Nothing
#' Require usage of `expect_named(x, n)` over `expect_equal(names(x), n)`
#'
#' [testthat::expect_named()] exists specifically for testing the [names()] of
#' an object. [testthat::expect_equal()] can also be used for such tests,
#' but it is better to use the tailored function instead.
#'
#' @examples
#' # will produce lints
#' lint(
#' text = 'expect_equal(names(x), "a")',
#' linters = expect_named_linter()
#' )
#'
#' # okay
#' lint(
#' text = 'expect_named(x, "a")',
#' linters = expect_named_linter()
#' )
#'
#' lint(
#' text = 'expect_equal(colnames(x), "a")',
#' linters = expect_named_linter()
#' )
#'
#' lint(
#' text = 'expect_equal(dimnames(x), "a")',
#' linters = expect_named_linter()
#' )
#'
#' @evalRd rd_tags("expect_named_linter")
#' @seealso [linters] for a complete list of linters available in lintr.
#' @export
expect_named_linter <- function() {
xpath <- "
//SYMBOL_FUNCTION_CALL[text() = 'expect_equal' or text() = 'expect_identical']
/parent::expr
/following-sibling::expr[
expr[1][SYMBOL_FUNCTION_CALL[text() = 'names']]
and (position() = 1 or preceding-sibling::expr[STR_CONST])
]
/parent::expr
"
Linter(function(source_expression) {
if (!is_lint_level(source_expression, "expression")) {
return(list())
}
xml <- source_expression$xml_parsed_content
bad_expr <- xml_find_all(xml, xpath)
matched_function <- xp_call_name(bad_expr)
lint_message <- sprintf("expect_named(x, n) is better than %s(names(x), n)", matched_function)
xml_nodes_to_lints(bad_expr, source_expression = source_expression, lint_message, type = "warning")
})
}
Any scripts or data that you put into this service are public.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.