Extract build-config tests to new file

tests/commands/test_build_config.py

@@ -0,0 +1,42 @@
+import json
+from pathlib import Path
+from unittest.mock import MagicMock
+
+import pytest
+
+from freqtrade.commands import start_new_config
+from tests.conftest import get_args, log_has_re
+
+
+@pytest.mark.parametrize('exchange', ['bittrex', 'binance', 'kraken', 'ftx'])
+def test_start_new_config(mocker, caplog, exchange):
+    wt_mock = mocker.patch.object(Path, "write_text", MagicMock())
+    mocker.patch.object(Path, "exists", MagicMock(return_value=False))
+    sample_selections = {
+        'max_open_trades': 3,
+        'stake_currency': 'USDT',
+        'stake_amount': 100,
+        'fiat_display_currency': 'EUR',
+        'ticker_interval': '15m',
+        'dry_run': True,
+        'exchange_name': exchange,
+        'exchange_key': 'sampleKey',
+        'exchange_secret': 'Samplesecret',
+        'telegram': False,
+        'telegram_token': 'asdf1244',
+        'telegram_chat_id': '1144444',
+    }
+    mocker.patch('freqtrade.commands.build_config_commands.ask_user_config',
+                 return_value=sample_selections)
+    args = [
+        "new-config",
+        "--config",
+        "coolconfig.json"
+    ]
+    start_new_config(get_args(args))
+
+    assert log_has_re("Writing config to .*", caplog)
+    assert wt_mock.call_count == 1
+    result = json.loads(wt_mock.call_args_list[0][0][0])
+    assert result['exchange']['name'] == exchange
+    assert result['ticker_interval'] == '15m'