test(config): pin config/env load behavior before managed scope

tests/hermes_cli/test_managed_scope_regression.py

@@ -0,0 +1,99 @@
+"""Regression harness — pins config/env load behavior BEFORE managed scope exists.
+
+Every test here must keep passing through all later phases when NO managed scope
+is present. They are the 'managed scope is invisible when absent' contract.
+"""
+import os
+import textwrap
+
+import pytest
+
+
+@pytest.fixture
+def hermes_home(tmp_path, monkeypatch):
+    home = tmp_path / "hermes_home"
+    home.mkdir()
+    monkeypatch.setenv("HERMES_HOME", str(home))
+    # No managed dir: point the override at a guaranteed-absent path so a real
+    # /etc/hermes on the dev/CI box can't influence the test.
+    monkeypatch.setenv("HERMES_MANAGED_DIR", str(tmp_path / "no_such_managed_dir"))
+    # Clear caches so each test re-reads from disk.
+    import hermes_cli.config as cfg
+
+    cfg._LOAD_CONFIG_CACHE.clear()
+    cfg._RAW_CONFIG_CACHE.clear()
+    cfg.invalidate_env_cache()
+    return home
+
+
+def _write_user_config(home, body: str):
+    (home / "config.yaml").write_text(textwrap.dedent(body), encoding="utf-8")
+    import hermes_cli.config as cfg
+
+    cfg._LOAD_CONFIG_CACHE.clear()
+    cfg._RAW_CONFIG_CACHE.clear()
+
+
+def test_user_config_overrides_default(hermes_home, monkeypatch):
+    from hermes_cli.config import load_config, cfg_get
+
+    _write_user_config(
+        hermes_home,
+        """
+        model:
+          default: user/model-x
+        """,
+    )
+    cfg = load_config()
+    assert cfg_get(cfg, "model", "default") == "user/model-x"
+
+
+def test_env_expansion_in_user_config(hermes_home, monkeypatch):
+    from hermes_cli.config import load_config, cfg_get
+
+    monkeypatch.setenv("MY_BASE", "https://example.test")
+    _write_user_config(
+        hermes_home,
+        """
+        providers:
+          custom:
+            base_url: ${MY_BASE}/v1
+        """,
+    )
+    cfg = load_config()
+    assert cfg_get(cfg, "providers", "custom", "base_url") == "https://example.test/v1"
+
+
+def test_no_managed_dir_means_user_value_wins(hermes_home):
+    """Sanity: with the managed override pointing at an absent dir, nothing changes."""
+    from hermes_cli.config import load_config, cfg_get
+
+    _write_user_config(
+        hermes_home,
+        """
+        model:
+          default: user/model-y
+        """,
+    )
+    assert cfg_get(load_config(), "model", "default") == "user/model-y"
+
+
+def test_user_env_overrides_shell(tmp_path, monkeypatch):
+    from hermes_cli.env_loader import load_hermes_dotenv
+
+    home = tmp_path / "home"
+    home.mkdir()
+    (home / ".env").write_text("FOO_TOKEN=from_user_env\n", encoding="utf-8")
+    monkeypatch.setenv("FOO_TOKEN", "from_shell")
+    load_hermes_dotenv(hermes_home=str(home))
+    assert os.environ["FOO_TOKEN"] == "from_user_env"
+
+
+def test_missing_user_env_is_noop(tmp_path, monkeypatch):
+    from hermes_cli.env_loader import load_hermes_dotenv
+
+    home = tmp_path / "home"
+    home.mkdir()
+    monkeypatch.setenv("BAR_TOKEN", "from_shell")
+    load_hermes_dotenv(hermes_home=str(home))
+    assert os.environ["BAR_TOKEN"] == "from_shell"