diff --git a/backend/tests/data/teacher-invitation.test.ts b/backend/tests/data/teacher-invitation.test.ts
new file mode 100644
index 00000000..e075ee46
--- /dev/null
+++ b/backend/tests/data/teacher-invitation.test.ts
@@ -0,0 +1,64 @@
+import { beforeAll, describe, expect, it } from 'vitest';
+import { setupTestApp } from '../setup-tests';
+import {
+    getClassRepository,
+    getTeacherInvitationRepository,
+    getTeacherRepository,
+} from '../../src/data/repositories';
+import { TeacherInvitationRepository } from '../../src/data/classes/teacher-invitation-repository';
+import { TeacherRepository } from '../../src/data/users/teacher-repository';
+import { ClassRepository } from '../../src/data/classes/class-repository';
+
+describe('ClassRepository', () => {
+    let TeacherInvitationRepository: TeacherInvitationRepository;
+    let TeacherRepository: TeacherRepository;
+    let ClassRepository: ClassRepository;
+
+    beforeAll(async () => {
+        await setupTestApp();
+        TeacherInvitationRepository = getTeacherInvitationRepository();
+        TeacherRepository = getTeacherRepository();
+        ClassRepository = getClassRepository();
+    });
+
+    it('should return all invitations from a teacher', async () => {
+        const teacher = await TeacherRepository.findByUsername('LimpBizkit');
+        const invitations =
+            await TeacherInvitationRepository.findAllInvitationsBy(teacher!);
+
+        expect(invitations).toBeTruthy();
+        expect(invitations).toHaveLength(2);
+    });
+
+    it('should return all invitations for a teacher', async () => {
+        const teacher = await TeacherRepository.findByUsername('FooFighters');
+        const invitations =
+            await TeacherInvitationRepository.findAllInvitationsFor(teacher!);
+
+        expect(invitations).toBeTruthy();
+        expect(invitations).toHaveLength(2);
+    });
+
+    it('should return all invitations for a class', async () => {
+        const class_ = await ClassRepository.findById('id02');
+        const invitations =
+            await TeacherInvitationRepository.findAllInvitationsForClass(
+                class_!
+            );
+
+        expect(invitations).toBeTruthy();
+        expect(invitations).toHaveLength(2);
+    });
+
+    it('should not find a removed invitation', async () => {
+        const class_ = await ClassRepository.findById('id01');
+        const sender = await TeacherRepository.findByUsername('FooFighters');
+        const receiver = await TeacherRepository.findByUsername('LimpBizkit');
+        await TeacherInvitationRepository.deleteBy(class_!, sender!, receiver!);
+
+        const invitation =
+            await TeacherInvitationRepository.findAllInvitationsBy(sender!);
+
+        expect(invitation).toHaveLength(0);
+    });
+});
diff --git a/backend/tests/setup-tests.ts b/backend/tests/setup-tests.ts
index dc016150..c9d31786 100644
--- a/backend/tests/setup-tests.ts
+++ b/backend/tests/setup-tests.ts
@@ -81,7 +81,7 @@ export async function setupTestApp() {
     });
 
     const teacher02 = em.create(Teacher, {
-        username: 'LimppBizkit',
+        username: 'LimpBizkit',
         firstName: 'Fred',
         lastName: 'Durst',
     });
@@ -421,29 +421,29 @@ export async function setupTestApp() {
     // assignment01.groups.push(group03);
     // assignment02.groups.push(group04);
 
-    // const teacher_invitation01 = em.create(TeacherInvitation, {
-    //     sender: teacher02,
-    //     receiver: teacher01,
-    //     class: class02,
-    // });
+    const teacherInvitation01 = em.create(TeacherInvitation, {
+        sender: teacher02,
+        receiver: teacher01,
+        class: class02,
+    });
 
-    // const teacher_invitation02 = em.create(TeacherInvitation, {
-    //     sender: teacher02,
-    //     receiver: teacher03,
-    //     class: class02,
-    // });
+    const teacherInvitation02 = em.create(TeacherInvitation, {
+        sender: teacher02,
+        receiver: teacher03,
+        class: class02,
+    });
 
-    // const teacher_invitation03 = em.create(TeacherInvitation, {
-    //     sender: teacher03,
-    //     receiver: teacher01,
-    //     class: class03,
-    // });
+    const teacherInvitation03 = em.create(TeacherInvitation, {
+        sender: teacher03,
+        receiver: teacher01,
+        class: class03,
+    });
 
-    // const teacher_invitation04 = em.create(TeacherInvitation, {
-    //     sender: teacher01,
-    //     receiver: teacher02,
-    //     class: class01,
-    // });
+    const teacherInvitation04 = em.create(TeacherInvitation, {
+        sender: teacher01,
+        receiver: teacher02,
+        class: class01,
+    });
 
     const classJoinRequest01 = em.create(ClassJoinRequest, {
         requester: student05,
@@ -622,5 +622,9 @@ export async function setupTestApp() {
         classJoinRequest02,
         classJoinRequest03,
         classJoinRequest04,
+        teacherInvitation01,
+        teacherInvitation02,
+        teacherInvitation03,
+        teacherInvitation04,
     ]);
 }