Add startup test case

tests/optimize/test_lookahead_analysis.py

@@ -1,17 +1,16 @@
 # pragma pylint: disable=missing-docstring, W0212, line-too-long, C0103, unused-argument
 
-from unittest.mock import PropertyMock
+from pathlib import Path
+from unittest.mock import MagicMock, PropertyMock
 
-import numpy as np
 import pytest
 
 import freqtrade.commands.arguments
 import freqtrade.optimize.lookahead_analysis
-from freqtrade.configuration import TimeRange
-from freqtrade.data import history
-from freqtrade.data.converter import clean_ohlcv_dataframe
+from freqtrade.commands.optimize_commands import start_lookahead_analysis
 from freqtrade.data.history import get_timerange
-from tests.conftest import generate_test_data, patch_exchange
+from freqtrade.exceptions import OperationalException
+from tests.conftest import CURRENT_TEST_STRATEGY, get_args, patch_exchange
 
 
 @pytest.fixture
@@ -22,11 +21,46 @@ def lookahead_conf(default_conf_usdt):
     return default_conf_usdt
 
 
-def trim_dictlist(dict_list, num):
-    new = {}
-    for pair, pair_data in dict_list.items():
-        new[pair] = pair_data[num:].reset_index()
-    return new
+def test_start_start_lookahead_analysis(mocker):
+    single_mock = MagicMock()
+    mocker.patch.multiple(
+        'freqtrade.optimize.lookahead_analysis.LookaheadAnalysisSubFunctions',
+        initialize_single_lookahead_analysis=single_mock,
+        text_table_lookahead_analysis_instances=MagicMock(),
+        )
+    args = [
+        "lookahead-analysis",
+        "--strategy",
+        CURRENT_TEST_STRATEGY,
+        "--strategy-path",
+        str(Path(__file__).parent.parent / "strategy" / "strats"),
+    ]
+    pargs = get_args(args)
+    pargs['config'] = None
+
+    start_lookahead_analysis(pargs)
+    assert single_mock.call_count == 1
+
+    single_mock.reset_mock()
+
+    # Test invalid config
+    args = [
+        "lookahead-analysis",
+        "--strategy",
+        CURRENT_TEST_STRATEGY,
+        "--strategy-path",
+        str(Path(__file__).parent.parent / "strategy" / "strats"),
+        "--targeted-trade-amount",
+        "10",
+        "--minimum-trade-amount",
+        "20",
+        ]
+    pargs = get_args(args)
+    pargs['config'] = None
+    with pytest.raises(OperationalException,
+                       match=r"targeted trade amount can't be smaller than .*"):
+        start_lookahead_analysis(pargs)
+
 
 
 def test_biased_strategy(lookahead_conf, mocker, caplog) -> None: