Nothing
gtfs_path <- system.file("extdata/ggl_gtfs.zip", package = "gtfsio")
gtfs <- import_gtfs(gtfs_path)
# 'class' attribute should not be summarised alongside the object itself
out <- capture.output(summary(gtfs))
has_class <- grepl("class", out)
expect_false(any(has_class))
# attributes should not print
attr(gtfs, "tmp") <- "temp_attribute"
out <- capture.output(summary(gtfs))
has_attr <- grepl("temp", out)
expect_false(any(has_attr))
# summary.gtfs() is different to print.default()
out_gtfs <- capture.output(summary(gtfs))
out_default <- capture.output(summary(unclass(gtfs)))
expect_true(!identical(out_gtfs, out_default))
# default summary is more verbose:
expect_true(length(out_gtfs) < length(out_default))
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