test(auth): cover single-session revoke behavior

docs/api-reference.md

@@ -546,7 +546,8 @@ Note: list includes refresh sessions and a synthetic current access-token sessio
 ### DELETE `/api/v1/auth/sessions/{jti}`
 
 Auth required.  
-Response: `204`
+Response: `204`  
+Behavior: revokes only the specified refresh session token (`jti`); current access token remains valid.
 
 ### DELETE `/api/v1/auth/sessions`
 

tests/test_auth_flow.py

@@ -118,6 +118,52 @@ async def test_revoke_all_sessions_invalidates_access_and_refresh(client, db_ses
     assert refresh_response.status_code == 401
 
 
+async def test_revoke_single_session_invalidates_only_target_refresh_token(client, db_session):
+    payload = {
+        "email": "frank@example.com",
+        "name": "Frank",
+        "username": "frank",
+        "password": "strongpass123",
+    }
+    await client.post("/api/v1/auth/register", json=payload)
+    token_row = await db_session.execute(select(EmailVerificationToken).order_by(EmailVerificationToken.id.desc()))
+    verify_token = token_row.scalar_one().token
+    await client.post("/api/v1/auth/verify-email", json={"token": verify_token})
+
+    login_response = await client.post(
+        "/api/v1/auth/login",
+        json={"email": payload["email"], "password": payload["password"]},
+    )
+    assert login_response.status_code == 200
+    tokens = login_response.json()
+    access_token = tokens["access_token"]
+    refresh_token = tokens["refresh_token"]
+
+    sessions_response = await client.get(
+        "/api/v1/auth/sessions",
+        headers={"Authorization": f"Bearer {access_token}"},
+    )
+    assert sessions_response.status_code == 200
+    refresh_sessions = [item for item in sessions_response.json() if item.get("token_type") == "refresh"]
+    assert len(refresh_sessions) >= 1
+    target_jti = refresh_sessions[0]["jti"]
+
+    revoke_response = await client.delete(
+        f"/api/v1/auth/sessions/{target_jti}",
+        headers={"Authorization": f"Bearer {access_token}"},
+    )
+    assert revoke_response.status_code == 204
+
+    refresh_after_revoke = await client.post("/api/v1/auth/refresh", json={"refresh_token": refresh_token})
+    assert refresh_after_revoke.status_code == 401
+
+    me_after_revoke = await client.get(
+        "/api/v1/auth/me",
+        headers={"Authorization": f"Bearer {access_token}"},
+    )
+    assert me_after_revoke.status_code == 200
+
+
 async def test_twofa_setup_is_blocked_when_already_enabled(client, db_session):
     payload = {
         "email": "dana@example.com",