test: Print both messages on failure in assert_raises_message

Author: MarcoFalke

test/functional/test_framework/util.py

@@ -56,7 +56,9 @@ def assert_raises_message(exc, message, fun, *args, **kwds):
         raise AssertionError("Use assert_raises_rpc_error() to test RPC failures")
     except exc as e:
         if message is not None and message not in e.error['message']:
-            raise AssertionError("Expected substring not found:" + e.error['message'])
+            raise AssertionError(
+                "Expected substring not found in error message:\nsubstring: '{}'\nerror message: '{}'.".format(
+                    message, e.error['message']))
     except Exception as e:
         raise AssertionError("Unexpected exception raised: " + type(e).__name__)
     else:
@@ -116,7 +118,9 @@ def try_rpc(code, message, fun, *args, **kwds):
         if (code is not None) and (code != e.error["code"]):
             raise AssertionError("Unexpected JSONRPC error code %i" % e.error["code"])
         if (message is not None) and (message not in e.error['message']):
-            raise AssertionError("Expected substring not found:" + e.error['message'])
+            raise AssertionError(
+                "Expected substring not found in error message:\nsubstring: '{}'\nerror message: '{}'.".format(
+                    message, e.error['message']))
         return True
     except Exception as e:
         raise AssertionError("Unexpected exception raised: " + type(e).__name__)