Error: 'df_country_demographics' is not an exported object from 'namespace:choroplethr'

"continuous data returns continous scale with num colors = 0 or 1"
"continuous data returns discrete scale with num colors > 1"
"categorical data returns discrete scale and warns that num_colors ignored"

test_that("default parameters returns ggplot", {
test_that("different projections return ggplot", {
expect_s3_class(country_choropleth(df = df_world, geoid.name = 'region', value.name = 'population', projection = 'albers'), 'ggplot')
expect_s3_class(country_choropleth(df = df_world, geoid.name = 'region', value.name = 'population', projection = 'mercator'), 'ggplot')
expect_s3_class(country_choropleth(df = df_world, geoid.name = 'region', value.name = 'population', projection = 'robinson'), 'ggplot')
expect_s3_class(country_choropleth(df = df_world, geoid.name = 'region', value.name = 'population',

`expect_s3_class(...)` did not produce any warnings.

test_that("continuous scale returns ggplot", {
test_that("west coast zoom returns ggplot", {
expect_warning(expect_s3_class(county_choropleth(df_pop_county, state_zoom=c("california", "oregon", "washington")), "ggplot"))
test_that("nyc county zoom returns ggplot", {
expect_warning(expect_s3_class(county_choropleth(df_pop_county, num_colors=1, county_zoom=nyc_county_fips, add_state_outline = FALSE), 'ggplot'))

Error in `county_choropleth(df_pop_county, num_colors = 1, county_zoom = nyc_county_fips, 
    add_state_outline = FALSE)`: unused argument (add_state_outline = FALSE)