context("Triangles") test_that("Listing triangles works", { triangles <- function(...) as.vector(igraph::triangles(...)) g1 <- make_empty_graph(directed=TRUE) g2 <- make_empty_graph(directed=FALSE) expect_that(triangles(g1), equals(numeric())) expect_that(triangles(g2), equals(numeric())) g3 <- make_empty_graph(n=1, directed=TRUE) g4 <- make_empty_graph(n=1, directed=FALSE) expect_that(triangles(g3), equals(numeric())) expect_that(triangles(g4), equals(numeric())) g5 <- make_empty_graph(n=100, directed=TRUE) g6 <- make_empty_graph(n=100, directed=FALSE) expect_that(triangles(g5), equals(numeric())) expect_that(triangles(g6), equals(numeric())) g7 <- make_ring(3, directed=FALSE) g8 <- make_ring(3, directed=TRUE) g9 <- graph_from_literal(A-+B:C, B-+C) expect_that(sort(triangles(g7)), equals(1:3)) expect_that(sort(triangles(g8)), equals(1:3)) expect_that(sort(triangles(g9)), equals(1:3)) g10 <- make_full_graph(5, directed=FALSE) g11 <- make_full_graph(5, directed=TRUE) r10 <- c(1L, 2L, 5L, 1L, 2L, 3L, 1L, 2L, 4L, 1L, 3L, 5L, 1L, 3L, 4L, 1L, 4L, 5L, 2L, 3L, 5L, 2L, 3L, 4L, 2L, 4L, 5L, 3L, 4L, 5L) r11 <- r10 expect_that(triangles(g10), equals(r10)) expect_that(triangles(g11), equals(r11)) })
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