Bugfix: QA: test_node: Ensure debug.log exists at start of assert_debug_log

Author: luke-jr

test/functional/test_framework/test_node.py

@@ -451,6 +451,12 @@ def assert_debug_log(self, expected_msgs, unexpected_msgs=None, timeout=2):
         assert_equal(type(expected_msgs), list)
         assert_equal(type(unexpected_msgs), list)
 
+        if not self.debug_log_path.exists():
+            # File must exist for this to work
+            os.makedirs(self.debug_log_path.parent, exist_ok=True)
+            with open(self.debug_log_path, mode='a', encoding='utf-8'):
+                pass
+
         time_end = time.time() + timeout * self.timeout_factor
         prev_size = self.debug_log_size(encoding="utf-8")  # Must use same encoding that is used to read() below