test_that("signed islands islands.n error works", {
  expect_error(sample_islands_signed(1,10,1,1))
})

test_that("signed islands islands.n error works", {
  expect_error(sample_islands_signed(3,1,1,1))
})

test_that("signed islands islands.pin error works", {
  expect_error(sample_islands_signed(3,3,2,1))
})

test_that("signed islands n.inter error works", {
  expect_error(sample_islands_signed(3,3,1,0))
})

test_that("signed islands works", {
  g <- sample_islands_signed(2,10,1,1)
  expect_lte(igraph::ecount(g),choose(10,2)*2+2)
})

test_that("circular signed works", {
  g <- graph_circular_signed(10,pos=1,neg=0)
  expect_equal(igraph::graph.density(g),1)
})

test_that("sample signed gnp works", {
  g <- sample_gnp_signed(10,1,1)
  expect_equal(igraph::graph.density(g),1)
})

test_that("sample signed b1partite works", {
  g <- sample_bipartite_signed(10,10,1,1)
  expect_equal(igraph::ecount(g),100)
})