test_that('files made correctly',{
expect_equal(make_filename(2013),'accident_2013.csv.bz2')
expect_equal(make_filename(2014),'accident_2014.csv.bz2')
})
test_that('wrong years identified',{
expect_error(fars_read(2019))
expect_error(fars_read(1888))
})
test_that('filename is string',{
expect_type(make_filename(2013), 'character')
})
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