if !partNeedsHealing(dataErrsPerDisk[diskIndex]) {
				t.Errorf("Disk expected to be healed, driveIndex: %d", diskIndex)
			}
		} else {
			if disk == nil {
				t.Errorf("Drive erroneously filtered, driveIndex: %d", diskIndex)
			}
			if partNeedsHealing(dataErrsPerDisk[diskIndex]) {
				t.Errorf("Disk not expected to be healed, driveIndex: %d", diskIndex)
			}

		}
	}
}

func TestCommonParities(t *testing.T) {