diff --git a/src/main/java/de/ozgcloud/admin/RootModelAssembler.java b/src/main/java/de/ozgcloud/admin/RootModelAssembler.java
index a2bfee632f155abf5c8e0b747bde49767050e8ff..479177c203e46590781de6cc4c6b824233547053 100644
--- a/src/main/java/de/ozgcloud/admin/RootModelAssembler.java
+++ b/src/main/java/de/ozgcloud/admin/RootModelAssembler.java
@@ -57,12 +57,13 @@ public class RootModelAssembler implements RepresentationModelAssembler<Root, En
 		var rootLinkBuilder = WebMvcLinkBuilder.linkTo(RootController.class);
 		links.add(rootLinkBuilder.withSelfRel());
 		if (currentUserService.hasRole(UserRole.ADMIN_USER)) {
-			links.add(buildConfigLink(rootLinkBuilder));
+			links.add(buildConfigLink());
 		}
 		return links;
 	}
 
-	private Link buildConfigLink(WebMvcLinkBuilder rootLinkBuilder) {
+	private Link buildConfigLink() {
+		var rootLinkBuilder = WebMvcLinkBuilder.linkTo(RootController.class);
 		return Link.of(
 				rootLinkBuilder.toUriComponentsBuilder().replacePath(restProperties.getBasePath()).toUriString(),
 				REL_CONFIGURATION
diff --git a/src/main/java/de/ozgcloud/admin/common/user/CurrentUserHelper.java b/src/main/java/de/ozgcloud/admin/common/user/CurrentUserHelper.java
index b41de92905942ccd5d72ed6e097ca5b1255299d9..16f4bf18d38516bbdf07cadfd58b9ce5fe793426 100644
--- a/src/main/java/de/ozgcloud/admin/common/user/CurrentUserHelper.java
+++ b/src/main/java/de/ozgcloud/admin/common/user/CurrentUserHelper.java
@@ -39,7 +39,7 @@ import lombok.AccessLevel;
 import lombok.NoArgsConstructor;
 
 @NoArgsConstructor(access = AccessLevel.PRIVATE)
-public class CurrentUserHelper {
+class CurrentUserHelper {
 	static final String ROLE_PREFIX = "ROLE_";
 	private static final Predicate<String> IS_ROLE_PREFIX_MISSING = role -> !role.startsWith(ROLE_PREFIX);
 	private static final AuthenticationTrustResolver TRUST_RESOLVER = new AuthenticationTrustResolverImpl();
@@ -65,7 +65,7 @@ public class CurrentUserHelper {
 	static String addRolePrefixIfMissing(String roleToCheck) {
 		return Optional.ofNullable(roleToCheck)
 				.filter(IS_ROLE_PREFIX_MISSING)
-				.map(role -> String.format("%s%s", ROLE_PREFIX, role))
+				.map(role -> ROLE_PREFIX + role)
 				.orElse(roleToCheck);
 	}
 
diff --git a/src/test/java/de/ozgcloud/admin/RootModelAssemblerTest.java b/src/test/java/de/ozgcloud/admin/RootModelAssemblerTest.java
index bd0696e7d2b94b6053cdb162c92de7cd39ad80e8..a08b15d54ddf45532608cb0fa77e7a8bc2227b40 100644
--- a/src/test/java/de/ozgcloud/admin/RootModelAssemblerTest.java
+++ b/src/test/java/de/ozgcloud/admin/RootModelAssemblerTest.java
@@ -62,7 +62,7 @@ class RootModelAssemblerTest {
 		}
 
 		@Test
-		void entityRootModelHasRoot() {
+		void shouldHaveRoot() {
 			var givenRoot = RootTestFactory.create();
 			List<Link> links = List.of();
 			Mockito.when(modelAssembler.buildRootModelLinks()).thenReturn(links);
@@ -73,7 +73,7 @@ class RootModelAssemblerTest {
 		}
 
