// first argument is require('tape') or a 't' test runner
// second is the type of fixtures: 'all', 'geometry', 'feature', 'featurecollection'
// third is the function to run to turn input into output: the tested function.
// fourth is the directory where test output should be stored.
// fifth is whether to enable geojsonhint as a last step. set to false to disable.
// sixth is a postcondition that can be any arbitrary test
geojsonFixtures(test, 'all', centroid, __dirname + '/test', true, function(t, input, output) {
    t.ok(input);
});