use Codex 5.3 to review template to spec

{{cookiecutter.project_slug}}/tests/test_internals.py

@@ -1,18 +1,22 @@
 from __future__ import annotations
 
+import pytest
+from pydantic import ValidationError
+
 from {{ cookiecutter.package_name }}.commands import format_greeting
 from {{ cookiecutter.package_name }}.config import get_config, get_config_source
-from {{ cookiecutter.package_name }}.config.paths import ENV_CONFIG_VAR
+from {{ cookiecutter.package_name }}.config.paths import ENV_CONFIG_VAR, config_file_path
 
 
 def test_env_config_override(tmp_path, monkeypatch) -> None:
     config_path = tmp_path / "config.toml"
-    config_path.write_text("greeting = \"Hi\"\n")
+    config_path.write_text('[app]\ngreeting = "Hi"\n\n[database]\npath = "/tmp/app.db"\n')
     monkeypatch.setenv(ENV_CONFIG_VAR, str(config_path))
 
     settings = get_config()
 
-    assert settings.greeting == "Hi"
+    assert settings.app.greeting == "Hi"
+    assert settings.database.path == "/tmp/app.db"
     assert get_config_source() == config_path
 
 
@@ -20,13 +24,39 @@ def test_missing_env_config_raises(tmp_path, monkeypatch) -> None:
     missing = tmp_path / "missing.toml"
     monkeypatch.setenv(ENV_CONFIG_VAR, str(missing))
 
-    try:
+    with pytest.raises(FileNotFoundError, match="Config file not found"):
         get_config()
-    except FileNotFoundError as exc:
-        assert str(missing) in str(exc)
-    else:
-        raise AssertionError("Expected FileNotFoundError")
+
+
+def test_xdg_default_config_is_loaded(monkeypatch) -> None:
+    path = config_file_path()
+    path.parent.mkdir(parents=True, exist_ok=True)
+    path.write_text('[app]\ngreeting = "Hola"\n\n[database]\npath = "/tmp/default.db"\n')
+    monkeypatch.delenv(ENV_CONFIG_VAR, raising=False)
+
+    settings = get_config()
+
+    assert settings.app.greeting == "Hola"
+    assert settings.database.path == "/tmp/default.db"
+    assert get_config_source() == path
+
+
+def test_unknown_key_raises_validation_error(tmp_path, monkeypatch) -> None:
+    config_path = tmp_path / "config.toml"
+    config_path.write_text('unknown = "value"\n')
+    monkeypatch.setenv(ENV_CONFIG_VAR, str(config_path))
+
+    with pytest.raises(ValidationError):
+        get_config()
+
+
+def test_settings_are_frozen() -> None:
+    settings = get_config()
+
+    with pytest.raises(ValidationError, match="frozen"):
+        settings.app.greeting = "Mutated"
 
 
 def test_format_greeting() -> None:
     assert format_greeting("Ada") == "Hello, Ada!"
+    assert format_greeting("Ada", greeting="Hi") == "Hi, Ada!"