From a2f3f590f69c42832b4da244b8b8d33a56bbd24f Mon Sep 17 00:00:00 2001
From: Daniil Fajnberg <mail@daniil.fajnberg.de>
Date: Sun, 26 Dec 2021 23:22:12 +0100
Subject: [PATCH] test for __main__

---
 src/mwfin/__main__.py |  1 +
 tests/test_main.py    | 87 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 88 insertions(+)
 create mode 100644 tests/test_main.py

diff --git a/src/mwfin/__main__.py b/src/mwfin/__main__.py
index 89d39d6..9db4d13 100644
--- a/src/mwfin/__main__.py
+++ b/src/mwfin/__main__.py
@@ -63,6 +63,7 @@ def parse_cli() -> dict:
 def configure_logging(verbosity: int) -> None:
     root_logger = logging.getLogger()
     root_logger.addHandler(logging.StreamHandler())
+    root_logger.setLevel(logging.CRITICAL)
     if verbosity > 2:
         root_logger.setLevel(logging.DEBUG)
     elif verbosity == 2:
diff --git a/tests/test_main.py b/tests/test_main.py
new file mode 100644
index 0000000..f73d916
--- /dev/null
+++ b/tests/test_main.py
@@ -0,0 +1,87 @@
+import logging
+import json
+from unittest import IsolatedAsyncioTestCase
+from unittest.mock import patch
+from argparse import Namespace
+from io import StringIO
+
+from mwfin import __main__ as main_module
+
+
+class MainModuleTestCase(IsolatedAsyncioTestCase):
+
+    @patch.object(main_module.ArgumentParser, 'parse_args')
+    def test_parse_cli(self, mock_parse_args):
+        mock_parse_args.return_value = mock_args = Namespace(foo='a', bar='b')
+        expected_output = vars(mock_args)
+        output = main_module.parse_cli()
+        self.assertDictEqual(expected_output, output)
+
+    def test_configure_logging(self):
+        root_logger = logging.getLogger()
+        root_logger.handlers = []
+        main_module.configure_logging(verbosity=0)
+        self.assertEqual(1, len(root_logger.handlers))
+        self.assertIsInstance(root_logger.handlers[0], logging.StreamHandler)
+        self.assertEqual(logging.CRITICAL, root_logger.level)
+        root_logger.handlers = []
+        main_module.configure_logging(verbosity=1)
+        self.assertEqual(1, len(root_logger.handlers))
+        self.assertIsInstance(root_logger.handlers[0], logging.StreamHandler)
+        self.assertEqual(logging.WARNING, root_logger.level)
+        root_logger.handlers = []
+        main_module.configure_logging(verbosity=2)
+        self.assertEqual(1, len(root_logger.handlers))
+        self.assertIsInstance(root_logger.handlers[0], logging.StreamHandler)
+        self.assertEqual(logging.INFO, root_logger.level)
+        root_logger.handlers = []
+        main_module.configure_logging(verbosity=3)
+        self.assertEqual(1, len(root_logger.handlers))
+        self.assertIsInstance(root_logger.handlers[0], logging.StreamHandler)
+        self.assertEqual(logging.DEBUG, root_logger.level)
+        root_logger.handlers = []
+        main_module.configure_logging(verbosity=9999)
+        self.assertEqual(1, len(root_logger.handlers))
+        self.assertIsInstance(root_logger.handlers[0], logging.StreamHandler)
+        self.assertEqual(logging.DEBUG, root_logger.level)
+
+    @patch.object(main_module, 'get_all_financials')
+    @patch.object(main_module, 'configure_logging')
+    @patch.object(main_module, 'parse_cli')
+    async def test_main(self, mock_parse_cli, mock_configure_logging, mock_get_all_financials):
+        mock_parse_cli.return_value = args = {
+            main_module.VERBOSE: 'foo',
+            main_module.TICKER_SYMBOL: ['bar', 'baz'],
+            main_module.QUARTERLY: 'perhaps',
+            main_module.BATCH_SIZE: 'xyz',
+            main_module.TO_FILE: None,
+            main_module.JSON_INDENT: 42,
+        }
+        mock_get_all_financials.return_value = mock_data = {'data': 'something cool'}
+
+        # To stdout:
+        with patch.object(main_module, 'print') as mock_print:
+            await main_module.main()
+            mock_parse_cli.assert_called_once_with()
+            mock_configure_logging.assert_called_once_with(args[main_module.VERBOSE])
+            mock_get_all_financials.assert_awaited_once_with(*args[main_module.TICKER_SYMBOL],
+                                                             quarterly=args[main_module.QUARTERLY],
+                                                             concurrent_batch_size=args[main_module.BATCH_SIZE])
+            mock_print.assert_called_once_with(json.dumps(mock_data, indent=args[main_module.JSON_INDENT]))
+        mock_parse_cli.reset_mock()
+        mock_configure_logging.reset_mock()
+        mock_get_all_financials.reset_mock()
+
+        # To file:
+        args[main_module.TO_FILE] = 'some_file'
+        with patch.object(main_module, 'open') as mock_open:
+            mock_open.return_value.__enter__.return_value = mock_file = StringIO()
+            await main_module.main()
+            mock_parse_cli.assert_called_once_with()
+            mock_configure_logging.assert_called_once_with(args[main_module.VERBOSE])
+            mock_get_all_financials.assert_awaited_once_with(*args[main_module.TICKER_SYMBOL],
+                                                             quarterly=args[main_module.QUARTERLY],
+                                                             concurrent_batch_size=args[main_module.BATCH_SIZE])
+            expected_contents = json.dumps(mock_data, indent=args[main_module.JSON_INDENT])
+            mock_file.seek(0)
+            self.assertEqual(expected_contents, mock_file.read())