Funding for this research was provided by:
Education and Scientific Research Project of Fujian Province (JT180436)
Xiamen Science and Technology Planning Project (3502Z20183058)
Open Fund of Engineering Research Center for Software Testing and Evaluation of Fujian Province
Article History
Received: 13 February 2018
Revised: 24 December 2018
Accepted: 22 January 2019
First Online: 7 February 2019