Add configurable data providers and localize frontend UI

backend/tests/test_provider_utils.py

@@ -0,0 +1,15 @@
+# -*- coding: utf-8 -*-
+"""Tests for market symbol normalization helpers."""
+
+from backend.data.provider_utils import describe_symbol, normalize_symbol
+
+
+def test_normalize_symbol_exchange_prefix():
+    assert normalize_symbol("sh600519") == "600519"
+    assert normalize_symbol("600519.SH") == "600519"
+
+
+def test_normalize_symbol_us_ticker():
+    symbol = describe_symbol("aapl")
+    assert symbol.canonical == "AAPL"
+    assert symbol.market == "us"