Add test for __main__ entry point module

Author: caleb531

tests/test_main.py

@@ -0,0 +1,26 @@
+#!/usr/bin/env python3
+"""test the __main__ entry point module"""
+
+import importlib
+import importlib.machinery
+import importlib.util
+from unittest.mock import MagicMock, patch
+
+from tests import ICATestCase
+
+
+class TestMain(ICATestCase):
+
+    @patch("ica.cli.main", return_value=None)
+    def test_main(self, cli_main: MagicMock) -> None:
+        """should import main"""
+        # Load the module spec and create the module
+        loader = importlib.machinery.SourceFileLoader("__main__", "./ica/__main__.py")
+        spec = importlib.util.spec_from_loader(loader.name, loader)
+        if not spec:
+            raise ImportError("Failed to load module spec")
+        main_module = importlib.util.module_from_spec(spec)
+        # Expose package information to dynamically-imported module
+        main_module.__package__ = __package__
+        loader.exec_module(main_module)
+        cli_main.assert_called_once()