feat(V2): IBKR client base + auth header + tickle keep-alive

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/unit/exchanges/ibkr/test_client.py

@@ -0,0 +1,54 @@
+from __future__ import annotations
+
+import re
+from unittest.mock import AsyncMock, MagicMock
+
+import pytest
+from cerbero_mcp.exchanges.ibkr.client import IBKRClient
+from pytest_httpx import HTTPXMock
+
+
+@pytest.fixture
+def fake_signer():
+    s = MagicMock()
+    s.consumer_key = "CK"
+    s.access_token = "AT"
+    s.get_live_session_token = AsyncMock(return_value="LSTBASE64==")
+    s.sign_with_lst = MagicMock(return_value="SIG==")
+    s.make_oauth_params = MagicMock(return_value={
+        "oauth_consumer_key": "CK", "oauth_token": "AT",
+        "oauth_nonce": "n", "oauth_timestamp": "1",
+        "oauth_signature_method": "HMAC-SHA256", "oauth_version": "1.0",
+    })
+    return s
+
+
+@pytest.fixture
+def client(fake_signer):
+    return IBKRClient(
+        signer=fake_signer,
+        account_id="DU1234",
+        paper=True,
+        base_url="https://api.ibkr.com/v1/api",
+    )
+
+
+@pytest.mark.asyncio
+async def test_health_no_network(client):
+    info = await client.health()
+    assert info["status"] == "ok"
+    assert info["paper"] is True
+
+
+@pytest.mark.asyncio
+async def test_get_account_summary(httpx_mock: HTTPXMock, client):
+    httpx_mock.add_response(
+        url=re.compile(r".*/portfolio/DU1234/summary"),
+        json={"netliquidation": {"amount": 10000, "currency": "USD"}, "totalcashvalue": {"amount": 8000}},
+    )
+    httpx_mock.add_response(
+        url=re.compile(r".*/tickle"),
+        json={"session": "abc"},
+    )
+    data = await client.get_account()
+    assert "netliquidation" in data