context("add_edges")
test_that("add_edges keeps edge id order", {
library(igraph)
g <- make_empty_graph(10)
edges <- c(1,2, 2,3, 3,4, 1,6, 1,7, 9,10)
g2 <- add_edges(g, edges)
ec <- ecount(g2)
ec2 <- length(edges)/2
expect_equal(ec, ec2)
expect_equal(get.edge.ids(g2, edges), seq_len(length(edges)/2))
})
test_that("add_edges adds attributes", {
library(igraph)
g <- make_empty_graph(10)
g3 <- add_edges(g, (edges <- c(1,5, 2,6, 3,10, 4,5)),
attr=list(weight=(weights <- c(1,2,1,-1))) )
expect_that(ecount(g3), equals(length(edges)/2))
expect_that(get.edge.ids(g3, edges), equals(seq_len(length(edges)/2)))
expect_that(E(g3)$weight, equals(weights))
})
test_that("add_edges unknown attributes to NA", {
library(igraph)
g <- make_empty_graph(10)
g2 <- add_edges(g, (edges <- c(1,2, 2,3, 3,4, 1,6, 1,7, 9,10)) )
g4 <- add_edges(g2, c(1,4, 4,6, 7,1), attr=list(weight=c(-1,1,-2.5)))
expect_true(all(is.na(E(g4)$weight[seq_len(length(edges)/2)])))
})
test_that("add_edges appends attributes properly", {
library(igraph)
g <- make_empty_graph(10)
g3 <- add_edges(g, (edges1 <- c(1,5, 2,6, 3,10, 4,5)),
attr=list(weight=(weights1 <- c(1,2,1,-1))) )
g5 <- add_edges(g3, (edges2 <- c(10,9, 10,10, 1,1)),
attr=list(weight=(weights2 <- c(100,100,100))) )
expect_that(E(g5)$weight, equals(c(weights1, weights2)))
})
test_that("add_edges signals error for zero vertex ids", {
library(igraph)
g <- make_full_graph(5) %du% make_full_graph(5) %du% make_full_graph(5)
expect_that(add_edges(g, c(0,5, 0,10, 5,10)),
throws_error("Invalid vertex id"))
})
Generated by dwww version 1.15 on Sat May 18 14:13:28 CEST 2024.