diff --git a/src/main/java/com/example/roommate/application/services/AdminApplicationService.java b/src/main/java/com/example/roommate/application/services/AdminApplicationService.java
index 80c164ba..e7dd57ee 100644
--- a/src/main/java/com/example/roommate/application/services/AdminApplicationService.java
+++ b/src/main/java/com/example/roommate/application/services/AdminApplicationService.java
@@ -2,7 +2,8 @@
 
 import com.example.roommate.annotations.ApplicationService;
 import com.example.roommate.application.data.RoomApplicationData;
-import com.example.roommate.domain.services.RoomDomainService;
+import com.example.roommate.interfaces.application.services.IAdminApplicationService;
+import com.example.roommate.interfaces.domain.services.IRoomDomainService;
 import com.example.roommate.values.domainValues.RoomNumber;
 import com.example.roommate.values.forms.RoomDataForm;
 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
@@ -12,11 +13,11 @@
 @SuppressFBWarnings(value="EI2", justification="RoomDomainService is properly injected")
 @ApplicationService
 
-public class AdminApplicationService {
+public class AdminApplicationService implements IAdminApplicationService {
 
-    final RoomDomainService roomDomainService;
+    final IRoomDomainService roomDomainService;
 
-    public AdminApplicationService(RoomDomainService roomDomainService) {
+    public AdminApplicationService(IRoomDomainService roomDomainService) {
         this.roomDomainService = roomDomainService;
     }
 
diff --git a/src/main/java/com/example/roommate/application/services/BookingApplicationService.java b/src/main/java/com/example/roommate/application/services/BookingApplicationService.java
index 402e2bd8..39949ab3 100644
--- a/src/main/java/com/example/roommate/application/services/BookingApplicationService.java
+++ b/src/main/java/com/example/roommate/application/services/BookingApplicationService.java
@@ -3,6 +3,7 @@
 import com.example.roommate.annotations.ApplicationService;
 import com.example.roommate.application.data.RoomApplicationData;
 import com.example.roommate.exceptions.domainService.GeneralDomainException;
+import com.example.roommate.interfaces.application.services.IBookingApplicationService;
 import com.example.roommate.utility.IterableSupport;
 import com.example.roommate.values.domainValues.BookedTimeframe;
 import com.example.roommate.values.domainValues.IntermediateBookDataForm;
@@ -24,7 +25,7 @@
 import java.time.DayOfWeek;
 @ApplicationService
 @SuppressFBWarnings(value="EI2", justification="RoomDomainService is properly injected")
-public class BookingApplicationService {
+public class BookingApplicationService implements IBookingApplicationService {
 
     RoomDomainService roomDomainService;
 
diff --git a/src/main/java/com/example/roommate/controller/HomeController.java b/src/main/java/com/example/roommate/controller/HomeController.java
index 2524d1dc..ec2255e8 100644
--- a/src/main/java/com/example/roommate/controller/HomeController.java
+++ b/src/main/java/com/example/roommate/controller/HomeController.java
@@ -1,6 +1,6 @@
 package com.example.roommate.controller;
 
-import com.example.roommate.application.services.BookingApplicationService;
+import com.example.roommate.interfaces.application.services.IBookingApplicationService;
 import com.example.roommate.utility.IterableSupport;
 import com.example.roommate.values.domainValues.DayTimeFrame;
 import com.example.roommate.values.models.RoomHomeModel;
@@ -16,9 +16,9 @@
 @Controller()
 @SuppressFBWarnings(value="EI2", justification="BookingApplicationService is properly injected")
 public class HomeController {
-    private final BookingApplicationService bookingApplicationService;
+    private final IBookingApplicationService bookingApplicationService;
     @Autowired
-    public HomeController(BookingApplicationService bookingApplicationService) {
+    public HomeController(IBookingApplicationService bookingApplicationService) {
         this.bookingApplicationService = bookingApplicationService;
     }
 
diff --git a/src/main/java/com/example/roommate/controller/RoomController.java b/src/main/java/com/example/roommate/controller/RoomController.java
index cbd0b39f..50f8e79f 100644
--- a/src/main/java/com/example/roommate/controller/RoomController.java
+++ b/src/main/java/com/example/roommate/controller/RoomController.java
@@ -1,16 +1,16 @@
 package com.example.roommate.controller;
 
