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test_that("length_levels_linter skips allowed usages", {
expect_lint("length(c(levels(x), 'a'))", NULL, length_levels_linter())
})
test_that("length_levels_linter blocks simple disallowed usages", {
expect_lint(
"2:length(levels(x))",
rex::rex("nlevels(x) is better than length(levels(x))."),
length_levels_linter()
)
})
test_that("lints vectorize", {
lint_msg <- rex::rex("nlevels(x) is better than length(levels(x)).")
expect_lint(
trim_some("{
length(levels(x))
length(levels(y))
}"),
list(
list(lint_msg, line_number = 2L),
list(lint_msg, line_number = 3L)
),
length_levels_linter()
)
})
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