tests/testthat/test-variance.R

In ropensci/lawn: Client for 'Turfjs' for 'Geospatial' Analysis

context("lawn_variance")

poly <- lawn_data$polygons_average
pt <- lawn_data$points_average

a <- lawn_variance(poly, pt, 'population', 'variance')

test_that("lawn_variance returns correct classes", {
  expect_is(a, "featurecollection")
  expect_is(a$type, "character")
  expect_is(a$features, "data.frame")
  expect_is(a$features$geometry$type, "character")
  expect_is(a$features$geometry$coordinates[[1]], "array")
  expect_equal(a$features$geometry$type[1], "Polygon")
})

test_that("cellWidth parameter works as expected", {
  expect_equal(
    length(na.omit(lawn_variance(poly, pt, 'population2')$features$properties$variance)),
    0
  )
  expect_named(lawn_variance(poly, pt, 'population', 'bears')$features$properties,
               c('values', 'bears'))
})

test_that("lawn_variance fails correctly", {
  # missing arguments
  expect_error(lawn_variance(), "argument \"in_field\" is missing, with no default")
  # wrong in_field param leads to no ouput for max
  expect_equal(
    length(na.omit(lawn_variance(poly, pt, 'population2')$features$properties$variance)),
    0
  )
  # can't pass in a character string to cellWidth
  expect_error(lawn_variance(poly, "{}", 'population', 'max'))
  # can't pass in a character string to cellWidth
  expect_error(lawn_variance(poly, "{}", 'population', 'max', lint = TRUE),
               'Line 1 - "type" member required')
})