 import com.example.roommate.annotations.AdminOnly;
-import com.example.roommate.application.services.AdminApplicationService;
 import com.example.roommate.exceptions.ArgumentValidationException;
 import com.example.roommate.exceptions.persistence.NotFoundRepositoryException;
+import com.example.roommate.interfaces.application.services.IAdminApplicationService;
+import com.example.roommate.interfaces.application.services.IBookingApplicationService;
 import com.example.roommate.utility.IterableSupport;
 import com.example.roommate.values.domainValues.*;
 import com.example.roommate.exceptions.applicationService.NotFoundException;
 import com.example.roommate.interfaces.entities.IRoom;
 import com.example.roommate.exceptions.domainService.GeneralDomainException;
 import com.example.roommate.values.forms.BookDataForm;
-import com.example.roommate.application.services.BookingApplicationService;
 import com.example.roommate.values.forms.RoomDataForm;
 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
 import jakarta.validation.Valid;
@@ -30,12 +30,12 @@
 @SuppressFBWarnings(value="EI2", justification="BookingApplicationService & AdminApplicationService are properly injected")
 public class RoomController {
 
-    private final BookingApplicationService bookingApplicationService;
+    private final IBookingApplicationService bookingApplicationService;
 
-    private final AdminApplicationService adminApplicationService;
+    private final IAdminApplicationService adminApplicationService;
 
     @Autowired
-    public RoomController(BookingApplicationService bookingApplicationService, AdminApplicationService adminApplicationService) {
+    public RoomController(IBookingApplicationService bookingApplicationService, IAdminApplicationService adminApplicationService) {
         this.bookingApplicationService = bookingApplicationService;
         this.adminApplicationService = adminApplicationService;
     }
diff --git a/src/main/java/com/example/roommate/domain/services/RoomDomainService.java b/src/main/java/com/example/roommate/domain/services/RoomDomainService.java
index ff064cdc..7d7d662a 100644
--- a/src/main/java/com/example/roommate/domain/services/RoomDomainService.java
+++ b/src/main/java/com/example/roommate/domain/services/RoomDomainService.java
@@ -2,6 +2,7 @@
 
 import com.example.roommate.annotations.DomainService;
 import com.example.roommate.application.data.RoomApplicationData;
+import com.example.roommate.interfaces.domain.services.IRoomDomainService;
 import com.example.roommate.interfaces.entities.IRoom;
 import com.example.roommate.interfaces.repositories.IItemRepository;
 import com.example.roommate.interfaces.repositories.IRoomRepository;
@@ -23,7 +24,7 @@
 @DomainService
 //mediate between Repository, domain; map forms to domain-objects/data
 @SuppressFBWarnings(value="EI2", justification="Repositories are properly injected, @Lazy self is required for transactions")
-public class RoomDomainService {
+public class RoomDomainService implements IRoomDomainService {
 
     IRoomRepository roomRepository;
     IItemRepository itemRepository;
@@ -35,10 +36,10 @@ public RoomDomainService(IRoomRepository roomRepository, IItemRepository itemRep
         this.self = this;
     }
     @Autowired
-    public RoomDomainService(IRoomRepository roomRepository, IItemRepository itemRepository, @Lazy RoomDomainService self) {
+    public RoomDomainService(IRoomRepository roomRepository, IItemRepository itemRepository, @Lazy IRoomDomainService self) {
         this.roomRepository = roomRepository;
         this.itemRepository = itemRepository;
-        this.self = self;
+        this.self = (RoomDomainService) self;
     }
 
