test_that("ms_innerlines works with all classes", {
  out_json <- ms_innerlines(innerlines_poly)
  expect_s3_class(out_json, "geojson")
  expect_snapshot_value(out_json, style = "json2")
  expect_s3_class(ms_innerlines(unclass(innerlines_poly)), "geojson")

  expected_sp <- as(GeoJSON_to_sp(out_json), "SpatialLines")

  expect_equivalent(ms_innerlines(innerlines_poly_spdf), expected_sp)
  expect_equivalent(ms_innerlines(innerlines_poly_sp), expected_sp)

  expected_sf <- read_sf(unclass(out_json))
  expect_equivalent(ms_innerlines(innerlines_poly_sf), expected_sf)
  expect_equivalent(
    ms_innerlines(innerlines_poly_sfc),
    st_geometry(expected_sf)
  )
})

test_that("ms_innerlines errors correctly", {
  expect_error(ms_innerlines('{foo: "bar"}'), "Input is not valid geojson")
  expect_error(
    ms_innerlines(innerlines_poly, force_FC = "true"),
    "force_FC must be TRUE or FALSE"
  )
  # Don't test this as the V8 error throws a warning
  expect_warning(
    ms_innerlines(ms_lines(innerlines_poly)),
    "The command returned an empty response"
  )
})

test_that("ms_innerlines works with sys = TRUE", {
  skip_if_not(has_sys_mapshaper())
  expect_s3_class(ms_innerlines(innerlines_poly, sys = TRUE), "geojson")
  expect_snapshot_value(
    ms_innerlines(innerlines_poly, sys = TRUE),
    style = "json2"
  )
  expect_snapshot_value(
    ms_innerlines(innerlines_poly, sys = TRUE, force_FC = FALSE),
    style = "json2"
  )

  expect_s4_class(
    ms_innerlines(innerlines_poly_spdf, sys = TRUE),
    "SpatialLines"
  )
  expect_s3_class(ms_innerlines(innerlines_poly_sf, sys = TRUE), "sf")
})