As of 8/11/2020, all PRCs flying from Singapore to China will be required to do tests 2 days before boarding.
For more information, please do visit https://www.mom.gov.sg/covid-19/sending-workers-home and http://www.chinaembassy.org.sg/chn/lsfw/zytzs/t1829089.htm.
Hope all of you have a good week ahead! :)