Add unit tests for backup commands in volume v1

There was not any unit tests for backup commands
in volume v1 so that sometimes some small bugs
maybe ignored, this patch add unit tests for them.

Change-Id: Ic67c1b80243f7b3d15dabd25e4e4a1b1517a8b59

Author: Huanxuan Ao

openstackclient/tests/unit/volume/v1/fakes.py

@@ -451,6 +451,10 @@ def __init__(self, **kwargs):
         self.transfers.resource_class = fakes.FakeResource(None, {})
         self.volume_snapshots = mock.Mock()
         self.volume_snapshots.resource_class = fakes.FakeResource(None, {})
+        self.backups = mock.Mock()
+        self.backups.resource_class = fakes.FakeResource(None, {})
+        self.restores = mock.Mock()
+        self.restores.resource_class = fakes.FakeResource(None, {})
         self.auth_token = kwargs['token']
         self.management_url = kwargs['endpoint']
 
@@ -624,3 +628,79 @@ def get_snapshots(snapshots=None, count=2):
             snapshots = FakeSnapshot.create_snapshots(count)
 
         return mock.Mock(side_effect=snapshots)
+
+
+class FakeBackup(object):
+    """Fake one or more backup."""
+
+    @staticmethod
+    def create_one_backup(attrs=None):
+        """Create a fake backup.
+
+        :param Dictionary attrs:
+            A dictionary with all attributes
+        :return:
+            A FakeResource object with id, name, volume_id, etc.
+        """
+        attrs = attrs or {}
+
+        # Set default attributes.
+        backup_info = {
+            "id": 'backup-id-' + uuid.uuid4().hex,
+            "name": 'backup-name-' + uuid.uuid4().hex,
+            "volume_id": 'volume-id-' + uuid.uuid4().hex,
+            "snapshot_id": 'snapshot-id' + uuid.uuid4().hex,
+            "description": 'description-' + uuid.uuid4().hex,
+            "object_count": None,
+            "container": 'container-' + uuid.uuid4().hex,
+            "size": random.randint(1, 20),
+            "status": "error",
+            "availability_zone": 'zone' + uuid.uuid4().hex,
+            "links": 'links-' + uuid.uuid4().hex,
+        }
+
+        # Overwrite default attributes.
+        backup_info.update(attrs)
+
+        backup = fakes.FakeResource(
+            info=copy.deepcopy(backup_info),
+            loaded=True)
+        return backup
+
+    @staticmethod
+    def create_backups(attrs=None, count=2):
+        """Create multiple fake backups.
+
+        :param Dictionary attrs:
+            A dictionary with all attributes
+        :param int count:
+            The number of backups to fake
+        :return:
+            A list of FakeResource objects faking the backups
+        """
+        backups = []
+        for i in range(0, count):
+            backup = FakeBackup.create_one_backup(attrs)
+            backups.append(backup)
+
+        return backups
+
+    @staticmethod
+    def get_backups(backups=None, count=2):
+        """Get an iterable MagicMock object with a list of faked backups.
+
+        If backups list is provided, then initialize the Mock object with the
+        list. Otherwise create one.
+
+        :param List volumes:
+            A list of FakeResource objects faking backups
+        :param Integer count:
+            The number of backups to be faked
+        :return
+            An iterable Mock object with side_effect set to a list of faked
+            backups
+        """
+        if backups is None:
+            backups = FakeBackup.create_backups(count)
+
+        return mock.Mock(side_effect=backups)