Add test for format of numbering level without explicit format

Author: mwilliamson

tests/docx/numbering_xml_tests.py

@@ -34,11 +34,27 @@ def test_list_is_not_ordered_if_formatted_as_bullet():
     numbering = _read_numbering_xml_element(_sample_numbering_xml)
     assert_equal(False, numbering.find_level("47", "0").is_ordered)
 
+
 def test_list_is_ordered_if_formatted_as_decimal():
     numbering = _read_numbering_xml_element(_sample_numbering_xml)
     assert_equal(True, numbering.find_level("47", "1").is_ordered)
 
 
+def test_list_is_ordered_if_there_is_no_explicit_format():
+    element = xml_element("w:numbering", {}, [
+        xml_element("w:abstractNum", {"w:abstractNumId": "42"}, [
+            xml_element("w:lvl", {"w:ilvl": "0"}),
+        ]),
+        xml_element("w:num", {"w:numId": "47"}, [
+            xml_element("w:abstractNumId", {"w:val": "42"})
+        ])
+    ])
+
+    numbering = _read_numbering_xml_element(element)
+
+    assert_equal(True, numbering.find_level("47", "0").is_ordered)
+
+
 def test_find_level_returns_none_if_level_cannot_be_found():
     numbering = _read_numbering_xml_element(_sample_numbering_xml)
     assert_equal(None, numbering.find_level("47", "2"))