context("decompose")
test_that("decompose works", {
library(igraph)
g <- sample_gnp(1000, 1/1500)
G <- decompose(g)
clu <- components(g)
Gsizes <- sapply(G, vcount)
expect_that(sort(clu$csize), equals(sort(Gsizes)))
})
test_that("decompose works for many components", {
library(igraph)
g <- make_empty_graph(50001)
tmp <- decompose(g)
expect_that(1, equals(1))
})
test_that("decompose works for many components and attributes", {
library(igraph)
g <- make_empty_graph(50001)
V(g)$name <- 1:vcount(g)
tmp <- decompose(g)
expect_that(1, equals(1))
})
test_that("decompose keeps attributes", {
library(igraph)
g <- make_ring(10) + make_ring(5)
V(g)$name <- letters[1:(10+5)]
E(g)$name <- apply(as_edgelist(g), 1, paste, collapse="-")
d <- decompose(g)
d <- d[order(sapply(d, vcount))]
expect_that(length(d), equals(2))
expect_that(sapply(d, vcount), equals(c(5,10)))
expect_that(V(d[[1]])$name, equals(letters[1:5+10]))
expect_that(V(d[[2]])$name, equals(letters[1:10]))
e1 <- apply(as_edgelist(d[[1]]), 1, paste, collapse="-")
e2 <- apply(as_edgelist(d[[2]]), 1, paste, collapse="-")
expect_that(E(d[[1]])$name, equals(e1))
expect_that(E(d[[2]])$name, equals(e2))
})
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