
+            role:asset:AGENT ==> role:alarmContact:REFERRER
+            role:asset:AGENT ==> role:asset:TENANT
+            role:asset:TENANT ==> role:bookingItem:TENANT
+            role:asset:TENANT ==> role:parentAsset:TENANT
+            role:alarmContact:ADMIN ==> role:asset:TENANT
+
+            %% granting permissions to roles
+            role:rbac.global:ADMIN ==> perm:asset:INSERT
+            role:parentAsset:ADMIN ==> perm:asset:INSERT
+            role:rbac.global:GUEST ==> perm:asset:INSERT
+            role:asset:OWNER ==> perm:asset:DELETE
+            role:asset:ADMIN ==> perm:asset:UPDATE
+            role:asset:TENANT ==> perm:asset:SELECT
+            """);
+    }
+}

src/test/java/net/hostsharing/hsadminng/hs/office/debitor/HsOfficeDebitorEntityUnitTest.java

@@ -6,14 +6,13 @@ import net.hostsharing.hsadminng.hs.office.person.HsOfficePersonEntity;
 import net.hostsharing.hsadminng.hs.office.person.HsOfficePersonType;
 import net.hostsharing.hsadminng.hs.office.relation.HsOfficeRelationRealEntity;
 import net.hostsharing.hsadminng.rbac.generator.RbacViewMermaidFlowchartGenerator;
-import net.hostsharing.hsadminng.rbac.test.cust.TestCustomerEntity;
 import org.junit.jupiter.api.Test;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
 class HsOfficeDebitorEntityUnitTest {
 
-    private HsOfficeRelationRealEntity givenDebitorRel = HsOfficeRelationRealEntity.builder()
+    private final HsOfficeRelationRealEntity givenDebitorRel = HsOfficeRelationRealEntity.builder()
             .anchor(HsOfficePersonEntity.builder()
                     .personType(HsOfficePersonType.LEGAL_PERSON)
                     .tradeName("some partner trade name")

src/test/java/net/hostsharing/hsadminng/hs/office/membership/HsOfficeMembershipEntityUnitTest.java

@@ -1,7 +1,6 @@
 package net.hostsharing.hsadminng.hs.office.membership;
 
 import io.hypersistence.utils.hibernate.type.range.Range;
-import net.hostsharing.hsadminng.hs.office.debitor.HsOfficeDebitorEntity;
 import net.hostsharing.hsadminng.hs.office.partner.HsOfficePartnerEntity;
 import net.hostsharing.hsadminng.rbac.generator.RbacViewMermaidFlowchartGenerator;
 import org.junit.jupiter.api.Test;

src/test/java/net/hostsharing/hsadminng/hs/office/person/HsOfficePersonEntityUnitTest.java

@@ -1,6 +1,5 @@
 package net.hostsharing.hsadminng.hs.office.person;
 
-import net.hostsharing.hsadminng.hs.office.partner.HsOfficePartnerEntity;
 import net.hostsharing.hsadminng.rbac.generator.RbacViewMermaidFlowchartGenerator;
 import org.junit.jupiter.api.Test;
 

src/test/java/net/hostsharing/hsadminng/hs/office/relation/HsOfficeRelationControllerAcceptanceTest.java

@@ -177,39 +177,39 @@ class HsOfficeRelationControllerAcceptanceTest extends ContextBasedTestWithClean
 
