python-openxml
diff --git a/‎opc/pkgreader.py‎
Lines changed: 17 additions & 0 deletions b/‎opc/pkgreader.py‎
Lines changed: 17 additions & 0 deletions
diff --git a/‎tests/test_pkgreader.py‎
Lines changed: 20 additions & 0 deletions b/‎tests/test_pkgreader.py‎
Lines changed: 20 additions & 0 deletions
@@ -67,6 +67,9 @@ def _srels_for(phys_reader, source_uri):
         Return |_SerializedRelationshipCollection| instance populated with
         relationships for source identified by *source_uri*.
         """
+        rels_xml = phys_reader.rels_xml_for(source_uri)
+        return _SerializedRelationshipCollection.load_from_xml(
+            source_uri.baseURI, rels_xml)
 
     @staticmethod
     def _walk_phys_parts(phys_reader, srels, visited_partnames=None):
@@ -111,3 +114,17 @@ class _SerializedPart(object):
     """
     def __init__(self, partname, content_type, blob, srels):
         super(_SerializedPart, self).__init__()
+
+
+class _SerializedRelationshipCollection(object):
+    """
+    Read-only sequence of |_SerializedRelationship| instances corresponding
+    to the relationships item XML passed to constructor.
+    """
+    @staticmethod
+    def load_from_xml(baseURI, rels_item_xml):
+        """
+        Return |_SerializedRelationshipCollection| instance loaded with the
+        relationships contained in *rels_item_xml*. Returns an empty
+        collection if *rels_item_xml* is |None|.
+        """
@@ -43,6 +43,11 @@ def PhysPkgReader_(self, request):
     def _SerializedPart_(self, request):
         return class_mock('opc.pkgreader._SerializedPart', request)
 
+    @pytest.fixture
+    def _SerializedRelationshipCollection_(self, request):
+        return class_mock('opc.pkgreader._SerializedRelationshipCollection',
+                          request)
+
     @pytest.fixture
     def _srels_for(self, request):
         return method_mock(PackageReader, '_srels_for', request)
@@ -155,3 +160,18 @@ def it_can_walk_phys_pkg_parts(self, _srels_for):
             (partname_3, part_3_blob, part_3_srels),
         ]
         assert generated_tuples == expected_tuples
+
+    def it_can_retrieve_srels_for_a_source_uri(
+            self, _SerializedRelationshipCollection_):
+        # mockery ----------------------
+        phys_reader = Mock(name='phys_reader')
+        source_uri = Mock(name='source_uri')
+        rels_xml = phys_reader.rels_xml_for.return_value
+        load_from_xml = _SerializedRelationshipCollection_.load_from_xml
+        srels = load_from_xml.return_value
+        # exercise ---------------------
+        retval = PackageReader._srels_for(phys_reader, source_uri)
+        # verify -----------------------
+        phys_reader.rels_xml_for.assert_called_once_with(source_uri)
+        load_from_xml.assert_called_once_with(source_uri.baseURI, rels_xml)
+        assert retval == srels