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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