R Under development (unstable) (2023-11-01 r85459 ucrt) -- "Unsuffered Consequences"
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> if (.Platform$OS.type!="windows") {
+     library(lme4)
+ 
+     ## ----------------------------------------------------------------------
+     ## test that deviance(REMLfit, REML = FALSE) gives the same answer as
+     ## the ML objective function at the REML fit
+     ## ----------------------------------------------------------------------
+     set.seed(1)
+     w <- runif(nrow(sleepstudy))
+     fm <- lmer(Reaction ~ Days + (Days | Subject),
+                sleepstudy, weights = w)
+     dfun <- update(fm, devFunOnly = TRUE, REML = FALSE)
+     stopifnot(all.equal(deviance(fm, REML = FALSE),
+                         dfun(getME(fm, "theta"))))
+ 
+     ## ----------------------------------------------------------------------
+     ## TODO: test the opposite case that deviance(MLfit, REML = TRUE)
+     ## gives the same answer as the REML objective function at the ML fit
+     ## ----------------------------------------------------------------------
+ }
> 
> proc.time()
   user  system elapsed 
   0.12    0.01    0.14