diff --git a/cddl/usr.sbin/zfsd/tests/zfsd_unittest.cc b/cddl/usr.sbin/zfsd/tests/zfsd_unittest.cc
--- a/cddl/usr.sbin/zfsd/tests/zfsd_unittest.cc
+++ b/cddl/usr.sbin/zfsd/tests/zfsd_unittest.cc
@@ -134,6 +134,7 @@
 	MOCK_CONST_METHOD0(PoolGUID, Guid());
 	MOCK_CONST_METHOD0(State, vdev_state());
 	MOCK_CONST_METHOD0(PhysicalPath, string());
+	MOCK_CONST_METHOD2(Name, string(zpool_handle_t * zhp, bool verbose));
 };
 
 MockVdev::MockVdev(nvlist_t *vdevConfig)
@@ -431,6 +432,8 @@
 		m_vdev = new MockVdev(m_vdevConfig);
 		ON_CALL(*m_vdev, GUID())
 		    .WillByDefault(::testing::Return(Guid(123)));
+		ON_CALL(*m_vdev, Name(::testing::_, ::testing::_))
+		    .WillByDefault(::testing::Return(string("/dev/da999")));
 		ON_CALL(*m_vdev, PoolGUID())
 		    .WillByDefault(::testing::Return(Guid(456)));
 		ON_CALL(*m_vdev, State())
diff --git a/cddl/usr.sbin/zfsd/vdev.h b/cddl/usr.sbin/zfsd/vdev.h
--- a/cddl/usr.sbin/zfsd/vdev.h
+++ b/cddl/usr.sbin/zfsd/vdev.h
@@ -130,7 +130,7 @@
 	nvlist_t		*Config()	const;
 	Vdev			 Parent();
 	Vdev			 RootVdev();
-	std::string		 Name(zpool_handle_t *, bool verbose)	const;
+	virtual std::string	 Name(zpool_handle_t *, bool verbose)	const;
 	bool			 IsSpare();
 	bool			 IsAvailableSpare()	const;
 	bool			 IsActiveSpare()	const;