if (fritools::get_run_r_tests()) {
    library(testthat)
    if (interactive()) {
        pkgload::load_all()
        library("testthat")
    } else {
        library("document")
    }
    glbt <- fritools::get_lines_between_tags
    ratio <- 0.3

    context("files")
    file_name  <- file.path(system.file("files",
                                        package = "document"),
                            "mini_mal.R")
    res <- document(file_name, check_package = TRUE, runit = TRUE)
    test_that("path", {
                  options(useFancyQuotes = FALSE)
                  current <- res[["txt_path"]]
                  reference  <- file.path(tempdir(), "mini_mal.txt")
                  expect_equal(current, reference)
                            }
    )
    test_that("existance", {
                  current <- res[["txt_path"]]
                  expect_true(file.exists(current))
    }
    )

    context("expected files")
    test_that("clean", {
                  file_name  <- file.path(system.file("files",
                                                      package = "document"),
                                          "simple.R")
                  expected_file <- file.path(system.file("expected_files",
                                                         package = "document"),
                                             "simple.html")

                  res <- document(file_name, clean = TRUE, runit = TRUE)
                  current <- readLines(res[["html_path"]])
                  reference  <- readLines(expected_file)
                  expect_true(sum(reference %in% current) / length(current)
                              >= ratio)
    }
    )
    test_that("simple", {
                  options(useFancyQuotes = FALSE)
                  file_name  <- file.path(system.file("files",
                                                      package = "document"),
                                          "simple.R")
                  res <- document(file_name, check_package = TRUE, runit = TRUE)
                  current <- checks(res[["check_result"]])
                  expect_true(! any(current["errors"]))
                  res <- document(file_name, check_package = TRUE, runit = TRUE,
                                  check_as_cran = FALSE)
                  current <- checks(res[["check_result"]])[["errors"]]
                  expect_true(!current)
    }
    )
    context("man")
    test_that("from R file", {
                  options(pager = switch(.Platform[["OS.type"]],
                                         "unix" = "cat", "console"))
                  path <- system.file("files", "simple.R",
                                      package = "document")
                  document::man(x = path, topic = "a_first_function")
                  cfile <- file.path(get_dpd(), "man", "a_first_function.Rd")
                  current <- utils::capture.output(tools::Rd2txt(cfile))
                  rfile <- system.file("expected_files",
                                       "sanitized_a_first_function.txt",
                                       package = "document")
                  reference  <- readLines(rfile)
                  expect_true(sum(reference %in% current) / length(current)
                              >= ratio)
    }
    )
    test_that("from R file missing topic", {
                  path <- system.file("files", "simple.R",
                                      package = "document")
                  error_message <-
                      paste0("Give either a path to an R documentation file ",
                             "or additionally give a topic.")
                  expect_error(document::man(x = path), error_message)
    }
    )

    test_that("from topic, missing package", {
                  options("document_package_directory" = NULL)
                  error_message <- paste("Give the path to a file as x",
                                         "and \"foo\" as topic.")
                  expect_error(document::man(x = "foo"), error_message)
    }
    )
    test_that("from Rd file", {
                  options(pager = switch(.Platform[["OS.type"]],
                                         "unix" = "cat", "console"))
                  path <- system.file("files", "simple.R",
                                      package = "document")
                  document::document(file_name = path, check_package = FALSE)
                  cfile <- file.path(get_dpd(), "man", "a_first_function.Rd")
                  document::man(x = cfile)
                  current <- utils::capture.output(tools::Rd2txt(cfile))
                  rfile <- system.file("expected_files",
                                       "sanitized_a_first_function.txt",
                                       package = "document")
                  reference  <- readLines(rfile)
                  expect_true(sum(reference %in% current) / length(current)
                              >= ratio)
    }
    )
    test_that("from topic", {
                  options(pager = switch(.Platform[["OS.type"]],
                                         "unix" = "cat", "console"))
                  path <- system.file("files", "simple.R",
                                      package = "document")
                  document::document(file_name = path, check_package = FALSE)
                  document::man(x = "a_first_function")
                  cfile <- file.path(get_dpd(), "man", "a_first_function.Rd")
                  current <- utils::capture.output(tools::Rd2txt(cfile))
                  rfile <- system.file("expected_files",
                                       "sanitized_a_first_function.txt",
                                       package = "document")
                  reference  <- readLines(rfile)
                  expect_true(sum(reference %in% current) / length(current)
                              >= ratio)
    }
    )


    context("utils")
    test_that("fake package", {
                  path <- system.file("files", "no_roxy.R",
                                      package = "document")
                  expect_warning(f <- document:::fake_package(file_name = path))
                  expect_true(file.exists(file.path(f, "DESCRIPTION")))
    }
    )
    test_that("add deps", {
                  path <- system.file("files", "minimal.R",
                                      package = "document")
                  f <- fake_package(file_name = path, working_directory = NULL,
                                    dependencies = "utils")
                  lines <- readLines(file.path(f, "DESCRIPTION"))
                  index <- grep("^Depends:", lines)
                  current <- lines[c(index, index + 1)]
                  reference <- c("Depends: ", "    utils")
                  expect_equal(current, reference)
    }
    )
}