Nothing
test_that("components works", {
set.seed(42)
gc <- function(graph) {
cl <- components(graph)
induced_subgraph(graph, which(cl$membership == which.max(cl$csize)))
}
rg <- function(n) {
gc(sample_gnp(n, 1 / n))
}
G <- lapply(1:30, function(x) rg(sample(100, 1)))
Gsize <- sapply(G, vcount)
allg <- disjoint_union(G)
clu <- components(allg)
expect_that(as.numeric(table(clu$membership)), equals(clu$csize))
expect_that(sort(clu$csize), equals(sort(Gsize)))
expect_that(clu$no, equals(length(G)))
})
test_that("components names results", {
g <- make_ring(10) + make_full_graph(5)
V(g)$name <- letters[1:15]
clu <- components(g)
expect_that(names(clu$membership), equals(letters[1:15]))
})
test_that("groups works", {
g <- make_ring(10) + make_full_graph(5)
gr <- groups(components(g))
expect_that(gr, equals(structure(list(`1` = 1:10, `2` = 11:15),
.Dim = 2L,
.Dimnames = list(c("1", "2"))
)))
V(g)$name <- letters[1:15]
gr <- groups(components(g))
expect_that(gr, equals(structure(
list(
`1` = letters[1:10],
`2` = letters[11:15]
),
.Dim = 2L,
.Dimnames = list(c("1", "2"))
)))
})
test_that("is_connected works", {
g <- make_ring(10)
expect_that(g, is_connected)
g <- make_ring(10) + make_full_graph(5)
expect_false(is_connected(g))
})
test_that("is_connected returns FALSE for the null graph", {
g <- make_empty_graph(0)
expect_false(is_connected(g))
})
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