Type ssc install suest, replace to download the ado file. It will be saved as D:\stata15\ado\plus\suest.ado.
You can open the adofile and rename it as suest2.ado.
. webuse nlswork.dta, clear
. xtset idcode year
. xtreg ln_wage hours i.year if union==1, fe
. est store m1
. xtreg ln_wage hours i.year if union==0, fe
. est store m0
. suest2 m1 m0
. test [m1_mean]hours=[m0_mean]hours