add rudimentary test for process_creation_flags arg

src/tufup/utils/platform_specific.py

@@ -218,6 +218,8 @@ def _install_update_win(
         # using the process_creation_flags argument
         if process_creation_flags is None:
             process_creation_flags = subprocess.CREATE_NEW_CONSOLE
+        else:
+            logger.debug('using custom process creation flags')
         # we use Popen() instead of run(), because the latter blocks execution
         subprocess.Popen([script_path], creationflags=process_creation_flags)
     logger.debug('exiting')

tests/test_utils_platform_specific.py

@@ -22,6 +22,7 @@
 )
 
 DUMMY_APP_CONTENT = f"""
+import subprocess
 import sys
 sys.path.append('{(BASE_DIR.parent / 'src').as_posix()}')
 from tufup.utils.platform_specific import install_update
@@ -176,6 +177,22 @@ def test_install_update_log_file(self):
         log_file_content = log_file_path.read_text()
         self.assertTrue(log_file_content)
 
+    @unittest.skipIf(
+        condition=not ON_WINDOWS, reason='process_creation_flags is for windows only'
+    )
+    def test_install_update_process_creation_flags(self):
+        # the log file is only used to verify that the batch file has run successfully
+        log_file_name = 'install.log'
+        extra_kwargs_strings = [
+            'process_creation_flags=subprocess.CREATE_NO_WINDOW',
+            f'log_file_name="{log_file_name}"',
+        ]
+        # run the dummy app in a separate process
+        self.run_dummy_app(extra_kwargs_strings=extra_kwargs_strings)
+        # a log file should exist
+        log_file_path = self.dst_dir / log_file_name
+        self.assertTrue(log_file_path.read_text())
+
     @unittest.skipIf(
         condition=not ON_WINDOWS, reason='windows batch files are windows only'
     )