test_that("delete_edges works", {
  g <- graph_from_literal(A:B:C - D:E:F, D - E - F)
  g2 <- delete_edges(g, E(g, P = c("D", "E")))
  expect_that(
    as.matrix(g2[]),
    is_equivalent_to(cbind(
      c(0, 0, 0, 1, 1, 1), c(0, 0, 0, 1, 1, 1),
      c(0, 0, 0, 1, 1, 1), c(1, 1, 1, 0, 0, 0),
      c(1, 1, 1, 0, 0, 1), c(1, 1, 1, 0, 1, 0)
    ))
  )
})