Nothing
cleaned <- clean_colnames(c(".title...", "X..YEAR",
"authors..", ".AUTHOR"))
expect(!any(grepl("[[:punct::]]", cleaned)), "Punctuation not removed from names")
expect(!any(duplicated(cleaned)), "Duplicated names not cleaned")
expect(!any(grepl("^(X|Y|Z)\\.+", cleaned)), "Leading X not removed from names")
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