Nothing
test_that("backbone layout works", {
xy <- layout_as_backbone(igraph::graph.full(10))
expect_is(xy$xy, "matrix")
expect_is(xy$backbone, "numeric")
expect_error(layout_as_backbone(5))
expect_error(layout_as_backbone(igraph::graph.empty(5)))
expect_error(layout_as_backbone(igraph::graph_from_adjacency_matrix(matrix(c(0, 2, 2, 0), 2, 2), weighted = NULL, mode = "undirected")))
expect_error(layout_as_backbone(igraph::graph.full(5, directed = TRUE)))
expect_warning(layout_as_backbone(igraph::graph.full(5) + igraph::graph.full(5)))
})
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