diff --git a/src/test/java/se/iths/java24/spring25/service/JobOpportunityServiceTest.java b/src/test/java/se/iths/java24/spring25/service/JobOpportunityServiceTest.java
new file mode 100644
index 0000000..e0fe335
--- /dev/null
+++ b/src/test/java/se/iths/java24/spring25/service/JobOpportunityServiceTest.java
@@ -0,0 +1,104 @@
+package se.iths.java24.spring25.service;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import se.iths.java24.spring25.entity.JobOpportunityEntity;
+import se.iths.java24.spring25.repository.JobOpportunityRepository;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Optional;
+
+import static org.assertj.core.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
+public class JobOpportunityServiceTest {
+
+    private JobOpportunityRepository repository;
+    private JobOpportunityService service;
+
+    @BeforeEach
+    void setUp() {
+        repository = mock(JobOpportunityRepository.class);
+        service = new JobOpportunityService(repository);
+    }
+
+    @Test
+    void shouldReturnAllJobOpportunities() {
+        JobOpportunityEntity job1 = new JobOpportunityEntity("Company A", "Dev", "Build stuff", "Gbg", "Full-time");
+        JobOpportunityEntity job2 = new JobOpportunityEntity("Company B", "Tester", "Break Stuff", "Malmö", "Part-time");
+
+        when(repository.findAll()).thenReturn(Arrays.asList(job1, job2));
+
+        List<JobOpportunityEntity> result = service.getAllJobOpportunities();
+
+        assertThat(result).hasSize(2).contains(job1, job2);
+    }
+
+    @Test
+    void shouldReturnJobOpportunityById() {
+        JobOpportunityEntity job = new JobOpportunityEntity("Company", "Dev", "Code", "Gbg", "Full-time");
+
+        // Mockar repository så att findById returnerar ett Optional med vårt jobb
+        when(repository.findById(1L)).thenReturn(Optional.of(job));
+
+        // Anrop till service-metoden
+        Optional<JobOpportunityEntity> result = service.getJobOpportunityById(1L);
+
+        // Verifiera att det returnerade resultatet inte är tomt och innehåller vårt jobb
+        assertThat(result).isPresent().contains(job);
+    }
+
+
+    @Test
+    void shouldSaveNewJobOpportunity() {
+        JobOpportunityEntity job = new JobOpportunityEntity("Company", "Dev", "Code", "Gbg", "Full-time");
+
+        when(repository.save(job)).thenReturn(job);
+
+        JobOpportunityEntity result = service.createJobOpportunity(job);
+
+        assertThat(result).isEqualTo(job);
+    }
+
+    @Test
+    void shouldDeleteJobOpportunity() {
+        service.deleteJobOpportunity(42L);
+        verify(repository).deleteById(42L);
+    }
+
+    @Test
+    void shouldThrowExceptionWhenMissingCompanyName() {
+        assertThatThrownBy(() -> service.registerNewJob("", "Title", "Desc", "Loc", "Terms"))
+                .isInstanceOf(IllegalArgumentException.class)
+                .hasMessageContaining("Name");
+    }
+
+    @Test
+    void shouldThrowExceptionWhenMissingJobTitle() {
+        assertThatThrownBy(() -> service.registerNewJob("Company", "", "Desc", "Loc", "Terms"))
+                .isInstanceOf(IllegalArgumentException.class)
+                .hasMessageContaining("Jobtitle");
+    }
+
+    @Test
+    void shouldThrowExceptionWhenMissingJobDescription() {
+        assertThatThrownBy(() -> service.registerNewJob("Company", "Title", "", "Loc", "Terms"))
+                .isInstanceOf(IllegalArgumentException.class)
+                .hasMessageContaining("Job description");
+    }
+
+    @Test
+    void shouldThrowExceptionWhenMissingLocation() {
+        assertThatThrownBy(() -> service.registerNewJob("Company", "Title", "Desc", "", "Terms"))
+                .isInstanceOf(IllegalArgumentException.class)
+                .hasMessageContaining("Location");
+    }
+
+    @Test
+    void shouldThrowExceptionWhenMissingTermsOfEmployment() {
+        assertThatThrownBy(() -> service.registerNewJob("Company", "Title", "Desc", "Loc", ""))
+                .isInstanceOf(IllegalArgumentException.class)
+                .hasMessageContaining("Terms Of Employment");
+    }
+}
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