diff --git a/README.md b/README.md
index d1a8e3c..fd52f90 100644
--- a/README.md
+++ b/README.md
@@ -78,6 +78,7 @@ For run tests:
 **Relationships**
 | Method | Endpoint              | Description                                    |
 |--------|-----------------------|------------------------------------------------|
+| GET    | `/relationships`      | Retrieve a list of all relationships           |
 | POST   | `/relationships`      | Add author-book relationship                   |
 | DELETE | `/relationships`      | Remove author-book relationship                |
 
diff --git a/docker-compose.yml b/docker-compose.yml
index d0b12e6..7b288fb 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -23,7 +23,7 @@ services:
   tests:
     container_name: tests
     build: .
-    command: bash -c "pytest tests/test_authors.py"
+    command: bash -c "pytest tests"
     volumes:
       - .:/code
     depends_on:
diff --git a/library_service/routers/relationships.py b/library_service/routers/relationships.py
index 4324c0a..bdbf8e4 100644
--- a/library_service/routers/relationships.py
+++ b/library_service/routers/relationships.py
@@ -6,10 +6,10 @@ from library_service.settings import get_session
 from library_service.models.db import Book, Author, AuthorBookLink
 from library_service.models.dto import AuthorRead, BookRead
 
-router = APIRouter(prefix="/relationships", tags=["relations"])
+router = APIRouter(tags=["relations"])
 
 # Add author to book
-@router.post("/", response_model=AuthorBookLink)
+@router.post("/relationships", response_model=AuthorBookLink)
 def add_author_to_book(author_id: int, book_id: int, session: Session = Depends(get_session)):
     author = session.get(Author, author_id)
     if not author:
@@ -35,7 +35,7 @@ def add_author_to_book(author_id: int, book_id: int, session: Session = Depends(
     return link
 
 # Remove author from book
-@router.delete("/", response_model=Dict[str, str])
+@router.delete("/relationships", response_model=Dict[str, str])
 def remove_author_from_book(author_id: int, book_id: int, session: Session = Depends(get_session)):
     link = session.exec(
         select(AuthorBookLink)
@@ -50,6 +50,12 @@ def remove_author_from_book(author_id: int, book_id: int, session: Session = Dep
     session.commit()
     return {"message": "Relationship removed successfully"}
 
+# Get relationships
+@router.get("/relationships", response_model=List[AuthorBookLink])
+def get_relationships(session: Session = Depends(get_session)):
+    relationships = session.exec(select(AuthorBookLink)).all()
+    return relationships
+
 # Get author's books
 @router.get("/authors/{author_id}/books/", response_model=List[BookRead])
 def get_books_for_author(author_id: int, session: Session = Depends(get_session)):
diff --git a/tests/test_authors.py b/tests/test_authors.py
index ff58a08..35d9447 100644
--- a/tests/test_authors.py
+++ b/tests/test_authors.py
@@ -33,7 +33,7 @@ def test_get_existing_author(setup_database):
     response = client.get("/authors/1")
     print(response.json())
     assert response.status_code == 200, "Invalid response status"
-    assert response.json() == {"id": 1, "name": "Test Author"}, "Invalid response data"
+    assert response.json() == {"id": 1, "name": "Test Author", "books": []}, "Invalid response data"
 
 def test_get_not_existing_author(setup_database):
     response = client.get("/authors/2")
diff --git a/tests/test_relationships.py b/tests/test_relationships.py
index e15defe..03d99e2 100644
--- a/tests/test_relationships.py
+++ b/tests/test_relationships.py
@@ -9,4 +9,71 @@ from tests.test_misc import setup_database
 
 client = TestClient(app)
 
-#TODO: add tests for relationships endpoints
+def make_relationship(author_id, book_id):
+    response = client.post("/relationships", params={"author_id": author_id, "book_id": book_id})
+    assert response.status_code == 200, "Invalid response status"
+
+def test_prepare_data(setup_database):
+    response = client.post("/books", json={"title": "Test Book 1", "description": "Test Description 1"})
+    response = client.post("/books", json={"title": "Test Book 2", "description": "Test Description 2"})
+    response = client.post("/books", json={"title": "Test Book 3", "description": "Test Description 3"})
+
+    response = client.post("/authors", json={"name": "Test Author 1"})
+    response = client.post("/authors", json={"name": "Test Author 2"})
+    response = client.post("/authors", json={"name": "Test Author 3"})
+
+    make_relationship(1, 1)
+    make_relationship(2, 1)
+    make_relationship(1, 2)
+    make_relationship(2, 3)
+    make_relationship(3, 3)
+
+    response = client.get("/relationships")
+    assert response.status_code == 200, "Invalid response status"
+    assert len(response.json()) == 5, "Invalid number of relationships"
+
+def test_get_book_authors():
+    response1 = client.get("/books/1/authors")
+    assert response1.status_code == 200, "Invalid response status"
+    assert len(response1.json()) == 2, "Invalid number of authors"
+    assert response1.json()[0]["name"] == "Test Author 1"
+    assert response1.json()[1]["name"] == "Test Author 2"
+    assert response1.json()[0]["id"] == 1
+    assert response1.json()[1]["id"] == 2
+
+    response2 = client.get("/books/2/authors")
+    assert response2.status_code == 200, "Invalid response status"
+    assert len(response2.json()) == 1, "Invalid number of authors"
+    assert response2.json()[0]["name"] == "Test Author 1"
+    assert response2.json()[0]["id"] == 1
+
+    response3 = client.get("/books/3/authors")
+    assert response3.status_code == 200, "Invalid response status"
+    assert len(response3.json()) == 2, "Invalid number of authors"
+    assert response3.json()[0]["name"] == "Test Author 2"
+    assert response3.json()[1]["name"] == "Test Author 3"
+    assert response3.json()[0]["id"] == 2
+    assert response3.json()[1]["id"] == 3
+
+def test_get_author_books():
+    response1 = client.get("/authors/1/books")
+    assert response1.status_code == 200, "Invalid response status"
+    assert len(response1.json()) == 2, "Invalid number of books"
+    assert response1.json()[0]["title"] == "Test Book 1"
+    assert response1.json()[1]["title"] == "Test Book 2"
+    assert response1.json()[0]["id"] == 1
+    assert response1.json()[1]["id"] == 2
+
+    response2 = client.get("/authors/2/books")
+    assert response2.status_code == 200, "Invalid response status"
+    assert len(response2.json()) == 2, "Invalid number of books"
+    assert response2.json()[0]["title"] == "Test Book 1"
+    assert response2.json()[1]["title"] == "Test Book 3"
+    assert response2.json()[0]["id"] == 1
+    assert response2.json()[1]["id"] == 3
+
+    response3 = client.get("/authors/3/books")
+    assert response3.status_code == 200, "Invalid response status"
+    assert len(response3.json()) == 1, "Invalid number of books"
+    assert response3.json()[0]["title"] == "Test Book 3"
+    assert response3.json()[0]["id"] == 3