R Under development (unstable) (2024-02-29 r86017 ucrt) -- "Unsuffered Consequences"
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> assert_valid_alphabet <- seguid:::assert_valid_alphabet
> assert_in_alphabet <- seguid:::assert_in_alphabet
> assert_alphabet <- seguid:::assert_alphabet
> 
> seq <- "ABCDEFGH"
> alphabet <- c("A", "C", "G", "T")
> 
> assert_valid_alphabet(alphabet)
> res <- tryCatch({
+   assert_valid_alphabet("!")
+ }, error = identity)
> stopifnot(inherits(res, "error"))
> 
> assert_in_alphabet("ACGT", alphabet = alphabet)
> assert_in_alphabet("AAAA", alphabet = alphabet)
> assert_in_alphabet("", alphabet = alphabet)
[1] ""
> 
> res <- tryCatch({
+   assert_in_alphabet("x", alphabet = alphabet)
+ }, error = identity)
> stopifnot(inherits(res, "error"))
> 
> res <- tryCatch({
+   assert_in_alphabet("ACGTx", alphabet = alphabet)
+ }, error = identity)
> stopifnot(inherits(res, "error"))
> 
> 
> 
> alphabet <- c(G = "C", A = "T", T = "A", C = "G")
> assert_alphabet(alphabet)
> 
> res <- tryCatch({
+   alphabet <- c(G = "C", A = "T", T = "A", x = "G")
+   assert_alphabet(alphabet)
+ }, error = identity)
> stopifnot(inherits(res, "error"))
> 
> proc.time()
   user  system elapsed 
   0.20    0.09    0.25