Added new file to test import of doorstop when not installed.

doorstop/tests/test_init.py

@@ -0,0 +1,32 @@
+# SPDX-License-Identifier: LGPL-3.0-only
+
+"""Unit tests for the doorstop.__init__ module."""
+import unittest
+from importlib import reload
+from importlib.metadata import PackageNotFoundError
+from unittest.mock import patch
+
+import doorstop
+
+
+class InitTestCase(unittest.TestCase):
+    """Init test class for server tests."""
+
+    @patch("importlib.metadata.version")
+    def test_import(self, mock_version):
+        """Verify the doorstop package can be imported as a local version.
+
+        This test is a bit of a hack. It is intended to verify that the
+        doorstop package can be imported as a local version. This is
+        necessary because if the doorstop package is not installed in the
+        test environment, the version shall be set to "(local)". The patch
+        ensures that the version lookup will fail.
+        """
+        mock_version.side_effect = PackageNotFoundError()
+
+        # Reload the doorstop package to allow import of the patched version.
+        reload(doorstop)
+        from doorstop import VERSION
+
+        # Assert that the version number is correct.
+        self.assertEqual("Doorstop v(local)", VERSION)