Add db migration test

tests/test_binance_mig.py

@@ -3,7 +3,11 @@
 import shutil
 from pathlib import Path
 
-from freqtrade.util.binance_mig import migrate_binance_futures_data
+import pytest
+
+from freqtrade.persistence import Trade
+from freqtrade.util.binance_mig import migrate_binance_futures_data, migrate_binance_futures_names
+from tests.conftest import create_mock_trades_usdt, log_has
 
 
 def test_binance_mig_data_conversion(default_conf_usdt, tmpdir, testdatadir):
@@ -35,3 +39,21 @@ def test_binance_mig_data_conversion(default_conf_usdt, tmpdir, testdatadir):
     for file in files:
         fn_after = futures_dst / f'{pair_unified}{file}'
         assert fn_after.exists()
+
+
+@pytest.mark.usefixtures("init_persistence")
+def test_binance_mig_db_conversion(default_conf_usdt, fee, caplog):
+    # Does nothing in spot mode
+    migrate_binance_futures_names(default_conf_usdt)
+
+    create_mock_trades_usdt(fee, None)
+
+    for t in Trade.get_trades():
+        t.trading_mode = 'FUTURES'
+        t.exchange = 'binance'
+    Trade.commit()
+
+    default_conf_usdt['datadir'] = Path(default_conf_usdt['datadir'])
+    default_conf_usdt['trading_mode'] = 'futures'
+    migrate_binance_futures_names(default_conf_usdt)
+    assert log_has('Migrating binance futures pairs in database.', caplog)