Add configurable data providers and localize frontend UI

backend/tests/test_data_config.py

@@ -0,0 +1,55 @@
+# -*- coding: utf-8 -*-
+"""Tests for data source config ordering."""
+
+from backend.config.data_config import get_config, reset_config
+
+
+def test_data_config_prefers_env_source(monkeypatch):
+    monkeypatch.setenv("FIN_DATA_SOURCE", "financial_datasets")
+    monkeypatch.setenv("FINNHUB_API_KEY", "fh")
+    monkeypatch.setenv("FINANCIAL_DATASETS_API_KEY", "fd")
+    reset_config()
+
+    config = get_config()
+
+    assert config.sources[0] == "financial_datasets"
+    assert "local_csv" in config.sources
+
+
+def test_enabled_data_sources_filters_available_sources(monkeypatch):
+    monkeypatch.setenv("FINNHUB_API_KEY", "fh-key")
+    monkeypatch.setenv("FINANCIAL_DATASETS_API_KEY", "fd-key")
+    monkeypatch.setenv("ENABLED_DATA_SOURCES", "financial_datasets,local_csv")
+    monkeypatch.delenv("FIN_DATA_SOURCE", raising=False)
+    reset_config()
+
+    config = get_config()
+
+    assert config.sources == ["financial_datasets", "local_csv"]
+    assert config.source == "financial_datasets"
+
+
+def test_preferred_source_reorders_enabled_sources(monkeypatch):
+    monkeypatch.setenv("FINNHUB_API_KEY", "fh-key")
+    monkeypatch.setenv("FINANCIAL_DATASETS_API_KEY", "fd-key")
+    monkeypatch.setenv("ENABLED_DATA_SOURCES", "financial_datasets,finnhub,local_csv")
+    monkeypatch.setenv("FIN_DATA_SOURCE", "finnhub")
+    reset_config()
+
+    config = get_config()
+
+    assert config.sources == ["finnhub", "financial_datasets", "local_csv"]
+    assert config.source == "finnhub"
+
+
+def test_yfinance_can_be_enabled_without_api_key(monkeypatch):
+    monkeypatch.delenv("FINNHUB_API_KEY", raising=False)
+    monkeypatch.delenv("FINANCIAL_DATASETS_API_KEY", raising=False)
+    monkeypatch.setenv("FIN_DATA_SOURCE", "yfinance")
+    monkeypatch.setenv("ENABLED_DATA_SOURCES", "yfinance,local_csv")
+    reset_config()
+
+    config = get_config()
+
+    assert config.sources == ["yfinance", "local_csv"]
+    assert config.source == "yfinance"