diff --git a/lib/galaxy/tools/test.py b/lib/galaxy/tools/test.py
index a26f26fea9d..a4acd0f5ee2 100644
--- a/lib/galaxy/tools/test.py
+++ b/lib/galaxy/tools/test.py
@@ -131,7 +131,8 @@ def _process_raw_inputs(tool, tool_inputs, raw_inputs, required_files, parent_co
                 if isinstance(value, galaxy.tools.parameters.basic.DataToolParameter):
                     if not isinstance(param_value, list):
                         param_value = [param_value]
-                    map(lambda v: _add_uploaded_dataset(context.for_state(), v, param_extra, value, required_files), param_value)
+                    for v in param_value:
+                        _add_uploaded_dataset(context.for_state(), v, param_extra, value, required_files)
                     processed_value = param_value
                 elif isinstance(value, galaxy.tools.parameters.basic.DataCollectionToolParameter):
                     assert 'collection' in param_extra