 		@Test
-		void entityRootModelHasLinks() {
+		void shouldHaveLinks() {
 			List<Link> links = List.of(Link.of(RootController.PATH));
 			Mockito.when(modelAssembler.buildRootModelLinks()).thenReturn(links);
 
diff --git a/src/test/java/de/ozgcloud/admin/common/user/CurrentUserHelperTest.java b/src/test/java/de/ozgcloud/admin/common/user/CurrentUserHelperTest.java
index 272f51ca2db836f9e5a0d581703455a61bb762c7..ceffbadefbf8779eee19f63079566c5ac4f9b7a1 100644
--- a/src/test/java/de/ozgcloud/admin/common/user/CurrentUserHelperTest.java
+++ b/src/test/java/de/ozgcloud/admin/common/user/CurrentUserHelperTest.java
@@ -31,6 +31,8 @@ import java.util.List;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
 import org.mockito.Mock;
 import org.mockito.MockedStatic;
 import org.mockito.Mockito;
@@ -51,7 +53,7 @@ class CurrentUserHelperTest {
 		private final User mockPrincipal = Mockito.mock(User.class);
 
 		@Test
-		void shouldNotHaveRoleIfNull() {
+		void shouldReturnFalseOnMissingAuthentication() {
 			try (MockedStatic<CurrentUserHelper> mockUserHelper = Mockito.mockStatic(
 					CurrentUserHelper.class,
 					Mockito.CALLS_REAL_METHODS)) {
@@ -64,7 +66,7 @@ class CurrentUserHelperTest {
 		}
 
 		@Test
-		void shouldNotHaveRoleIfPrincipalIsNull() {
+		void shouldReturnFalseOnMissingPrincipal() {
 			Mockito.when(mockAuthentication.getPrincipal()).thenReturn(null);
 			try (MockedStatic<CurrentUserHelper> mockUserHelper = Mockito.mockStatic(
 					CurrentUserHelper.class,
@@ -77,27 +79,9 @@ class CurrentUserHelperTest {
 			}
 		}
 
-		@Test
-		void shouldNotHaveRole() {
-			Mockito.when(mockAuthentication.getPrincipal()).thenReturn(mockPrincipal);
-			List<GrantedAuthority> authorities = List.of();
-			Mockito.<Collection<? extends GrantedAuthority>>when(mockAuthentication.getAuthorities()).thenReturn(authorities);
-
-			try (MockedStatic<CurrentUserHelper> mockUserHelper = Mockito.mockStatic(
-					CurrentUserHelper.class,
-					Mockito.CALLS_REAL_METHODS)) {
-				mockUserHelper.when(CurrentUserHelper::getAuthentication).thenReturn(mockAuthentication);
-				mockUserHelper.when(() -> CurrentUserHelper.containsRole(Mockito.anyList(), Mockito.anyString()))
-						.thenReturn(false);
-
-				boolean hasRole = CurrentUserHelper.hasRole(UserRole.ADMIN_USER);
-
-				assertThat(hasRole).isFalse();
-			}
-		}
-
-		@Test
-		void shouldHaveRole() {
+		@ParameterizedTest
+		@ValueSource(booleans = {false, true})
+		void shouldReturnValue(boolean containsRoleValue) {
 			Mockito.when(mockAuthentication.getPrincipal()).thenReturn(mockPrincipal);
 			List<GrantedAuthority> authorities = List.of();
 			Mockito.<Collection<? extends GrantedAuthority>>when(mockAuthentication.getAuthorities()).thenReturn(authorities);
@@ -107,11 +91,12 @@ class CurrentUserHelperTest {
 					Mockito.CALLS_REAL_METHODS)) {
 				mockUserHelper.when(CurrentUserHelper::getAuthentication).thenReturn(mockAuthentication);
 				mockUserHelper.when(() -> CurrentUserHelper.containsRole(Mockito.anyList(), Mockito.anyString()))
-						.thenReturn(true);
+						.thenReturn(containsRoleValue);
 
 				boolean hasRole = CurrentUserHelper.hasRole(UserRole.ADMIN_USER);
 
-				assertThat(hasRole).isTrue();
+				mockUserHelper.verify(() -> CurrentUserHelper.containsRole(mockAuthentication.getAuthorities(), UserRole.ADMIN_USER));
+				assertThat(hasRole).isEqualTo(containsRoleValue);
 			}
 		}
 	}
@@ -120,7 +105,7 @@ class CurrentUserHelperTest {
 	@Nested
 	class TestContainsRole {
 		@Test
-		void shouldNotContainRoleIfNull() {
+		void shouldNotContainRoleIfAuthoritiesIsNull() {
 			boolean containsRole = CurrentUserHelper.containsRole(null, UserRole.ADMIN_USER);
 
 			assertThat(containsRole).isFalse();
@@ -147,9 +132,9 @@ class CurrentUserHelperTest {
 		}
 	}
 
