diff --git a/tests/__init__.py b/tests/__init__.py
index e69de29b..3aa487dd 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -0,0 +1,97 @@
+import re
+from xml.dom.minidom import Node, parseString
+
+
+def strip_quotes(want, got):
+    """
+    Strip quotes of doctests output values:
+    >>> strip_quotes("'foo'")
+    "foo"
+    >>> strip_quotes('"foo"')
+    "foo"
+    """
+    def is_quoted_string(s):
+        s = s.strip()
+        return (len(s) >= 2
+                and s[0] == s[-1]
+                and s[0] in ('"', "'"))
+
+    def is_quoted_unicode(s):
+        s = s.strip()
+        return (len(s) >= 3
+                and s[0] == 'u'
+                and s[1] == s[-1]
+                and s[1] in ('"', "'"))
+
+    if is_quoted_string(want) and is_quoted_string(got):
+        want = want.strip()[1:-1]
+        got = got.strip()[1:-1]
+    elif is_quoted_unicode(want) and is_quoted_unicode(got):
+        want = want.strip()[2:-1]
+        got = got.strip()[2:-1]
+    return want, got
+
+
+def compare_xml(want, got):
+    """Tries to do a 'xml-comparison' of want and got.  Plain string
+    comparison doesn't always work because, for example, attribute
+    ordering should not be important. Comment nodes are not considered in the
+    comparison.
+    Based on http://codespeak.net/svn/lxml/trunk/src/lxml/doctestcompare.py
+    """
+    _norm_whitespace_re = re.compile(r'[ \t\n][ \t\n]+')
+
+    def norm_whitespace(v):
+        return _norm_whitespace_re.sub(' ', v)
+
+    def child_text(element):
+        return ''.join(c.data for c in element.childNodes
+                       if c.nodeType == Node.TEXT_NODE)
+
+    def children(element):
+        return [c for c in element.childNodes
+                if c.nodeType == Node.ELEMENT_NODE]
+
+    def norm_child_text(element):
+        return norm_whitespace(child_text(element))
+
+    def attrs_dict(element):
+        return dict(element.attributes.items())
+
+    def check_element(want_element, got_element):
+        if want_element.tagName != got_element.tagName:
+            return False
+        if norm_child_text(want_element) != norm_child_text(got_element):
+            return False
+        if attrs_dict(want_element) != attrs_dict(got_element):
+            return False
+        want_children = children(want_element)
+        got_children = children(got_element)
+        if len(want_children) != len(got_children):
+            return False
+        for want, got in zip(want_children, got_children):
+            if not check_element(want, got):
+                return False
+        return True
+
+    def first_node(document):
+        for node in document.childNodes:
+            if node.nodeType != Node.COMMENT_NODE:
+                return node
+
+    want, got = strip_quotes(want, got)
+    want = want.replace('\\n', '\n')
+    got = got.replace('\\n', '\n')
+
+    # If the string is not a complete xml document, we may need to add a
+    # root element. This allow us to compare fragments, like "<foo/><bar/>"
+    if not want.startswith('<?xml'):
+        wrapper = '<root>%s</root>'
+        want = wrapper % want
+        got = wrapper % got
+
+    # Parse the want and got strings, and compare the parsings.
+    want_root = first_node(parseString(want))
+    got_root = first_node(parseString(got))
+
+    return check_element(want_root, got_root)
diff --git a/tests/manager.py b/tests/manager.py
index d364a0d0..02d3ead6 100644
--- a/tests/manager.py
+++ b/tests/manager.py
@@ -16,9 +16,38 @@
 from xero import Xero
 from xero.manager import Manager
 from tests import mock_data
+from . import compare_xml
+from unittest.util import safe_repr
+import difflib
+import six
 