     public void addDummyDummy(){
diff --git a/src/main/java/com/example/roommate/interfaces/application/services/IAdminApplicationService.java b/src/main/java/com/example/roommate/interfaces/application/services/IAdminApplicationService.java
new file mode 100644
index 00000000..ee3cde8e
--- /dev/null
+++ b/src/main/java/com/example/roommate/interfaces/application/services/IAdminApplicationService.java
@@ -0,0 +1,7 @@
+package com.example.roommate.interfaces.application.services;
+
+import com.example.roommate.values.forms.RoomDataForm;
+
+public interface IAdminApplicationService {
+    void addRoom(RoomDataForm roomDataForm);
+}
diff --git a/src/main/java/com/example/roommate/interfaces/application/services/IBookingApplicationService.java b/src/main/java/com/example/roommate/interfaces/application/services/IBookingApplicationService.java
new file mode 100644
index 00000000..7dd3caea
--- /dev/null
+++ b/src/main/java/com/example/roommate/interfaces/application/services/IBookingApplicationService.java
@@ -0,0 +1,25 @@
+package com.example.roommate.interfaces.application.services;
+
+import com.example.roommate.exceptions.applicationService.NotFoundException;
+import com.example.roommate.exceptions.domainService.GeneralDomainException;
+import com.example.roommate.exceptions.persistence.NotFoundRepositoryException;
+import com.example.roommate.interfaces.entities.IRoom;
+import com.example.roommate.values.domainValues.IntermediateBookDataForm;
+import com.example.roommate.values.domainValues.ItemName;
+import com.example.roommate.values.models.RoomBookingModel;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.UUID;
+
+public interface IBookingApplicationService {
+    void addBookEntry(IntermediateBookDataForm form) throws NotFoundException, GeneralDomainException;
+    Collection<ItemName> getItems();
+    Collection<IRoom> getRooms();
+    void addRoom(IRoom room);
+    IRoom findRoomByID(UUID roomID) throws NotFoundException;
+    List<RoomBookingModel> findAvailableRoomsWithItems(List<ItemName> items, String dateString, String startTimeString, String endTimeString);
+    void removeItemFromRoom(UUID roomID, String itemName) throws NotFoundRepositoryException;
+    void addItemToRoom(UUID roomID, String itemName) throws NotFoundRepositoryException;
+    void createItem(String itemName);
+}
diff --git a/src/main/java/com/example/roommate/interfaces/domain/services/IRoomDomainService.java b/src/main/java/com/example/roommate/interfaces/domain/services/IRoomDomainService.java
new file mode 100644
index 00000000..a12139ae
--- /dev/null
+++ b/src/main/java/com/example/roommate/interfaces/domain/services/IRoomDomainService.java
@@ -0,0 +1,23 @@
+package com.example.roommate.interfaces.domain.services;
+
+import com.example.roommate.application.data.RoomApplicationData;
+import com.example.roommate.exceptions.persistence.NotFoundRepositoryException;
+import com.example.roommate.interfaces.entities.IRoom;
+import com.example.roommate.values.domainValues.BookedTimeframe;
+import com.example.roommate.values.domainValues.ItemName;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.UUID;
+
+public interface IRoomDomainService {
+    void addBooking(BookedTimeframe bookedTimeframe, UUID roomID) throws NotFoundRepositoryException;
+    void addRoom(RoomApplicationData roomApplicationData);
+    void removeRoom(RoomApplicationData room);
+    Collection<IRoom> getRooms();
+    IRoom findRoomByID(UUID roomID) throws NotFoundRepositoryException;
+    List<ItemName> getItems();
+    void removeItemFromRoom(UUID roomID, String itemName) throws NotFoundRepositoryException;
+    void addItemToRoom(UUID roomID, String itemName) throws NotFoundRepositoryException;
+    void createItem(String itemName);
+}
diff --git a/src/test/java/com/example/roommate/stubs/AdminApplicationServiceDummy.java b/src/test/java/com/example/roommate/stubs/AdminApplicationServiceDummy.java
new file mode 100644
index 00000000..6dc7b6d6
--- /dev/null
+++ b/src/test/java/com/example/roommate/stubs/AdminApplicationServiceDummy.java
@@ -0,0 +1,11 @@
+package com.example.roommate.stubs;
+
+import com.example.roommate.interfaces.application.services.IAdminApplicationService;
+import com.example.roommate.values.forms.RoomDataForm;
+
+public class AdminApplicationServiceDummy implements IAdminApplicationService {
+    @Override
+    public void addRoom(RoomDataForm roomDataForm) {
+        
+    }
+}
diff --git a/src/test/java/com/example/roommate/stubs/BookingApplicationServiceDummy.java b/src/test/java/com/example/roommate/stubs/BookingApplicationServiceDummy.java
new file mode 100644
index 00000000..4466fb06
--- /dev/null
+++ b/src/test/java/com/example/roommate/stubs/BookingApplicationServiceDummy.java
@@ -0,0 +1,61 @@
+package com.example.roommate.stubs;
+
+import com.example.roommate.exceptions.applicationService.NotFoundException;
+import com.example.roommate.exceptions.domainService.GeneralDomainException;
+import com.example.roommate.exceptions.persistence.NotFoundRepositoryException;
