Add test for proper nesting in process_keys

and a unit test for https://github.com/galaxyproject/galaxy/issues/7048

test/unit/tools/test_parameter_parsing.py

@@ -3,10 +3,34 @@ from xml.etree.ElementTree import XML
 
 from galaxy import model
 from galaxy.tools.parameters import basic
+from galaxy.tools.parameters.meta import process_key
 from galaxy.util import bunch
 from ..tools_support import UsesApp
 
 
+def test_process_key():
+    nested_dict = {}
+    d = {
+        'repeat_0|inner_repeat_0|data_table_column_value': u'bla',
+        'repeat_1|inner_repeat_1|data_table_column_value': u'bla2',
+    }
+    for key, value in d.items():
+        process_key(key, value, nested_dict)
+    assert len(nested_dict) == 1
+
+
+def test_process_key_2():
+    nested_dict = {}
+    d = {
+        'data_tables_0|columns_0|data_table_column_value': 'Amel_HAv3.1',
+        'data_tables': [],
+        'directory_content': [],
+    }
+    for key, value in d.items():
+        process_key(key, value, nested_dict)
+    assert len(nested_dict) == 2
+
+
 class BaseParameterTestCase(TestCase, UsesApp):
 
     def setUp(self):