Nothing
test_that("track.properties.3d works", {
properties <- track.properties.3d(niclas)
expect_is(properties, "data.frame")
expect_equal(any(apply(properties, class, MARGIN = 2) != "numeric"), FALSE)
expect_equal(colnames(properties), c("x", "y", "z", "a", "g", "t", "l", "d"))
expect_equal(nrow(properties), nrow(niclas))
})
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