/usr/share/doc/r-cran-igraph/tests/testthat/test_girth.R is in r-cran-igraph 1.1.2-2ubuntu3.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | 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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