Fixed test cases

Signed-off-by: Chirayu Chiripal <chirayu.chiripal@gmail.com>
added missing unbind handler in teardown

Signed-off-by: Chirayu Chiripal <chirayu.chiripal@gmail.com>
improve test cases 1

Signed-off-by: Chirayu Chiripal <chirayu.chiripal@gmail.com>