R Under development (unstable) (2023-11-02 r85465 ucrt) -- "Unsuffered Consequences"
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> if (.Platform$OS.type != "windows") withAutoprint({
+     library("lme4")
+ 
+     ## example from HSAUR2 package; data from 'multcomp'; see ../inst/testdata/trees513.R
+     load(system.file("testdata","trees513.RData",package="lme4"))
+ 
+     ## model formula:
+     modForm <- damage ~ species - 1 + (1 | lattice / plot)
+ 
+     dfun <- glmer(modForm, data = trees513B, family = binomial,
+                   devFunOnly = TRUE)
+     ls.str(environment(dfun))# "for your information"
+ 
+     .not.call <- function(x) x[names(x) != "call"]
+ 
+     if(lme4:::testLevel() < 2) q("no")
+     ## else  (testLevel >= 2) : --------------------------------------------------
+ 
+     ## Generate oldres:
+     ## ----------------
+     ## library(lme4.0)
+     ## system.time(mmod0 <- glmer(damage ~ species - 1 + (1 | lattice / plot),
+     ##               data = trees513, family = binomial()))
+     ## ## 4 seconds
+     ## oldres <- c(fixef(mmod0),getME(mmod0,"theta"))
+     ## detach("package:lme4.0")
+     ## dput(oldres)
+     oldres <- structure(c(5.23645064474105, 4.73568475545248, 2.65289926317093,
+                           1.29043984816924, 1.59329381563025,
+                           0.532663142106669, 1.16703186884403
+                           ), .Names = c("speciesspruce", "speciespine",
+                                         "speciesbeech",
+                                         "speciesoak", "specieshardwood",
+                                         "plot:lattice.(Intercept)",
+                                         "lattice.(Intercept)"))
+     system.time(mmodA <- glmer(modForm, data = trees513A, family = binomial()))
+     ## 7 seconds
+     newres <- c(fixef(mmodA), getME(mmodA,"theta"))
+     stopifnot(all.equal(oldres, newres, tolerance=1.5e-3))
+     system.time(mmodB <- glmer(modForm, data = trees513B, family = binomial()))
+     ## 10.4 seconds
+     ##
+     if(FALSE) { ## defuncted in 2019-05 [been deprecated since 2013-06]
+         ## lmer( + family) -> diverts to glmer() with a warning [TODO: use assertWarning(.) eventually]
+         system.time(lmodB <-
+                         lmer(modForm, data = trees513B, family = binomial()))
+         stopifnot(all.equal(.not.call(summary(mmodB)),
+                             .not.call(summary(lmodB))))
+         newresB <- c(fixef(mmodB),getME(mmodB,"theta"))
+         stopifnot(length(newresB) == length(oldres) + 1)# extra: species[ash/maple/elm/lime]
+     }
+ 
+ 
+ }) ## skip on windows (for speed)
> 
> proc.time()
   user  system elapsed 
   0.17    0.04    0.18