Add base dumping/serialization mechanism.

tests/test_dom.py

@@ -1,10 +1,9 @@
 import logging
 import os
-import sys
 import unittest
 from datetime import datetime as DT
 
-from org_dom import load, loads
+from org_dom import dumps, load, loads
 from utils.dom_assertions import HL, Dom
 
 DIR = os.path.dirname(os.path.abspath(__file__))
@@ -37,3 +36,11 @@ class TestSerde(unittest.TestCase):
                      ])))
 
         ex.assert_matches(self, doc)
+
+    def test_mimic_write_file_01(self):
+        """A goal of this library is to be able to update a file without changing parts not directly modified."""
+        with open(os.path.join(DIR, '01-simple.org')) as f:
+            orig = f.read()
+            doc = loads(orig)
+
+        self.assertEqual(dumps(doc), orig)