fix: propagate exit code (#108)

* fix(pytest): propagate exit code

* feat: derive exit code for unittest

neotest_python/pytest_.py

@@ -4,7 +4,7 @@ from typing import Callable, Dict, List, Optional, Union
 from . import params_getter
 from io import StringIO
 from pathlib import Path
-from typing import Callable, Dict, Generator, List, Optional, Union
+from typing import Callable, Dict, Generator, List, Optional, Tuple, Union
 
 import pytest
 from _pytest._code.code import ExceptionRepr
@@ -24,18 +24,18 @@ class PytestNeotestAdapter(NeotestAdapter):
         self,
         args: List[str],
         stream: Callable[[str, NeotestResult], None],
-    ) -> Dict[str, NeotestResult]:
+    ) -> Tuple[Dict[str, NeotestResult], int]:
         result_collector = NeotestResultCollector(
             self, stream=stream, emit_parameterized_ids=self.emit_parameterized_ids
         )
-        pytest.main(
+        exit_code = pytest.main(
             args=args,
             plugins=[
                 result_collector,
                 NeotestDebugpyPlugin(),
             ],
         )
-        return result_collector.results
+        return result_collector.results, int(exit_code)
 
 
 class NeotestResultCollector: