feat(cloud): harden multi-tenant runtime resources

tests/unit_tests/platform/test_line_limits.py

@@ -0,0 +1,30 @@
+from __future__ import annotations
+
+import pytest
+from unittest.mock import MagicMock
+
+from langbot.pkg.platform import botmgr as _botmgr  # noqa: F401
+from langbot.pkg.platform.sources import line
+
+
+def test_line_media_content_accepts_limit_boundary(monkeypatch) -> None:
+    monkeypatch.setattr(line, 'MAX_LINE_MEDIA_BYTES', 4)
+    content = b'1234'
+
+    assert line._validate_line_media_content(content) is content
+
+
+def test_line_media_content_rejects_oversized_payload(monkeypatch) -> None:
+    monkeypatch.setattr(line, 'MAX_LINE_MEDIA_BYTES', 4)
+
+    with pytest.raises(ValueError, match='LINE media exceeds'):
+        line._validate_line_media_content(b'12345')
+
+
+@pytest.mark.asyncio
+async def test_line_kill_closes_api_client() -> None:
+    api_client = MagicMock()
+    adapter = line.LINEAdapter.model_construct(api_client=api_client)
+
+    assert await adapter.kill() is True
+    api_client.close.assert_called_once_with()