add doc str test

Author: DimmaDont

tests/test_items.py

@@ -308,6 +308,7 @@ def test_array_behaves_like_a_list():
     content = """a = [1, 2,] # Comment
 """
     doc = parse(content)
+    assert str(doc) == "{'a': [1, 2]}"
     assert str(doc["a"]) == "[1, 2]"
 
     assert doc["a"] == [1, 2]