tests/testthat/test-print.R

In igraph/rigraph: Network Analysis and Visualization

test_that("print.igraph works", {
  local_igraph_options(print.full = TRUE)
  options(width = 76)

  g <- make_ring(5)
  expect_output(summary(g), "attr:.* name[ ]*[(]g/c[)]")
  expect_output(print(g), "attr:.* name[ ]*[(]g/c[)]")
  expect_output(print(g), "1--2")

  V(g)$name <- letters[1:vcount(g)]
  expect_output(summary(g), "name[ ]*[(]v/c[)]")
  expect_output(print(g), "a--b")

  withr::local_seed(42)
  E(g)$weight <- sample(ecount(g))
  expect_output(summary(g), "weight[\n |]*[(]e/n[)]")

  g$name <- "A ring"
  expect_output(summary(g), "A ring")
  expect_output(print(g, v = T), "vertex attributes")
  expect_output(print(g, e = T), "edges [(]vertex names[)] and")

  withr::local_seed(42)
  g2 <- sample_gnp(13, p = 0.6, directed = TRUE)
  expect_output(print(g2), "1 ->")

  g3 <- sample_gnp(20, p = 0.8)
  expect_output(print(g3), "1 --")

  g4 <- make_star(100)
  expect_output(print(g4), "2->1")

  g5 <- make_star(100, mode = "out")
  expect_output(print(g5), "1->")

  g6 <- sample_pa(100, m = 6, directed = FALSE)
  expect_output(print(g6), "     ")

  kite <- make_empty_graph(directed = FALSE) + LETTERS[1:10]
  kite <- kite + edges(
    "A", "B", "A", "C", "A", "D", "A", "F",
    "B", "D", "B", "E", "B", "G", "C", "D", "C", "F",
    "D", "E", "D", "F", "D", "G", "E", "G",
    "F", "G", "F", "H", "G", "H", "H", "I", "I", "J"
  )
  expect_output(print(kite), "A -- ")
})

test_that("print.igraph.es uses vertex names", {
  local_igraph_options(print.id = FALSE)

  g <- make_directed_graph(c("A", "B"))
  expect_snapshot({
    E(g)
  })
})