tests/web/test_import_safety.py

"""Importing the web layer must not pull matplotlib or a provider SDK (offline
invariant — same discipline as tests/viz/test_import_safety.py)."""
from __future__ import annotations

import sys


def test_importing_web_pulls_no_heavy_or_network_deps():
    # Drop any pre-loaded matplotlib and proteus.web.local so we observe a fresh
    # import graph even when earlier tests have cached these modules.
    for mod in list(sys.modules):
        if mod == "matplotlib" or mod.startswith("matplotlib."):
            del sys.modules[mod]
    for mod in list(sys.modules):
        if mod == "proteus.web.local" or mod.startswith("proteus.web.local."):
            del sys.modules[mod]

    import proteus.web.local            # noqa: F401
    import proteus.web.local.server     # noqa: F401

    assert "matplotlib" not in sys.modules, (
        "importing proteus.web.local pulled in matplotlib; keep the web layer offline"
    )
    # provider SDKs are never imported by the web layer
    for sdk in ("openai", "anthropic", "google", "ollama"):
        assert sdk not in sys.modules, (
            f"importing proteus.web.local pulled in provider SDK {sdk!r}"
        )

    # spectate routes import providers LAZILY (inside the handler), so a plain
    # import of the web layer must still pull no provider SDK.
    import proteus.web.local.server  # noqa: F401  (re-exercised after the clear above)
    for sdk in ("openai", "anthropic", "google", "ollama"):
        assert sdk not in sys.modules