context("greedy vertex coloring") test_that("greedy_vertex_coloring works", { g <- make_star(10, mode="undirected") expect_that( greedy_vertex_coloring(g), equals(c(1, rep(2, vcount(g)-1))) ) expect_that( greedy_vertex_coloring(g, heuristic="colored_neighbors"), equals(c(1, rep(2, vcount(g)-1))) ) }) test_that("greedy_vertex_coloring works on named graphs", { g <- make_star(10, mode="undirected") V(g)$name <- LETTERS[1:vcount(g)] vc <- greedy_vertex_coloring(g) expect_that(as.vector(vc), equals(c(1, rep(2, vcount(g)-1)))) expect_that(names(vc), equals(V(g)$name)) }) context("simplify_and_colorize") test_that("simplify_and_colorize works", { g <- make_graph(~ A-B-C-D-E, B-C, B-C, B-C, D-E-E, simplify=FALSE) result <- simplify_and_colorize(g) expect_true(is_simple(result)) expect_that(vcount(result), equals(vcount(g))) expect_that(get.edgelist(result), equals(matrix(c(1:4, 2:5), ncol=2))) expect_that(V(result)$color, equals(c(0, 0, 0, 0, 1))) expect_that(E(result)$color, equals(c(1, 4, 1, 2))) })
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