context("cluster_edge_betweenness")
test_that("cluster_edge_betweenness works", {
library(igraph)
g <- make_graph("Zachary")
ebc <- cluster_edge_betweenness(g)
expect_that(max(ebc$modularity), equals(modularity(g, ebc$membership)))
expect_that(as.vector(membership(ebc)),
equals(c(1, 1, 2, 1, 3, 3, 3, 1, 4, 5,
3, 1, 1, 1, 4, 4, 3, 1, 4, 1,
4, 1, 4, 4, 2, 2, 4, 2, 2, 4,
4, 2, 4, 4)))
expect_that(length(ebc), equals(5))
expect_that(as.numeric(sizes(ebc)), equals(c(10, 6, 5, 12, 1)))
d <- as.dendrogram(ebc)
expect_that(print(d), prints_text("2 branches.*34 members.*height 33"))
expect_that(print(d[[1]]),
prints_text("2 branches.*15 members.*height 31"))
expect_that(print(d[[2]]),
prints_text("2 branches.*19 members.*height 32"))
m2 <- cut_at(ebc, no=3)
expect_that(modularity(g, m2),
equals(ebc$modularity[length(ebc$modularity)-2]))
})
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