Moved the logic for getting linked data into the relationship router and

added tests for authors.

tests/test_authors.py

@@ -10,3 +10,57 @@ from tests.test_misc import setup_database
 client = TestClient(app)
 
 #TODO: add tests for author endpoints
+
+def test_empty_list_authors(setup_database):
+    response = client.get("/authors")
+    print(response.json())
+    assert response.status_code == 200, "Invalid response status"
+    assert response.json() == {"authors": [], "total": 0}, "Invalid response data"
+
+def test_create_author(setup_database):
+    response = client.post("/authors", json={"name": "Test Author"})
+    print(response.json())
+    assert response.status_code == 200, "Invalid response status"
+    assert response.json() == {"id": 1, "name": "Test Author"}, "Invalid response data"
+
+def test_list_authors(setup_database):
+    response = client.get("/authors")
+    print(response.json())
+    assert response.status_code == 200, "Invalid response status"
+    assert response.json() == {"authors": [{"id": 1, "name": "Test Author"}], "total": 1}, "Invalid response data"
+
+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"
+
+def test_get_not_existing_author(setup_database):
+    response = client.get("/authors/2")
+    print(response.json())
+    assert response.status_code == 404, "Invalid response status"
+    assert response.json() == {"detail": "Author not found"}, "Invalid response data"
+
+def test_update_author(setup_database):
+    response = client.get("/authors/1")
+    assert response.status_code == 200, "Invalid response status"
+    response = client.put("/authors/1", json={"name": "Updated Author"})
+    assert response.status_code == 200, "Invalid response status"
+    assert response.json() == {"id": 1, "name": "Updated Author"}, "Invalid response data"
+
+def test_update_not_existing_author(setup_database):
+    response = client.put("/authors/2", json={"name": "Updated Author"})
+    assert response.status_code == 404, "Invalid response status"
+    assert response.json() == {"detail": "Author not found"}, "Invalid response data"
+
+def test_delete_author(setup_database):
+    response = client.get("/authors/1")
+    assert response.status_code == 200, "Invalid response status"
+    response = client.delete("/authors/1")
+    assert response.status_code == 200, "Invalid response status"
+    assert response.json() == {"id": 1, "name": "Updated Author"}, "Invalid response data"
+
+def test_not_existing_delete_author(setup_database):
+    response = client.delete("/authors/2")
+    assert response.status_code == 404, "Invalid response status"
+    assert response.json() == {"detail": "Author not found"}, "Invalid response data"