 
 class ManagerTest(unittest.TestCase):
+    maxDiff = None
+
+    def assertXMLEqual(self, xml1, xml2, msg=None):
+        """
+        Asserts that two XML snippets are semantically the same.
+        Whitespace in most cases is ignored, and attribute ordering is not
+        significant. The passed-in arguments must be valid XML.
+        """
+        try:
+            result = compare_xml(xml1, xml2)
+        except Exception as e:
+            standardMsg = 'First or second argument is not valid XML\n%s' % e
+            self.fail(self._formatMessage(msg, standardMsg))
+        else:
+            if not result:
+                standardMsg = '%s != %s' % (safe_repr(xml1, True), safe_repr(xml2, True))
+                diff = ('\n' + '\n'.join(
+                    difflib.ndiff(
+                        six.text_type(xml1).splitlines(),
+                        six.text_type(xml2).splitlines(),
+                    )
+                ))
+                standardMsg = self._truncateMessage(standardMsg, diff)
+                self.fail(self._formatMessage(msg, standardMsg))
+
     def test_serializer(self):
         credentials = Mock(base_url="")
         manager = Manager('contacts', credentials)
@@ -80,12 +109,87 @@ def test_serializer(self):
             <DueDate>2015-07-06 16:25:02.711136</DueDate>
         """
 
-        # @todo Need a py2/3 way to compare XML easily.
-        # self.assertEqual(
-        #     resultant_xml,
-        #     expected_xml,
-        #     "Failed to serialize data to XML correctly."
-        # )
+        self.assertXMLEqual(
+            resultant_xml,
+            expected_xml,
+        )
+
+
+    def test_serializer_phones_addresses(self):
+        credentials = Mock(base_url="")
+        manager = Manager('contacts', credentials)
+
+        example_contact_input = {
+            'ContactID': '565acaa9-e7f3-4fbf-80c3-16b081ddae10',
+            'ContactStatus': 'ACTIVE',
+            'Name': 'Southside Office Supplies',
+            'Addresses': [
+                {
+                    'AddressType': 'POBOX',
+                },
+                {
+                    'AddressType': 'STREET',
+                },
+            ],
+            'Phones': [
+                {
+                    'PhoneType': 'DDI',
+                },
+                {
+                    'PhoneType': 'DEFAULT',
+                },
+                {
+                    'PhoneType': 'FAX',
+                },
+                {
+                    'PhoneType': 'MOBILE',
+                },
+            ],
+            'UpdatedDateUTC': datetime.datetime(2015, 9, 18, 5, 6, 56, 893),
+            'IsSupplier': False,
+            'IsCustomer': False,
+            'HasAttachments': False,
+        }
+        resultant_xml = manager._prepare_data_for_save(example_contact_input)
+
+        expected_xml = """
+            <Contact>
+              <ContactID>565acaa9-e7f3-4fbf-80c3-16b081ddae10</ContactID>
+              <ContactStatus>ACTIVE</ContactStatus>
+              <Name>Southside Office Supplies</Name>
+              <Addresses>
+                <Address>
+                  <AddressType>POBOX</AddressType>
+                </Address>
+                <Address>
+                  <AddressType>STREET</AddressType>
+                </Address>
+              </Addresses>
+              <Phones>
+                <Phone>
+                  <PhoneType>DDI</PhoneType>
+                </Phone>
+                <Phone>
+                  <PhoneType>DEFAULT</PhoneType>
+                </Phone>
+                <Phone>
+                  <PhoneType>FAX</PhoneType>
+                </Phone>
+                <Phone>
+                  <PhoneType>MOBILE</PhoneType>
+                </Phone>
+              </Phones>
+              <UpdatedDateUTC>2015-09-18T05:06:56.893</UpdatedDateUTC>
+              <IsSupplier>false</IsSupplier>
+              <IsCustomer>false</IsCustomer>
+              <HasAttachments>false</HasAttachments>
+            </Contact>
+        """
+
+        self.assertXMLEqual(
+            resultant_xml,
+            expected_xml,
+        )
 
 
     def test_serializer_nested_singular(self):