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cca98b42 - UT refactor for preview (#1160)

UT refactor for preview (#1160) Signed-off-by: He, Xin3 <xin3.he@intel.com> Signed-off-by: n1ck-guo <heng.guo@intel.com> Co-authored-by: Sun, Xuehao <xuehao.sun@intel.com>