Fixes bug 888649

Change exception.VolumeIsBusy to derive from NovaException instead of
Error, so that an 'unexpected keyword' exception is not thrown when
the exception is raised with keyword parameters.

Add unit test to confirm that the 'unexpected keyword' exception is not
thrown when the exception is raised by nova.volume.driver.VolumeDriver

Responded to reviewer observations, fix pep8 errors in tset_volume.py,
added email address to Authors file.

Change-Id: I15464cb0cf72a2c71f430e4c8c5c2b27cd4e2ef9

2 files changed, 29 insertions, 1 deletions

diff --git a/nova/exception.py b/nova/exception.py
index 78a888faa..c6e08824b 100644
--- a/nova/exception.py
+++ b/nova/exception.py
@@ -396,7 +396,7 @@ class SnapshotNotFound(NotFound):
     message = _("Snapshot %(snapshot_id)s could not be found.")
 
 
-class VolumeIsBusy(Error):
+class VolumeIsBusy(NovaException):
     message = _("deleting volume %(volume_name)s that has snapshot")
 
 
diff --git a/nova/tests/test_volume.py b/nova/tests/test_volume.py
index 588b7a328..6c81facf8 100644
--- a/nova/tests/test_volume.py
+++ b/nova/tests/test_volume.py
@@ -294,6 +294,34 @@ class DriverTestCase(test.TestCase):
             self.volume.delete_volume(self.context, volume_id)
 
 
+class VolumeDriverTestCase(DriverTestCase):
+    """Test case for VolumeDriver"""
+    driver_name = "nova.volume.driver.VolumeDriver"
+
+    def setUp(self):
+        super(VolumeDriverTestCase, self).setUp()
+
+    def tearDown(self):
+        super(VolumeDriverTestCase, self).tearDown()
+
+    def test_delete_busy_volume(self):
+        """Test deleting a busy volume."""
+        self.stubs.Set(self.volume.driver, '_volume_not_present',
+                       lambda x: False)
+        self.stubs.Set(self.volume.driver, '_delete_volume',
+                       lambda x, y: False)
+        # Want DriverTestCase._fake_execute to return 'o' so that
+        # volume.driver.delete_volume() raises the VolumeIsBusy exception.
+        self.output = 'o'
+        self.assertRaises(exception.VolumeIsBusy,
+                          self.volume.driver.delete_volume,
+                          {'name': 'test1', 'size': 1024})
+        # when DriverTestCase._fake_execute returns something other than
+        # 'o' volume.driver.delete_volume() does not raise an exception.
+        self.output = 'x'
+        self.volume.driver.delete_volume({'name': 'test1', 'size': 1024})
+
+
 class ISCSITestCase(DriverTestCase):
     """Test Case for ISCSIDriver"""
     driver_name = "nova.volume.driver.ISCSIDriver"