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Jointly testing several parameters of factor variable

Stijn Ruiter 
Hi all,
I am estimating a lmer model and now I would like to test whether some
coefficients for specific levels of factor variable are equal.
I am thinking of either:
(1) applying equality constraints on several parameters for specific
levels of a factor variable (and use that to do LRT against model
without equality constraints), but I have no clue on how to that; or
(2) do a Wald test in which several parameter estimates of a factor
variable are jointly tested. Although I noticed "wald.test" from the
"aod" package, but I don't quite follow how to apply that to my lmer model.

Any suggestions on how to jointly test several parameters of a lmer
model (preferably applied to factor variables)?

Stijn