test: reorganize core suite into explicit domain files

tests/stats/test_stats_email_resolution.py

@@ -0,0 +1,64 @@
+from __future__ import annotations
+
+import json
+from pathlib import Path
+
+from auditui.stats.email import (
+    find_email_in_data,
+    first_email,
+    get_email_from_account_info,
+    get_email_from_auth,
+    get_email_from_auth_file,
+    get_email_from_config,
+    resolve_email,
+)
+
+
+def test_find_email_in_nested_data() -> None:
+    """Ensure nested structures are scanned until a plausible email is found."""
+    data = {"a": {"b": ["nope", "user@example.com"]}}
+    assert find_email_in_data(data) == "user@example.com"
+
+
+def test_first_email_skips_unknown_and_none() -> None:
+    """Ensure first_email ignores empty and Unknown sentinel values."""
+    assert first_email(None, "Unknown", "ok@example.com") == "ok@example.com"
+
+
+def test_get_email_from_config_and_auth_file(tmp_path: Path) -> None:
+    """Ensure config and auth-file readers extract valid email fields."""
+    config_path = tmp_path / "config.json"
+    auth_path = tmp_path / "auth.json"
+    config_path.write_text(
+        json.dumps({"email": "config@example.com"}), encoding="utf-8"
+    )
+    auth_path.write_text(json.dumps({"email": "auth@example.com"}), encoding="utf-8")
+    assert get_email_from_config(config_path) == "config@example.com"
+    assert get_email_from_auth_file(auth_path) == "auth@example.com"
+
+
+def test_get_email_from_auth_prefers_username() -> None:
+    """Ensure auth object attributes are checked in expected precedence order."""
+    auth = type(
+        "Auth", (), {"username": "user@example.com", "login": None, "email": None}
+    )()
+    assert get_email_from_auth(auth) == "user@example.com"
+
+
+def test_get_email_from_account_info_supports_nested_customer_info() -> None:
+    """Ensure account email can be discovered in nested customer_info payload."""
+    info = {"customer_info": {"primary_email": "nested@example.com"}}
+    assert get_email_from_account_info(info) == "nested@example.com"
+
+
+def test_resolve_email_falls_back_to_account_getter(tmp_path: Path) -> None:
+    """Ensure resolve_email checks account-info callback when local sources miss."""
+    auth = object()
+    value = resolve_email(
+        auth,
+        client=object(),
+        config_path=tmp_path / "missing-config.json",
+        auth_path=tmp_path / "missing-auth.json",
+        get_account_info=lambda: {"customer_email": "account@example.com"},
+    )
+    assert value == "account@example.com"