Add test for strategy-updater start method

tests/commands/test_commands.py

@@ -14,7 +14,8 @@ from freqtrade.commands import (start_backtesting_show, start_convert_data, star
                                 start_hyperopt_show, start_install_ui, start_list_data,
                                 start_list_exchanges, start_list_markets, start_list_strategies,
                                 start_list_timeframes, start_new_strategy, start_show_trades,
-                                start_test_pairlist, start_trading, start_webserver)
+                                start_strategy_update, start_test_pairlist, start_trading,
+                                start_webserver)
 from freqtrade.commands.db_commands import start_convert_db
 from freqtrade.commands.deploy_commands import (clean_ui_subdir, download_and_install_ui,
                                                 get_ui_download_url, read_ui_version)
@@ -1546,3 +1547,37 @@ def test_start_convert_db(mocker, fee, tmpdir, caplog):
     start_convert_db(pargs)
 
     assert db_target_file.is_file()
+
+
+def test_start_strategy_updater(mocker,  tmpdir):
+    sc_mock = mocker.patch('freqtrade.commands.strategy_utils_commands.start_conversion')
+    teststrats = Path(__file__).parent.parent / 'strategy/strats'
+    args = [
+        "strategy-updater",
+        "--userdir",
+        str(tmpdir),
+        "--strategy-path",
+        str(teststrats),
+    ]
+    pargs = get_args(args)
+    pargs['config'] = None
+    start_strategy_update(pargs)
+    # Number of strategies in the test directory
+    assert sc_mock.call_count == 11
+
+    sc_mock.reset_mock()
+    args = [
+        "strategy-updater",
+        "--userdir",
+        str(tmpdir),
+        "--strategy-path",
+        str(teststrats),
+        "--strategy-list",
+        "StrategyTestV3",
+        "StrategyTestV2"
+    ]
+    pargs = get_args(args)
+    pargs['config'] = None
+    start_strategy_update(pargs)
+    # Number of strategies in the test directory
+    assert sc_mock.call_count == 2