diff --git a/airports-flight-service/src/test/java/cz/muni/fi/pa165/service/FlightRealizationServiceTest.java b/airports-flight-service/src/test/java/cz/muni/fi/pa165/service/FlightRealizationServiceTest.java
index 472c44ec700c8a0d069defa4d342875fcd7272aa..3cae69527725b456c818d6bcaf51249730204898 100644
--- a/airports-flight-service/src/test/java/cz/muni/fi/pa165/service/FlightRealizationServiceTest.java
+++ b/airports-flight-service/src/test/java/cz/muni/fi/pa165/service/FlightRealizationServiceTest.java
@@ -1,16 +1,27 @@
 package cz.muni.fi.pa165.service;
 
+import cz.muni.fi.pa165.dao.Flight;
 import cz.muni.fi.pa165.dao.FlightRealization;
+import cz.muni.fi.pa165.exception.FlightNotFoundException;
 import cz.muni.fi.pa165.exception.FlightRealizationNotFoundException;
 import cz.muni.fi.pa165.repository.FlightRealizationRepository;
 import cz.muni.fi.pa165.repository.FlightRepository;
+import cz.muni.fi.pa165.utils.TestDaoFactory;
+import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.mockito.InjectMocks;
 import org.mockito.Mock;
+import org.mockito.Mockito;
 import org.mockito.junit.jupiter.MockitoExtension;
 
+import java.time.Duration;
 import java.util.List;
+import java.util.Optional;
+import java.util.UUID;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
 
 @ExtendWith(MockitoExtension.class)
 public class FlightRealizationServiceTest {
@@ -21,27 +32,87 @@ public class FlightRealizationServiceTest {
     private FlightRealizationService flightRealizationService;
 
     @Test
-    public void getAllFlightRealizations() {
+    public void getFlightRealization_flightRealizationFound_returnsFlight() {
+        // Prepare a sample flight ID
+        UUID id = UUID.randomUUID();
+
+        // Create a sample flight object
+        FlightRealization flight = TestDaoFactory.getflightRealizationEntity();
+
+        // Mocking the behavior of the flightRepository.findById() method
+        Mockito.when(flightRealizationRepository.findById(id)).thenReturn(Optional.of(flight));
 
+        // Calling the method to be tested
+        FlightRealization foundFlight = flightRealizationService.getFlightRealizationById(id);
+
+        // Assertions
+        Assertions.assertEquals(foundFlight, flight); // Check if the returned flight matches the one we created
     }
 
     @Test
-    public void getFlightRealizationById() {
+    void getById_flightRealizationNotFound_throwsResourceNotFoundException() {
+        // Prepare a random non-existent flight ID
+        UUID id = UUID.randomUUID();
+
+        // Mock the behavior of the flightRepository.findById() method to return an empty Optional
+        Mockito.when(flightRealizationRepository.findById(id)).thenReturn(Optional.empty());
 
+        // Assert that calling flightService.getFlight(id) should throw FlightNotFoundException
+        assertThrows(FlightRealizationNotFoundException.class, () -> flightRealizationService.getFlightRealizationById(id));
     }
 
+
     @Test
-    public void createFlightRealization() {
+    void createFlightRealization() {
+        // Create a sample flight object
+        FlightRealization flight = TestDaoFactory.getflightRealizationEntity();
+
+        // Mocking the behavior of the flightRepository.save() method
+        Mockito.when(flightRealizationRepository.save(flight)).thenReturn(flight);
 
+        // Calling the method to be tested
+        FlightRealization createdFlight = flightRealizationService.createFlightRealization(flight);
+
+        // Assertions
+        assertEquals(flight, createdFlight); // Check if returned flight matches the one we created
+        Mockito.verify(flightRealizationRepository, Mockito.times(1)).save(flight); // Verify that save method was called exactly once with the correct parameter
     }
 
     @Test
-    public void updateFlightRealization() {
+    void updateFlightRealization_flightRealizationNotFound_throwsFlightRealizationNotFoundException() {
+        UUID id = UUID.randomUUID(); // Generate a random flight ID
+        FlightRealization update = new FlightRealization(); // Prepare an update object
+
+        // Assert that calling flightService.updateFlight(id, update) should throw FlightNotFoundException
+        assertThrows(FlightRealizationNotFoundException.class, () -> flightRealizationService.updateFlightRealization(id, update));
 
+        // Verify that stewardRepository.save() was not called
+        Mockito.verify(flightRealizationRepository, Mockito.times(0)).save(Mockito.any());
     }
 
+
     @Test
-    public void deleteFlightRealization() {
+    void updateFlightRealization_flightFound() {
+        UUID id = UUID.randomUUID();
+
+        FlightRealization existingFlight = TestDaoFactory.getflightRealizationEntity();
+        existingFlight.setId(id);
+
+        FlightRealization update = new FlightRealization();
+        update.setDuration(Duration.ofHours(2));
+
+        FlightRealization updatedFlight = TestDaoFactory.getflightRealizationEntity();
+
+        updatedFlight.setId(id);
+        updatedFlight.setDuration(Duration.ofHours(2));
+
+        Mockito.when(flightRealizationRepository.findById(id)).thenReturn(Optional.of(existingFlight));
+
+        Mockito.when(flightRealizationRepository.save(Mockito.any(FlightRealization.class))).thenReturn(updatedFlight);
+
+        FlightRealization returnedFlight = flightRealizationService.updateFlightRealization(id, update);
 
+        assertEquals(updatedFlight, returnedFlight);
+        Mockito.verify(flightRealizationRepository, Mockito.times(1)).save(updatedFlight);
     }
 }
diff --git a/airports-flight-service/src/test/java/cz/muni/fi/pa165/utils/TestApiFactory.java b/airports-flight-service/src/test/java/cz/muni/fi/pa165/utils/TestApiFactory.java
index a478f64ba714b9c64b07ef6a48ca9dbb37d1a2ec..d3e5940f6a6dcc4014ecb1bcbe5badaa9d9ae1b1 100644
--- a/airports-flight-service/src/test/java/cz/muni/fi/pa165/utils/TestApiFactory.java
+++ b/airports-flight-service/src/test/java/cz/muni/fi/pa165/utils/TestApiFactory.java
@@ -24,7 +24,7 @@ public class TestApiFactory {
     }
 
 
-    public static FlightRealization getflightRealizationEntity() {
+    public static FlightRealization getFlightRealizationEntity() {
         UUID id = new UUID(0x1, 0xf);
         FlightRealization flightRealization = new FlightRealization();
         flightRealization.setDepartureTime(LocalDateTime.now());