R Under development (unstable) (2023-07-03 r84633 ucrt) -- "Unsuffered Consequences"
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> if (lme4:::testLevel() > 1 || .Platform$OS.type != "windows") withAutoprint({
+     library("lme4")
+     library("testthat")
+ 
+     L <- load(system.file("testdata", "lme-tst-fits.rda",
+                           package="lme4", mustWork=TRUE))
+     ## -> "fit_*" objects
+ 
+     fm1 <- fit_sleepstudy_2
+     c0  <- confint(fm1, method="Wald")
+     c0B <- confint(fm1, method="Wald",parm="Days")
+     expect_equal(c0["Days",],c0B["Days",])
+     expect_equal(c(c0B),c(7.437592,13.496980),tolerance=1e-6)
+     set.seed(101)
+ 
+     for (bt in c("norm", "basic", "perc")) {
+         suppressWarnings(
+             confint(fm1, method="boot", boot.type=bt, nsim=10,quiet=TRUE))
+     }
+     for (bt in c("stud","bca","junk")) {
+         expect_error(confint(fm1, method="boot", boot.type=bt, nsim=10),
+                      "should be one of")
+     }
+     if((testLevel <- lme4:::testLevel()) > 1) {
+         pr1.56 <- profile(fm1, which = 5:6)
+         c1 <- confint(pr1.56, method="profile")
+         expect_equal(c0[5:6,],c1,tolerance=2e-3)  ## expect Wald and profile _reasonably_ close
+         print(c1,digits=3)
+         ##
+         c6 <- confint(pr1.56, "Days")
+         expect_equal(c1[2, , drop=FALSE], c6)
+         c2  <- confint(fm1,method="boot",nsim=50,parm=5:6)
+         ## expect_error(confint(fm1,method="boot",nsim=50,parm="Days"),
+         ##  "must be specified as an integer")
+         expect_equal(c1,c2,tolerance=2e-2)
+         print(c2,digits=3)
+     }
+     if (testLevel > 10) {
+         print(c1B <- confint(fm1, method="profile"))
+         print(c2B <- confint(fm1, method="boot"))
+         expect_equal(unname(c1B), unname(c2B), tolerance=2e-2)
+     }
+ }) ## skip if windows/testLevel<1
> 
> proc.time()
   user  system elapsed 
   1.14    0.14    1.28