context("Start() metadata_dims check")

test_that("1. One data set", {
  repos <- "/esarchive/exp/ecmwf/system5_m1/monthly_mean/$var$_f6h/$var$_$sdate$.nc"
  data <- Start(dat = list(list(name = 'system5_m1', path = repos)),
                var = 'tas',
                sdate = '20170101',
                ensemble = indices(1),
                time = indices(1),
                lat = indices(1:10),
                lon = indices(1:10),
                synonims = list(lat = c('lat', 'latitude'),
                                lon = c('lon', 'longitude')),
                return_vars = list(time = 'sdate',
                                   longitude = 'dat',
                                   latitude = 'dat'),
                metadata_dims = 'dat',  # it can be omitted since it is automatically specified as 'dat'
                retrieve = T
               )

  expect_equal(
  length(attr(data, 'Variables')),
  2
  )
  expect_equal(
  names(attr(data, 'Variables')),
  c("common", "system5_m1")
  )
  expect_equal(
  names(attr(data, 'Variables')$common),
  c('time', 'tas')
  )
  expect_equal(
  names(attr(data, 'Variables')$system5_m1),
  c("longitude", "latitude")
  )
  expect_equal(
  length(attr(data, 'Variables')$common$tas),
  12
  )

}


test_that("2. Two data sets", {
  repos <- "/esarchive/exp/ecmwf/system5_m1/monthly_mean/$var$_f6h/$var$_$sdate$.nc"
  repos2 <- "/esarchive/exp/ecmwf/system4_m1/monthly_mean/$var$_f6h/$var$_$sdate$.nc"

  data <- Start(dat = list(list(name = 'system4_m1', path = repos2),
                           list(name = 'system5_m1', path = repos)),
                var = 'tas',
                sdate = '20170101',
                ensemble = indices(1),
                time = indices(1),
                lat = indices(1:10),
                lon = indices(1:10),
                synonims = list(lat = c('lat', 'latitude'),
                                lon = c('lon', 'longitude')),
                return_vars = list(time = 'sdate',
                                   longitude = 'dat',
                                   latitude = 'dat'),
                metadata_dims = 'dat',  # it can be omitted since it is automatically specified as 'dat'
                retrieve = T
               )

  expect_equal(
  length(attr(data, 'Variables')),
  3
  )
  expect_equal(
  names(attr(data, 'Variables')),
  c("common", "system4_m1", "system5_m1")
  )
  expect_equal(
  names(attr(data, 'Variables')$common),
  'time'
  )
  expect_equal(
  names(attr(data, 'Variables')$system4_m1),
  c("longitude", "latitude", "tas")
  )
  expect_equal(
  names(attr(data, 'Variables')$system5_m1),
  c("longitude", "latitude", "tas")
  )
  expect_equal(
  length(attr(data, 'Variables')$system5_m1$tas),
  12
  )
  expect_equal(
  length(attr(data, 'Variables')$system4_m1$tas),
  11
  )

}

test_that("3. Specify metadata_dims with another file dimension", {


}