test: Print stderr when subprocess fails

Author: MarcoFalke

test/functional/test_framework/test_framework.py

@@ -12,6 +12,7 @@
 import pdb
 import random
 import shutil
+import subprocess
 import sys
 import tempfile
 import time
@@ -121,6 +122,9 @@ def main(self):
         except KeyError:
             self.log.exception("Key error")
             self.success = TestStatus.FAILED
+        except subprocess.CalledProcessError as e:
+            self.log.exception("Called Process failed with '{}'".format(e.output))
+            self.success = TestStatus.FAILED
         except Exception:
             self.log.exception("Unexpected exception caught during testing")
             self.success = TestStatus.FAILED