pythoningLearning
diff --git a/‎opc/package.py‎
Lines changed: 21 additions & 0 deletions b/‎opc/package.py‎
Lines changed: 21 additions & 0 deletions
diff --git a/‎tests/test_package.py‎
Lines changed: 12 additions & 0 deletions b/‎tests/test_package.py‎
Lines changed: 12 additions & 0 deletions
@@ -11,6 +11,7 @@
 Provides an API for manipulating Open Packaging Convention (OPC) packages.
 """
 
+from opc.packuri import PACKAGE_URI
 from opc.pkgreader import PackageReader
 
 
@@ -20,6 +21,10 @@ class OpcPackage(object):
     the :meth:`open` class method with a path to a package file or file-like
     object containing one.
     """
+    def __init__(self):
+        super(OpcPackage, self).__init__()
+        self._rels = RelationshipCollection(PACKAGE_URI.baseURI)
+
     @staticmethod
     def open(pkg_file):
         """
@@ -31,6 +36,14 @@ def open(pkg_file):
         Unmarshaller.unmarshal(pkg_reader, pkg, PartFactory)
         return pkg
 
+    @property
+    def rels(self):
+        """
+        Return a reference to the |RelationshipCollection| holding the
+        relationships for this package.
+        """
+        return self._rels
+
 
 class Part(object):
     """
@@ -86,6 +99,14 @@ def __new__(cls, partname, content_type, blob):
         return Part(partname, content_type, blob)
 
 
+class RelationshipCollection(object):
+    """
+    Collection object for |_Relationship| instances, having list semantics.
+    """
+    def __init__(self, baseURI):
+        super(RelationshipCollection, self).__init__()
+
+
 class Unmarshaller(object):
     """
     Hosts static methods for unmarshalling a package from a |PackageReader|
 
@@ -14,10 +14,16 @@
 from mock import call, Mock
 
 from opc.package import OpcPackage, Part, PartFactory, Unmarshaller
+from opc.packuri import PACKAGE_URI
 
 from .unitutil import class_mock, method_mock
 
 
+@pytest.fixture
+def RelationshipCollection_(request):
+    return class_mock('opc.package.RelationshipCollection', request)
+
+
 class DescribeOpcPackage(object):
 
     @pytest.fixture
@@ -45,6 +51,12 @@ def it_can_open_a_pkg_file(self, PackageReader_, PartFactory_,
                                                         PartFactory_)
         assert isinstance(pkg, OpcPackage)
 
+    def it_initializes_its_rels_collection_on_construction(
+            self, RelationshipCollection_):
+        pkg = OpcPackage()
+        RelationshipCollection_.assert_called_once_with(PACKAGE_URI.baseURI)
+        assert pkg.rels == RelationshipCollection_.return_value
+
 
 class DescribePart(object):