test_that("without_attr", {
  set.seed(42)
  g <- sample_gnp(10, 2 / 10) %>%
    delete_graph_attr("name") %>%
    delete_graph_attr("type") %>%
    delete_graph_attr("loops") %>%
    delete_graph_attr("p")

  set.seed(42)
  g2 <- sample_(gnp(10, 2 / 10), without_attr())

  expect_true(identical_graphs(g, g2))
  expect_equal(graph_attr_names(g2), character())
  expect_equal(vertex_attr_names(g2), character())
  expect_equal(edge_attr_names(g2), character())
})


test_that("without_loops", {
  g <- make_graph(~ A - A:B:C, B - A:B:C, simplify = FALSE) %>%
    simplify(remove.multiple = FALSE)

  g2 <- make_(
    from_literal(A - A:B:C, B - A:B:C, simplify = FALSE),
    without_loops()
  )

  expect_true(identical_graphs(g, g2))
  expect_true(all(!which_loop(g2)))
})


test_that("without_multiple", {
  g <- make_graph(~ A - A:B:C, B - A:B:C, simplify = FALSE) %>%
    simplify(remove.loops = FALSE)

  g2 <- make_(
    from_literal(A - A:B:C, B - A:B:C, simplify = FALSE),
    without_multiples()
  )

  expect_true(identical_graphs(g, g2))
  expect_true(all(!which_multiple(g2)))
})


test_that("simplified", {
  g <- make_graph(~ A - A:B:C, B - A:B:C)

  g2 <- make_(
    from_literal(A - A:B:C, B - A:B:C, simplify = FALSE),
    simplified()
  )

  expect_true(identical_graphs(g, g2))
  expect_true(all(!which_multiple(g2)))
  expect_true(all(!which_loop(g2)))
})


test_that("with_vertex_", {
  g <- make_graph(~ A - A:B:C, B - A:B:C) %>%
    set_vertex_attr("color", value = "red") %>%
    set_vertex_attr("foo", value = paste0("xx", 1:3))

  g2 <- make_(
    from_literal(A - A:B:C, B - A:B:C),
    with_vertex_(
      color = "red",
      foo = paste0("xx", 1:3)
    )
  )

  expect_true(identical_graphs(g, g2))
  expect_equal(V(g2)$color, rep("red", gorder(g2)))
  expect_equal(V(g2)$foo, paste0("xx", 1:3))
})


test_that("with_edge_", {
  g <- make_graph(~ A - A:B:C, B - A:B:C) %>%
    set_edge_attr("color", value = "red") %>%
    set_edge_attr("foo", value = seq_len(3))

  g2 <- make_(
    from_literal(A - A:B:C, B - A:B:C),
    with_edge_(
      color = "red",
      foo = seq_len(3)
    )
  )

  expect_true(identical_graphs(g, g2))
  expect_equal(E(g)$color, E(g2)$color)
  expect_equal(E(g)$foo, E(g2)$foo)
})


test_that("with_graph_", {
  g <- make_graph(~ A - A:B:C, B - A:B:C) %>%
    set_graph_attr("color", value = "red") %>%
    set_graph_attr("foo", value = 1:5)

  g2 <- make_(
    from_literal(A - A:B:C, B - A:B:C),
    with_graph_(
      color = "red",
      foo = 1:5
    )
  )

  expect_true(identical_graphs(g, g2))
  expect_equal(g$color, g2$color)
  expect_equal(g$foo, g2$foo)
})


test_that("adding and removing attributes", {
  g <- make_empty_graph()
  g2 <- make_empty_graph()

  g$foo <- "bar"
  g <- delete_graph_attr(g, "foo")
  E(g)$foo <- "bar"
  g <- delete_edge_attr(g, "foo")
  V(g)$foo <- "bar"
  g <- delete_vertex_attr(g, "foo")

  expect_true(identical_graphs(g, g2))
})