test_that("Basic rules work", {

  # basic version of rule
  expect_equal(unclass(rule(mpg > 10)),
               list(name = "Rule for: mpg", expr = "mpg > 10", allow_na = FALSE,
                    negate = FALSE))
  # expression can be given as a string as well
  expect_equal(unclass(rule("mpg > 10")),
               list(name = "Rule for: mpg", expr = "mpg > 10", allow_na = FALSE,
                    negate = FALSE))

  # additional information is carried along as well
  expect_equal(unclass(rule(mpg > 10, author = "me", date = Sys.Date())),
               list(name = "Rule for: mpg", expr = "mpg > 10", allow_na = FALSE,
                    negate = FALSE, author = "me", date = Sys.Date()))

  # rules can span multiple lines and do not throw a warning!
  r <- rule(mpg > 10 &
              cyl %in% c(4, 6, 8) |
              disp > 10)
  expect_equal(r$expr, "mpg > 10 & cyl %in% c(4, 6, 8) | disp > 10")
})


test_that("get_symbols works as expected", {
  f <- function(x) deparse(substitute(x))
  get_symbols <- dataverifyr:::get_symbols

  expect_equal(get_symbols(f(mpg > 10)), "mpg")

  expect_equal(
    get_symbols(f(mpg > 10 & mpg <= 123 | is.na(cyl) & as.numeric(wt) > qsec)),
    c("mpg", "cyl", "wt", "qsec")
  )
})