Add Exprb test

Author: YingboMa

test/jacvec_operators.jl

@@ -58,6 +58,7 @@ for ff in [ff1, ff2]
   prob = ODEProblem(ff,u0,tspan)
   @test solve(prob,TRBDF2()).retcode == :Success
   @test solve(prob,TRBDF2(linsolve=LinSolveGMRES(tol=1e-10))).retcode == :Success
+  @test solve(prob,Exprb32()).retcode == :Success
   @test_broken sol = solve(prob,Rosenbrock23())
   @test_broken sol = solve(prob,Rosenbrock23(linsolve=LinSolveGMRES(tol=1e-10)))
 end