             RestAssured // @formatter:off
                     .given()
-                    .header("current-subject", "superuser-alex@hostsharing.net")
-                    .port(port)
+                        .header("current-subject", "superuser-alex@hostsharing.net")
+                        .port(port)
                     .when()
-                    .get("http://localhost/api/hs/office/relations?personData=firby&contactData=Contact-Admin@FirstContact.Example.COM")
+                        .get("http://localhost/api/hs/office/relations?personData=firby&contactData=Contact-Admin@FirstContact.Example.COM")
                     .then().log().all().assertThat()
-                    .statusCode(200)
-                    .contentType("application/json")
-                    .body("", lenientlyEquals("""
-                    [
-                        {
-                            "anchor": {
-                                "personType": "LEGAL_PERSON",
-                                "tradeName": "First GmbH"
-                            },
-                            "holder": {
-                                "personType": "NATURAL_PERSON",
-                                "givenName": "Susan",
-                                "familyName": "Firby"
-                            },
-                            "type": "REPRESENTATIVE",
-                            "contact": {
-                                "caption": "first contact",
-                                "postalAddress": "Vorname Nachname\\nStraße Hnr\\nPLZ Stadt",
-                                "emailAddresses": {
-                                    "main": "contact-admin@firstcontact.example.com"
+                        .statusCode(200)
+                        .contentType("application/json")
+                        .body("", lenientlyEquals("""
+                        [
+                            {
+                                "anchor": {
+                                    "personType": "LEGAL_PERSON",
+                                    "tradeName": "First GmbH"
                                 },
-                                "phoneNumbers": {
-                                    "phone_office": "+49 123 1234567"
+                                "holder": {
+                                    "personType": "NATURAL_PERSON",
+                                    "givenName": "Susan",
+                                    "familyName": "Firby"
+                                },
+                                "type": "REPRESENTATIVE",
+                                "contact": {
+                                    "caption": "first contact",
+                                    "postalAddress": "Vorname Nachname\\nStraße Hnr\\nPLZ Stadt",
+                                    "emailAddresses": {
+                                        "main": "contact-admin@firstcontact.example.com"
+                                    },
+                                    "phoneNumbers": {
+                                        "phone_office": "+49 123 1234567"
+                                    }
                                 }
                             }
-                        }
-                    ]
-                    """));
+                        ]
+                        """));
             // @formatter:on
         }
     }

src/test/java/net/hostsharing/hsadminng/hs/office/relation/HsOfficeRelationRepositoryIntegrationTest.java

@@ -193,7 +193,7 @@ class HsOfficeRelationRepositoryIntegrationTest extends ContextBasedTestWithClea
                     .findFirst().orElseThrow();
 
             // when:
-            final var result = relationRbacRepo.findRelationRelatedToPersonUuidAndRelationType(person.getUuid(), null);
+            final var result = relationRbacRepo.findRelationRelatedToPersonUuidRelationTypePersonAndContactData(person.getUuid(), null, null, null);
 
             // then:
             exactlyTheseRelationsAreReturned(

src/test/java/net/hostsharing/hsadminng/hs/office/sepamandate/HsOfficeSepaMandateEntityUnitTest.java

@@ -1,7 +1,6 @@
 package net.hostsharing.hsadminng.hs.office.sepamandate;
 
 import net.hostsharing.hsadminng.hs.office.bankaccount.HsOfficeBankAccountEntity;
-import net.hostsharing.hsadminng.hs.office.relation.HsOfficeRelationRbacEntity;
 import net.hostsharing.hsadminng.rbac.generator.RbacViewMermaidFlowchartGenerator;
 import org.junit.jupiter.api.Test;
 

src/test/java/net/hostsharing/hsadminng/hs/validation/IntegerPropertyUnitTest.java

