tests/testthat/test-boolean_arithmetic_linter.R

In lintr: A 'Linter' for R Code

test_that("boolean_arithmetic_linter doesn't block allowed usages", {
  linter <- boolean_arithmetic_linter()

  expect_lint("!any(x == y)", NULL, linter)
  expect_lint("!any(grepl(pattern, x))", NULL, linter)
})

test_that("boolean_arithmetic_linter requires use of any() or !any()", {
  linter <- boolean_arithmetic_linter()
  lint_msg <- rex::rex("Use any() to express logical aggregations.")

  expect_lint("length(which(x == y)) == 0", lint_msg, linter)
  # anything passed to which() can be assumed to be logical
  expect_lint("length(which(is_treatment)) == 0L", lint_msg, linter)
  # regex version
  expect_lint("length(grep(pattern, x)) == 0", lint_msg, linter)
  # sum version
  expect_lint("sum(x == y) == 0L", lint_msg, linter)
  expect_lint("sum(grepl(pattern, x)) == 0", lint_msg, linter)

  # non-== comparisons
  expect_lint("length(which(x == y)) > 0L", lint_msg, linter)
  expect_lint("length(which(is_treatment)) < 1", lint_msg, linter)
  expect_lint("length(grep(pattern, x)) >= 1L", lint_msg, linter)
  expect_lint("sum(x == y) != 0", lint_msg, linter)
  expect_lint("sum(grepl(pattern, x)) > 0L", lint_msg, linter)
})