PYSCAN-42 Fix code coverage for the __main__ file. (#22)

Author: Jeremi Do Dinh

tests/test_main.py

@@ -0,0 +1,46 @@
+#
+# Sonar Scanner Python
+# Copyright (C) 2011-2023 SonarSource SA.
+# mailto:info AT sonarsource DOT com
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 3 of the License, or (at your option) any later version.
+# This program is distributed in the hope that it will be useful,
+#
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with this program; if not, write to the Free Software Foundation,
+# Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+import unittest
+from unittest.mock import patch, Mock, MagicMock
+from py_sonar_scanner.__main__ import scan
+from py_sonar_scanner.scanner import Scanner
+
+
+class TestMain(unittest.TestCase):
+    @patch("py_sonar_scanner.scanner.Scanner")
+    @patch("py_sonar_scanner.__main__.Environment")
+    @patch("py_sonar_scanner.__main__.Configuration")
+    def test_main_scan(self, mock_cfg, mock_env, mock_scanner):
+        configuration_instance = MagicMock()
+        configuration_instance.setup = Mock()
+        mock_cfg.return_value = configuration_instance
+
+        environment_instance = MagicMock()
+        environment_instance.setup = Mock()
+        mock_scanner.scan = Mock()
+        environment_instance.scanner.return_value = mock_scanner
+        mock_env.return_value = environment_instance
+
+        scan()
+
+        configuration_instance.setup.assert_called_once()
+        environment_instance.setup.assert_called_once()
+        environment_instance.scanner.assert_called_once()
+        mock_scanner.scan.assert_called_once()