@@ -0,0 +1,65 @@
+package net.hostsharing.hsadminng.hs.validation;
+
+import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType;
+import org.junit.jupiter.api.Test;
+
+import java.util.Map;
+
+import static net.hostsharing.hsadminng.hs.validation.IntegerProperty.integerProperty;
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.catchThrowable;
+
+class IntegerPropertyUnitTest {
+
+    final IntegerProperty<?> partialIntegerProperty = integerProperty("test")
+        .min(1)
+        .max(9);
+
+    @Test
+    void returnsConfiguredSettings() {
+        final var IntegerProperty = partialIntegerProperty;
+        assertThat(IntegerProperty.propertyName()).isEqualTo("test");
+        assertThat(IntegerProperty.unit()).isNull();
+        assertThat(IntegerProperty.min()).isEqualTo(1);
+        assertThat(IntegerProperty.max()).isEqualTo(9);
+    }
+
+    @Test
+    void detectsIncompleteConfiguration() {
+        final var IntegerProperty = partialIntegerProperty;
+        final var exception = catchThrowable(() ->
+            IntegerProperty.verifyConsistency(Map.entry(HsBookingItemType.CLOUD_SERVER, "val"))
+        );
+        assertThat(exception).isNotNull().isInstanceOf(IllegalStateException.class).hasMessageContaining(
+            "CLOUD_SERVER[test] not fully initialized, please call either .readOnly(), .required(), .optional(), .withDefault(...), .requiresAtLeastOneOf(...) or .requiresAtMaxOneOf(...)"
+        );
+    }
+
+    @Test
+    void initializerCompletesProperty() {
+        // given
+        final var IntegerProperty = partialIntegerProperty
+                .initializedBy((entityManager, propertiesProvider) -> 7);
+
+        // then
+        isCompleted(IntegerProperty);
+        assertThat(IntegerProperty.isComputed(ValidatableProperty.ComputeMode.IN_INIT)).isTrue();
+        assertThat(IntegerProperty.compute(null, null)).isEqualTo(7);
+    }
+
+    @Test
+    void displaysNullValueAsNull() {
+        final var IntegerProperty = partialIntegerProperty.optional();
+        assertThat(IntegerProperty.display(null)).isNull();
+    }
+
+    @Test
+    void displayQuotesValue() {
+        final var IntegerProperty = partialIntegerProperty.optional();
+        assertThat(IntegerProperty.display(3)).isEqualTo("3");
+    }
+
+    private static void isCompleted(IntegerProperty<? extends IntegerProperty<?>> IntegerProperty) {
+        IntegerProperty.verifyConsistency(Map.entry(HsBookingItemType.CLOUD_SERVER, "val"));
+    }
+}

src/test/java/net/hostsharing/hsadminng/hs/validation/StringPropertyUnitTest.java

@@ -0,0 +1,69 @@
+package net.hostsharing.hsadminng.hs.validation;
+
+import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType;
+import net.hostsharing.hsadminng.mapper.Array;
+import org.junit.jupiter.api.Test;
+
+import java.util.Map;
+
+import static net.hostsharing.hsadminng.hs.validation.StringProperty.stringProperty;
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.catchThrowable;
+
+class StringPropertyUnitTest {
+
+    final StringProperty<?> partialStringProperty = stringProperty("test")
+        .minLength(1)
+        .maxLength(9)
+        .provided("one", "two", "three");
+
+    @Test
+    void returnsConfiguredSettings() {
+        final var stringProperty = partialStringProperty;
+        assertThat(stringProperty.propertyName()).isEqualTo("test");
+        assertThat(stringProperty.unit()).isNull();
+        assertThat(stringProperty.minLength()).isEqualTo(1);
+        assertThat(stringProperty.maxLength()).isEqualTo(9);
+        assertThat(stringProperty.provided()).isEqualTo(Array.of("one", "two", "three"));
+    }
+
+    @Test
+    void detectsIncompleteConfiguration() {
+        final var stringProperty = partialStringProperty;
+        final var exception = catchThrowable(() ->
+            stringProperty.verifyConsistency(Map.entry(HsBookingItemType.CLOUD_SERVER, "val"))
+        );
+        assertThat(exception).isNotNull().isInstanceOf(IllegalStateException.class).hasMessageContaining(
+            "CLOUD_SERVER[test] not fully initialized, please call either .readOnly(), .required(), .optional(), .withDefault(...), .requiresAtLeastOneOf(...) or .requiresAtMaxOneOf(...)"
+        );
+    }
+
+    @Test
+    void initializerCompletesProperty() {
+        // given
+        final var stringProperty = partialStringProperty
+                .initializedBy((entityManager, propertiesProvider) -> "init-value");
+
+        // then
+        isCompleted(stringProperty);
+        assertThat(stringProperty.isComputed(ValidatableProperty.ComputeMode.IN_INIT)).isTrue();
+        assertThat(stringProperty.compute(null, null)).isEqualTo("init-value");
+    }
+
+    @Test
+    void displaysNullValueAsNull() {
+        final var stringProperty = partialStringProperty.optional();
+        assertThat(stringProperty.display(null)).isNull();
+    }
+
+
+    @Test
+    void displayQuotesValue() {
+        final var stringProperty = partialStringProperty.optional();
+        assertThat(stringProperty.display("some value")).isEqualTo("'some value'");
+    }
+
+    private static void isCompleted(StringProperty<? extends StringProperty<?>> stringProperty) {
+        stringProperty.verifyConsistency(Map.entry(HsBookingItemType.CLOUD_SERVER, "val"));
+    }
+}

