Properly handle sys.exit() as sys.exit(0). Fixes #489

src/debugpy/_vendored/pydevd/_pydevd_bundle/pydevd_process_net_command_json.py

@@ -390,7 +390,7 @@ def get_variable_presentation(setting, default):
         self.api.set_show_return_values(py_db, self._options.show_return_value)
 
         if not self._options.break_system_exit_zero:
-            ignore_system_exit_codes = [0]
+            ignore_system_exit_codes = [0, None]
             if self._options.django_debug:
                 ignore_system_exit_codes += [3]
 

src/debugpy/_vendored/pydevd/tests_python/resources/_debugger_case_sysexit_none.py

@@ -0,0 +1,9 @@
+import sys
+
+
+def main():
+    print('TEST SUCEEDED!')
+    sys.exit()
+
+
+main()  # call_main_line

src/debugpy/_vendored/pydevd/tests_python/test_debugger_json.py

@@ -1011,17 +1011,19 @@ def test_case_sys_exit_unhandled_exception(case_setup):
 
 
 @pytest.mark.parametrize('break_on_system_exit_zero', [True, False])
-def test_case_sys_exit_0_unhandled_exception(case_setup, break_on_system_exit_zero):
+@pytest.mark.parametrize('target', ['_debugger_case_sysexit_0.py', '_debugger_case_sysexit_none.py'])
+def test_case_sys_exit_0_unhandled_exception(case_setup, break_on_system_exit_zero, target):
 
-    with case_setup.test_file('_debugger_case_sysexit_0.py', EXPECTED_RETURNCODE=0) as writer:
+    with case_setup.test_file(target, EXPECTED_RETURNCODE=0) as writer:
         json_facade = JsonFacade(writer)
-        json_facade.write_launch(
-            debugOptions=['BreakOnSystemExitZero'] if break_on_system_exit_zero else [],
-        )
+        kwargs = {}
+        if break_on_system_exit_zero:
+            kwargs = {'breakOnSystemExitZero': True}
+        json_facade.write_launch(**kwargs)
         json_facade.write_set_exception_breakpoints(['uncaught'])
         json_facade.write_make_initial_run()
 
-        break_line = writer.get_line_index_with_content('sys.exit(0)')
+        break_line = writer.get_line_index_with_content('sys.exit(')
         if break_on_system_exit_zero:
             json_facade.wait_for_thread_stopped(
                 reason='exception', line=break_line)