R Under development (unstable) (2024-06-18 r86781 ucrt) -- "Unsuffered Consequences"
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> if (.Platform$OS.type != "windows") {
+     library(lme4)
+     fm1 <- lmer(Reaction ~ Days + (Days|Subject), sleepstudy)
+     stopifnot(isREML(fm1),
+               isLMM(fm1),
+               !isGLMM(fm1),
+               !isNLMM(fm1))
+ 
+     fm1ML <- refitML(fm1)
+     stopifnot(!isREML(fm1ML),
+               isLMM(fm1ML),
+               !isGLMM(fm1ML),
+               !isNLMM(fm1ML))
+ 
+     gm1 <- glmer(cbind(incidence, size - incidence) ~ period + (1 | herd),
+                  data = cbpp, family = binomial)
+     stopifnot(!isREML(gm1),
+               !isLMM(gm1),
+               isGLMM(gm1),
+               !isNLMM(gm1))
+ 
+     nm1 <- nlmer(circumference ~ SSlogis(age, Asym, xmid, scal) ~ Asym|Tree,
+                  Orange, start = c(Asym = 200, xmid = 725, scal = 350))
+     stopifnot(!isREML(nm1),
+               !isLMM(nm1),
+               !isGLMM(nm1),
+               isNLMM(nm1))
+ 
+ 
+ } ## skip on windows (for speed)
> 
> proc.time()
   user  system elapsed 
   0.12    0.07    0.14