-	@DisplayName("Prepare role for check")
+	@DisplayName("Add Role Prefix If Missing")
 	@Nested
-	class TestPrepareRoleForCheck {
+	class TestAddRolePrefixIfMissing {
 
 		@Test
 		void shouldAddPrefixIfMissing() {
@@ -157,12 +142,12 @@ class CurrentUserHelperTest {
 
 			var role = CurrentUserHelper.addRolePrefixIfMissing(roleWithoutPrefix);
 
-			assertThat(role).isEqualTo(String.format("%s%s", CurrentUserHelper.ROLE_PREFIX, UserRole.ADMIN_USER));
+			assertThat(role).isEqualTo(CurrentUserHelper.ROLE_PREFIX + UserRole.ADMIN_USER);
 		}
 
 		@Test
 		void shouldReturnRoleIfPrefixAlreadyExists() {
-			var roleWithPrefix = String.format("ROLE_%s", UserRole.ADMIN_USER);
+			var roleWithPrefix = CurrentUserHelper.ROLE_PREFIX + UserRole.ADMIN_USER;
 
 			var role = CurrentUserHelper.addRolePrefixIfMissing(roleWithPrefix);
 
@@ -184,7 +169,7 @@ class CurrentUserHelperTest {
 		private final SecurityContext mockSecurityContext = Mockito.mock(SecurityContext.class);
 
 		@Test
-		void shouldThrowIfNull() {
+		void shouldThrowIfNoAuthenticatedUser() {
 			Mockito.when(mockSecurityContext.getAuthentication()).thenReturn(null);
 
 			try (MockedStatic<SecurityContextHolder> contextHolder = Mockito.mockStatic(SecurityContextHolder.class)) {
diff --git a/src/test/java/de/ozgcloud/admin/common/user/CurrentUserServiceTest.java b/src/test/java/de/ozgcloud/admin/common/user/CurrentUserServiceTest.java
index 4e2f38123a3f02741cf940974756366a86b7ab8b..20e75bfc94b321b65e0884ecad643ed28192af33 100644
--- a/src/test/java/de/ozgcloud/admin/common/user/CurrentUserServiceTest.java
+++ b/src/test/java/de/ozgcloud/admin/common/user/CurrentUserServiceTest.java
@@ -25,43 +25,32 @@ package de.ozgcloud.admin.common.user;
 
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Nested;
-import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
 import org.mockito.MockedStatic;
 import org.mockito.Mockito;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
-public class CurrentUserServiceTest {
+class CurrentUserServiceTest {
 	private final CurrentUserService currentUserService = new CurrentUserService();
 
 	@DisplayName("Has role")
 	@Nested
 	class TestHasRole {
-		@Test
-		void shouldNotHaveRole() {
+		@ParameterizedTest
+		@ValueSource(booleans = {false, true})
+		void shouldReturnValue(boolean hasRoleValue) {
 			try (MockedStatic<CurrentUserHelper> mockUserHelper = Mockito.mockStatic(
 					CurrentUserHelper.class)
 			){
 				mockUserHelper.when(() -> CurrentUserHelper.hasRole(Mockito.anyString()))
-						.thenReturn(false);
+						.thenReturn(hasRoleValue);
 
 				boolean hasRole = currentUserService.hasRole(UserRole.ADMIN_USER);
 
-				assertThat(hasRole).isFalse();
-			}
-		}
-
-		@Test
-		void shouldHaveRole() {
-			try (MockedStatic<CurrentUserHelper> mockUserHelper = Mockito.mockStatic(
-					CurrentUserHelper.class)
-			){
-				mockUserHelper.when(() -> CurrentUserHelper.hasRole(Mockito.anyString()))
-						.thenReturn(true);
-
-				boolean hasRole = currentUserService.hasRole(UserRole.ADMIN_USER);
-
-				assertThat(hasRole).isTrue();
+				mockUserHelper.verify(() -> CurrentUserHelper.hasRole(UserRole.ADMIN_USER));
+				assertThat(hasRole).isEqualTo(hasRoleValue);
 			}
 		}
 	}