logs: log actual pytest test failure

The failure will be logged in test.log so all information to debug
the failure is in one place.

pytest_mh/_private/data.py

@@ -28,6 +28,11 @@ def __init__(self, multihost: MultihostConfig | None, topology_mark: TopologyMar
         Test run outcome, available in fixture finalizers.
         """
 
+        self.result: pytest.TestReport | None = None
+        """
+        Pytest test result.
+        """
+
     def _init(self) -> None:
         """
         Postponed initialization. This is called once we know that current

pytest_mh/_private/fixtures.py

@@ -384,5 +384,8 @@ def mh(request: pytest.FixtureRequest) -> Generator[MultihostFixture, None, None
         yield mh
         mh.log_phase("TEST DONE")
     finally:
+        if data.outcome == "failed" and data.result is not None:
+            mh.logger.error(data.result.longreprtext)
+
         mh.split_log_file("test.log")
         mh._exit()

pytest_mh/_private/plugin.py

@@ -364,6 +364,7 @@ def pytest_runtest_makereport(
             return
 
         data.outcome = result.outcome
+        data.result = result
 
     # Hook from pytest-output plugin
     @pytest.hookimpl(optionalhook=True)