n_participants <- 8
n_rows_per_participant <- 10

data <- data.frame(
  participant = rep(1:n_participants, each = n_rows_per_participant),
  valid = rep(c(TRUE, FALSE), (n_participants * n_rows_per_participant)/2),
  dates = rep(seq(as.Date("2023-01-01"),
                  as.Date("2023-01-10"),
                  by = "day"), n_participants)
)

test_that('no period end or start', {

  expect_message(
    result <- response_rate(
      data = data,
      valid_col = valid,
      participant_col = participant,
      time_col = dates
    ),
    "Calculating response rates for the entire duration of the study."
  )

  # is it a df?
  expect_true(is.data.frame(result))

  # not necessarily always like this but should be in this case
  expect_true(nrow(result) == n_participants)

  expect_true(all(result$response_rate == rep(0.5, n_participants)))
})

test_that('period_end and start but no time variable', {

  # we just expect an error
  expect_error(
    response_rate(
      data = data,
      valid_col = valid,
      participant_col = participant,
      period_start = '2023-01-01',
      period_end = '2023-01-05'
    )
  )
})

test_that('only period_end given', {

  expect_message(result <- response_rate(data = data,
                                         valid_col = valid,
                                         participant_col = participant,
                                         time_col = dates,
                                         period_end = '2023-01-06')
                 , "Calculating response rates up to date: 2023-01-06")

  # is it a df?
  expect_true(is.data.frame(result))

  # 1 row per participant
  expect_true(nrow(result) == n_participants)

  expect_true(all(result$response_rate == rep(0.5, n_participants)))
})

test_that('only period_start given', {

  expect_message(result <- response_rate(data = data,
                                         valid_col = valid,
                                         participant_col = participant,
                                         time_col = dates,
                                         period_start = '2023-01-05')
                 , "Calculating response rates starting from date: 2023-01-05")

  # is it a df?
  expect_true(is.data.frame(result))

  # 1 row per participant
  expect_true(nrow(result) == n_participants)

  expect_true(all(result$response_rate == rep(0.5, n_participants)))
})

test_that('period_start and end given', {

  expect_message(result <- response_rate(data = data,
                                         valid_col = valid,
                                         participant_col = participant,
                                         time_col = dates,
                                         period_start = '2023-01-02',
                                         period_end = '2023-01-07')
                 , "Calculating response rates between date: 2023-01-02 and 2023-01-07")

  # is it a df?
  expect_true(is.data.frame(result))

  # 1 row per participant
  expect_true(nrow(result) == n_participants)

  expect_true(all(result$response_rate == rep(0.5, n_participants)))
})