test_that("perform_checks produces warnings unless overriden", {
  sample_rules <- list(
    positive = function(pos, ...) {
      ifelse(pos > 0, "", "Not positive")
    },
    negative = function(neg, ...) {
      ifelse(neg < 0, "", "Not negative")
    },
    zero = function(z, ...) {
      ifelse(z == 0, "", "Not zero")
    }
  )

  expect_warning(res <- perform_checks(sample_rules, pos = -1, neg = -1, z = 0),
                 regexp = "positive")
  names(res) <- NULL
  expect_equal(res, c("F", "P", "P"))
  perform_checks(sample_rules, pos = -1, neg = -1, z = 0,
                 override = "positive")
  expect_warning(res <- perform_checks(sample_rules, pos = 1, neg = 1, z = 0),
                 regexp = "negative")
  names(res) <- NULL
  expect_equal(res, c("P", "F", "P"))
  perform_checks(sample_rules, pos = 1, neg = 1, z = 0,
                 override = "negative")
  expect_warning(res <- perform_checks(sample_rules, pos = 1, neg = -1, z = 1),
                 regexp = "zero")
  names(res) <- NULL
  expect_equal(res, c("P", "P", "F"))
  perform_checks(sample_rules, pos = 1, neg = -1, z = 1,
                 override = "zero")

  # should produce no warnings
  perform_checks(sample_rules, pos = 1, neg = -1, z = 0)
})

test_that("Messages are created for missing parameters", {
  sample_rules <- list(
    positive = function(pos, ...) {
      ifelse(pos > 0, "", "Not positive")
    },
    negative = function(neg, ...) {
      ifelse(neg < 0, "", "Not negative")
    },
    zero = function(z, ...) {
      ifelse(z == 0, "", "Not zero")
    },
    neg_or_zero = function(neg, z, ...) {
      ""
    }
  )

  expect_message(perform_checks(sample_rules, pos = NULL, neg = -1, z = 0),
                 regexp = "`positive`.+`pos`",
                 all = TRUE)
  expect_message(
    expect_message(
      perform_checks(sample_rules, pos = 1, neg = NULL, z = 0),
      "negative"),
    "neg_or_zero"
  )

  # two parameters missing
  expect_message(
    expect_message(
      expect_message(
        perform_checks(sample_rules, pos = 1, neg = NULL, z = NULL),
        "negative"
      ),
      "zero"
    ),
    "neg_or_zero"
  )
})

test_that("User can specify `all` for overrides", {
  sample_rules <- list(
    positive = function(pos, ...) {
      ifelse(pos > 0, "", "Not positive")
    },
    negative = function(neg, ...) {
      ifelse(neg < 0, "", "Not negative")
    },
    zero = function(z, ...) {
      ifelse(z == 0, "", "Not zero")
    }
  )

  expect_equal(
    process_overrides("all", sample_rules),
    c("positive", "negative", "zero")
  )

  expect_equal(
    process_overrides(c("all"), sample_rules),
    c("positive", "negative", "zero")
  )

  expect_equal(
    process_overrides(c("all", "positive"), sample_rules),
    c("positive", "negative", "zero")
  )

  expect_equal(
    process_overrides(c("positive", "all"), sample_rules),
    c("positive", "negative", "zero")
  )
})

test_that("Invalid overrides produce warnings", {
  sample_rules <- list(
    positive = function(pos, ...) {
      ifelse(pos > 0, "", "Not positive")
    },
    negative = function(neg, ...) {
      ifelse(neg < 0, "", "Not negative")
    },
    zero = function(z, ...) {
      ifelse(z == 0, "", "Not zero")
    }
  )

  expect_warning(process_overrides("invalid", sample_rules), "diagnostic")
})

test_that("Errors raised are wrapped with source of warning", {
  sample_rules <- list(
    positive = function(pos, ...) {
      ifelse(pos > 0, "", "Not positive")
    },
    negative = function(neg, ...) {
      ifelse(neg < 0, "", "Not negative")
    },
    zero = function(z, ...) {
      ifelse(z == 0, "", "Not zero")
    },
    always_error = function(...) {
      stop("This is an error")
      ""
    }
  )

  # The "always_error" diagnostic test should result in an error containing
  # the name of the diagnostic test
  expect_error(
    perform_checks(sample_rules, pos = +1, neg = -1, z = 0),
    "always_error"
  )

  # The behavior should be the same, even if some tests fail
  # In this case, the warnings should still be raised, at least
  # if they occur before the error
  expect_error(
    expect_warning(
      perform_checks(sample_rules, pos = +1, neg = +1, z = 0),
      "negative"),
    "always_error"
  )
})