R Under development (unstable) (2025-04-19 r88162 ucrt) -- "Unsuffered Consequences"
Copyright (C) 2025 The R Foundation for Statistical Computing
Platform: x86_64-w64-mingw32/x64

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.

R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.

> NAME <- "methods"
> source(file.path('_helper', 'init.R'))
> 
> # try implementing methods that change default behavior outside of package
> 
> # - Force unified --------------------------------------------------------------
> 
> par.env <- new.env()
> local(
+   envir=par.env, {
+   suppressWarnings(
+     setClass(
+       "testdiffobj", slots=c(a="integer"), where=par.env
+   ) )
+   # First check that we do actually output in side by side mode
+ 
+   print(
+     all.equal(
+       as.character(diffObj(new("testdiffobj", a=1L), new("testdiffobj", a=2L))),
+       rdsf(100)
+   ) )
+   # Now verify that with our new method, we get unified
+ 
+   setMethod("diffObj", c("testdiffobj", "testdiffobj"),
+     function(target, current, ...) {
+       dots <- match.call(expand.dots=FALSE)[["..."]]
+       if("mode" %in% names(dots))
+         callNextMethod()
+       else
+         callNextMethod(target=target, current=current, ..., mode="unified")
+     },
+     where=par.env
+   )
+   on.exit(
+     removeMethod("diffObj", c("testdiffobj", "testdiffobj"), where=par.env)
+   )
+   print(
+     all.equal(
+       as.character(diffObj(new("testdiffobj", a=1L), new("testdiffobj", a=2L))),
+       rdsf(200)
+     ) )
+   # Make sure we can still get side by side?
+   print(
+     all.equal(
+       as.character(
+         diffObj(
+           new("testdiffobj", a=1L), new("testdiffobj", a=2L), mode="sidebyside"
+       ) ),
+       rdsf(100)
+   ) )
+   try( #"Argument `mode` must be"
+     diffObj(new("testdiffobj", a=1L), new("testdiffobj", a=2L), mode="hello")
+   )
+ })
[1] TRUE
[1] TRUE
[1] TRUE
Error in diffObj(target = new("testdiffobj", a = 1L), current = new("testdiffobj",  : 
  Error in calling `diffStr`: Argument `mode` must be character(1L) and in `c("auto", "unified", "context", "sidebyside")`.
> 
> proc.time()
   user  system elapsed 
   0.95    0.21    1.54