context("freq.R")

test_that("frequency table works", {
  expect_equal(nrow(freq(c(1, 1, 2, 2, 3, 3, 4, 4, 5, 5), as.data.frame = TRUE)), 5)
  expect_equal(nrow(frequency_tbl(c(1, 1, 2, 2, 3, 3, 4, 4, 5, 5), as.data.frame = TRUE)), 5)

  # date column of septic_patients should contain 1662 unique dates
  expect_equal(nrow(freq(septic_patients$date, as.data.frame = TRUE)), 1662)
  expect_equal(nrow(freq(septic_patients$date, as.data.frame = TRUE)),
               length(unique(septic_patients$date)))

  # int
  expect_output(freq(septic_patients$age))
  # date
  expect_output(freq(septic_patients$date))
  # factor
  expect_output(freq(septic_patients$hospital_id))

  library(dplyr)
  expect_output(septic_patients %>% select(1:2) %>% freq())
  expect_output(septic_patients %>% select(1:3) %>% freq())
  expect_output(septic_patients %>% select(1:4) %>% freq())
  expect_output(septic_patients %>% select(1:5) %>% freq())
  expect_output(septic_patients %>% select(1:6) %>% freq())
  expect_output(septic_patients %>% select(1:7) %>% freq())
  expect_output(septic_patients %>% select(1:8) %>% freq())
  expect_output(septic_patients %>% select(1:9) %>% freq())

  # top 5
  expect_equal(
    septic_patients %>%
      select(bactid) %>%
      freq(as.data.frame = TRUE) %>%
      top_freq(5) %>%
      length(),
    5)
  # there're more than 5 lowest values
  expect_gt(
    septic_patients %>%
      select(bactid) %>%
      freq(as.data.frame = TRUE) %>%
      top_freq(-5) %>%
      length(),
    5)
  # n has length > 1
  expect_error(
    septic_patients %>%
      select(bactid) %>%
      freq(as.data.frame = TRUE) %>%
      top_freq(n = c(1, 2))
  )
  # input must be freq tbl
  expect_error(septic_patients %>% top_freq(1))

})