verify that symlinks arg is properly passed

tests/test_utils_platform_specific.py

@@ -7,9 +7,12 @@
 import textwrap
 from time import sleep
 import unittest
+from unittest.mock import patch
 
 from tests import BASE_DIR, TempDirTestCase
+import tufup.utils.platform_specific as ps
 from tufup.utils.platform_specific import (
+    ON_MAC,
     ON_WINDOWS,
     PLATFORM_SUPPORTED,
     run_bat_as_admin,
@@ -91,6 +94,14 @@ def test_run_bat_as_admin(self):
         self.assertTrue(len(output))
         self.assertNotIn(current_user, output)
 
+    @unittest.skipIf(condition=not ON_MAC, reason='macOS only')
+    def test_install_update_macos_symlinks(self):
+        with patch.object(ps, '_install_update_mac') as mock_install_update_mac:
+            ps.install_update(src_dir='', dst_dir='')
+            mock_install_update_mac.assert_called_with(symlinks=False)
+            ps.install_update(src_dir='', dst_dir='', symlinks=True)
+            mock_install_update_mac.assert_called_with(symlinks=True)
+
     @unittest.skipIf(
         condition=not PLATFORM_SUPPORTED, reason=_reason_platform_not_supported
     )