Recursively check for errors/failures in produced JUnit result XMLs

Signed-off-by: Nick Morales <ngmorales97@gmail.com>

ament_cmake_test/ament_cmake_test/__init__.py

@@ -304,10 +304,7 @@ def log(msg, **kwargs):
             rc = 1
         else:
             # set error code when result file contains errors or failures
-            root = tree.getroot()
-            num_errors = int(root.attrib.get('errors', 0))
-            num_failures = int(root.attrib.get('failures', 0))
-            if num_errors or num_failures:
+            if _check_for_failure(tree):
                 rc = 1
 
     # ensure that a result file exists at the end
@@ -318,6 +315,21 @@ def log(msg, **kwargs):
 
     return rc
 
+def _check_for_failure(tree):
+    # Check tree for failures in nodes
+    root = tree.getroot()
+    return _check_for_failure_recursive(root)
+
+def _check_for_failure_recursive(node):
+    # Recursively check node and subnodes for test error or failure
+    if (int(node.attrib.get('errors', 0))) or (int(node.attrib.get('failures', 0))):
+        return True
+
+    for child in node:
+        if _check_for_failure_recursive(child):
+            return True
+
+    return False
 
 def _generate_result(result_file, *, failure_message=None, skip=False,
                      error_message=None, test_time=0):