+import com.example.roommate.interfaces.application.services.IBookingApplicationService;
+import com.example.roommate.interfaces.entities.IRoom;
+import com.example.roommate.values.domainValues.IntermediateBookDataForm;
+import com.example.roommate.values.domainValues.ItemName;
+import com.example.roommate.values.models.RoomBookingModel;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.UUID;
+
+public class BookingApplicationServiceDummy implements IBookingApplicationService {
+    @Override
+    public void addBookEntry(IntermediateBookDataForm form) throws NotFoundException, GeneralDomainException {
+        
+    }
+
+    @Override
+    public Collection<ItemName> getItems() {
+        return null;
+    }
+
+    @Override
+    public Collection<IRoom> getRooms() {
+        return null;
+    }
+
+    @Override
+    public void addRoom(IRoom room) {
+
+    }
+
+    @Override
+    public IRoom findRoomByID(UUID roomID) throws NotFoundException {
+        return null;
+    }
+
+    @Override
+    public List<RoomBookingModel> findAvailableRoomsWithItems(List<ItemName> items, String dateString, String startTimeString, String endTimeString) {
+        return null;
+    }
+
+    @Override
+    public void removeItemFromRoom(UUID roomID, String itemName) throws NotFoundRepositoryException {
+
+    }
+
+    @Override
+    public void addItemToRoom(UUID roomID, String itemName) throws NotFoundRepositoryException {
+
+    }
+
+    @Override
+    public void createItem(String itemName) {
+
+    }
+}
diff --git a/src/test/java/com/example/roommate/stubs/RoomDomainServiceDummy.java b/src/test/java/com/example/roommate/stubs/RoomDomainServiceDummy.java
new file mode 100644
index 00000000..1576a205
--- /dev/null
+++ b/src/test/java/com/example/roommate/stubs/RoomDomainServiceDummy.java
@@ -0,0 +1,59 @@
+package com.example.roommate.stubs;
+
+import com.example.roommate.application.data.RoomApplicationData;
+import com.example.roommate.exceptions.persistence.NotFoundRepositoryException;
+import com.example.roommate.interfaces.domain.services.IRoomDomainService;
+import com.example.roommate.interfaces.entities.IRoom;
+import com.example.roommate.values.domainValues.BookedTimeframe;
+import com.example.roommate.values.domainValues.ItemName;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.UUID;
+
+public class RoomDomainServiceDummy implements IRoomDomainService {
+    @Override
+    public void addBooking(BookedTimeframe bookedTimeframe, UUID roomID) throws NotFoundRepositoryException {
+        
+    }
+
+    @Override
+    public void addRoom(RoomApplicationData roomApplicationData) {
+
+    }
+
+    @Override
+    public void removeRoom(RoomApplicationData room) {
+
+    }
+
+    @Override
+    public Collection<IRoom> getRooms() {
+        return null;
+    }
+
+    @Override
+    public IRoom findRoomByID(UUID roomID) throws NotFoundRepositoryException {
+        return null;
+    }
+
+    @Override
+    public List<ItemName> getItems() {
+        return null;
+    }
+
+    @Override
+    public void removeItemFromRoom(UUID roomID, String itemName) throws NotFoundRepositoryException {
+
+    }
+
+    @Override
+    public void addItemToRoom(UUID roomID, String itemName) throws NotFoundRepositoryException {
+
+    }
+
+    @Override
+    public void createItem(String itemName) {
+
+    }
+}
diff --git a/src/test/java/com/example/roommate/tests/controller/booking/GetBookTest.java b/src/test/java/com/example/roommate/tests/controller/booking/GetBookTest.java
index 21e1ace9..1966b15d 100644
--- a/src/test/java/com/example/roommate/tests/controller/booking/GetBookTest.java
+++ b/src/test/java/com/example/roommate/tests/controller/booking/GetBookTest.java
@@ -2,21 +2,35 @@
 
 import com.example.roommate.annotations.TestClass;
 import com.example.roommate.annotations.WithMockOAuth2User;
+import com.example.roommate.application.services.AdminApplicationService;
+import com.example.roommate.application.services.BookingApplicationService;
+import com.example.roommate.controller.RoomController;
+import com.example.roommate.interfaces.application.services.IAdminApplicationService;
+import com.example.roommate.interfaces.application.services.IBookingApplicationService;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
+import org.springframework.boot.test.mock.mockito.MockBean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.FilterType;
 import org.springframework.test.web.servlet.MockMvc;
 
 import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.*;
 
-@WebMvcTest
+@WebMvcTest(controllers = {RoomController.class}, excludeFilters = @ComponentScan.Filter(type = FilterType.ASSIGNABLE_TYPE, value = {AdminApplicationService.class, BookingApplicationService.class}))
 @TestClass
 public class GetBookTest {
 
     @Autowired
     MockMvc mvc;
+    
+    @MockBean
+    IAdminApplicationService adminApplicationService;
+
+    @MockBean
+    IBookingApplicationService bookingApplicationService;
 
     @Test
     @DisplayName("A Get-Request on /book returns home.html")