context("add_vertices")
test_that("add_vertices works", {
library(igraph)
g <- graph_from_literal(A-B-C-D-E)
g2 <- add_vertices(g, (nv <- 4))
expect_that(vcount(g2), equals(vcount(g) + nv))
expect_that(ecount(g2), equals(ecount(g)))
expect_that(as_edgelist(g2), equals(as_edgelist(g)))
})
test_that("add_vertices handles attributes properly", {
library(igraph)
g <- graph_from_literal(A-B-C-D-E)
g3 <- add_vertices(g, (nv <- 3),
attr=list(name=(names <- c("F","G","H")),
weight=weights <- 1:3))
expect_that(V(g3)$name, equals(c(V(g)$name, names)))
expect_that(V(g3)$weight, equals(c(rep(NA, vcount(g)), weights)))
})
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