context("girth")
test_that("girth works", {
library(igraph)
## No circle in a tree
g <- make_tree(1000, 3)
gi <- girth(g)
expect_that(gi$girth, equals(0))
expect_that(as.vector(gi$circle), equals(numeric()))
## The worst case running time is for a ring
g <- make_ring(100)
gi <- girth(g)
expect_that(gi$girth, equals(100))
expect_that(sort(diff(as.vector(gi$circle))), equals(c(-99, rep(1, 98))))
})
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