src/test/java/net/hostsharing/hsadminng/lambda/ReducerUnitTest.java

@@ -0,0 +1,32 @@
+package net.hostsharing.hsadminng.lambda;
+
+
+import org.junit.jupiter.api.Test;
+
+import java.util.stream.Stream;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.ThrowableAssert.catchThrowable;
+
+class ReducerUnitTest {
+
+    @Test
+    void throwsExceptionForMoreThanASingleElement() {
+        final var givenStream = Stream.of(1, 2);
+
+        final var exception = catchThrowable(() -> {
+                //noinspection ResultOfMethodCallIgnored
+                givenStream.reduce(Reducer::toSingleElement);
+            }
+        );
+
+        assertThat(exception).isInstanceOf(AssertionError.class);
+    }
+
+    @Test
+    void passesASingleElement() {
+        final var givenStream = Stream.of(7);
+        final var singleElement = givenStream.reduce(Reducer::toSingleElement);
+        assertThat(singleElement).contains(7);
+    }
+}

src/test/java/net/hostsharing/hsadminng/mapper/KeyValueMapUnitTest.java

@@ -0,0 +1,32 @@
+package net.hostsharing.hsadminng.mapper;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.catchThrowable;
+
+class KeyValueMapUnitTest {
+
+    final ToStringConverter toStringConverter = new ToStringConverter();
+
+    @Test
+    void fromMap() {
+        final var result = KeyValueMap.from(Map.ofEntries(
+            Map.entry("one", 1),
+            Map.entry("two", 2)
+        ));
+
+        assertThat(toStringConverter.from(result)).isEqualTo("{ one: 1, two: 2 }");
+    }
+
+    @Test
+    void fromNonMap() {
+        final var exception = catchThrowable( () ->
+            KeyValueMap.from("not a map")
+        );
+
+        assertThat(exception).isInstanceOf(ClassCastException.class);
+    }
+}

src/test/java/net/hostsharing/hsadminng/mapper/ToStringConverterUnitTest.java

@@ -0,0 +1,30 @@
+package net.hostsharing.hsadminng.mapper;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class ToStringConverterUnitTest {
+
+    @Test
+    void convertObjectToString() {
+        final var object = new SomeObject("a", 1, true);
+        final var result = new ToStringConverter().ignoring("three").from(object);
+        assertThat(result).isEqualTo("{ one: a, two: 1 }");
+    }
+
+    @Test
+    void convertMapToString() {
+        final var map = Map.ofEntries(
+            Map.entry("one", "a"),
+            Map.entry("two", 1),
+            Map.entry("three", true)
+        );
+        final var result = new ToStringConverter().ignoring("three").from(map);
+        assertThat(result).isEqualTo("{ one: a, two: 1 }");
+    }
+}
+
+record SomeObject(String one, int two, boolean three) {}