nasty <- structure(list(edge = structure(
  c(9, 12, 10, 13, 11, 10, 11, 13, 10, 13, 12, 9,
    5, 10,  1,  2,  3, 13,  9,  4, 11,  7,  8, 6),
  .Dim = c(12, 2)),
  Nnode = 5L,
  tip.label = letters[1:8]),
  class = "phylo") # Danger: Do not plot!

test_that("AddTipEverywhere() correct", {
  backbone <- PectinateTree(5)
  
  expect_equal(7L, length(AddTipEverywhere(backbone, includeRoot = FALSE)))
  expect_equal(7L, length(AddTipEverywhere(UnrootTree(backbone),
                                           includeRoot = FALSE)))
  expect_equal(9L, length(AddTipEverywhere(backbone, includeRoot = TRUE)))
  expect_equal(5L, length(AddTipEverywhere(CollapseNode(backbone, 7:9))))
  
})

test_that("AddTip() at root", {
  expect_true(all.equal(
    AddTip(DropTip(PectinateTree(8), 1), where = 0, label = "t1"),
    PectinateTree(8)))
  AddTip(nasty, 1L)
  AddTip(nasty, 12L)
  expect_true(TRUE) # no crashes!
})

test_that("AddTip() with tip name", {
  bal8 <- BalancedTree(8)
  expect_error(AddTip(bal8, "invalid tip"))
  expect_equal(AddTip(bal8, 1L), AddTip(bal8, "t1"))
  expect_equal(AddTip(nasty, 1L), AddTip(nasty, "a"))
})

test_that("AddTip() with edge lengths", {
  pec8 <- PectinateTree(8)
  pec8$edge.length <- rep(1L, 14L)
  
  add1 <- AddTip(pec8, 0, "Root")
  expect_equal(dim(add1$edge)[1], length(add1[["edge.length"]]))
  
  # case = 1 -> y is bound on the root of x
  expect_equal(c(0.6, rep(1, 14), 2),
               AddTip(pec8, 0, edgeLength = 2, lengthBelow = 0.6)$edge.length)
  # case = 2 -> y is bound on a tip of x
  expect_equal(c(rep(1, 2), 0.3, 0.7, 2, rep(1, 11)),
               AddTip(pec8, 2, edgeLength = 2, lengthBelow = 0.7)$edge.length)
  expect_equal(c(rep(1, 2), 0.5, 0.5, 2, rep(1, 11)),
               AddTip(pec8, 2, edgeLength = 2, lengthBelow = NULL)$edge.length)
  # case = 3 -> y is bound on a node of x
  expect_equal(c(rep(1, 11), 0.3, 2, 0.7, 1, 1),
               AddTip(pec8, 15, edgeLength = 2, lengthBelow = 0.7)$edge.length)
  expect_equal(c(rep(1, 11), 0.5, 0, 0.5, 1, 1),
               AddTip(pec8, 15)$edge.length)
  expect_equal(c(rep(1, 11), 0, 2, 1, 1, 1),
               AddTip(pec8, 15, edgeLength = 2, lengthBelow = 1)$edge.length)
  expect_equal(c(rep(1, 11), -0.6, 2, 1.6, 1, 1),
               AddTip(pec8, 15, edgeLength = 2, lengthBelow = 1.6)$edge.length)
})

test_that("AddTipEverywhere() handles nasty tree", {
  added <- AddTipEverywhere(nasty)
  lapply(added, function(tr) expect_true(all(tr$edge > 0)))
  expect_true(all.equal(lapply(added, Preorder),
                        AddTipEverywhere(Preorder(nasty))))
})

test_that("AddTipEverywhere() with tiny trees", {
  added <- AddTipEverywhere(StarTree(2))
  lapply(added, function(tr) expect_true(all(tr$edge > 0)))
  expect_equal(2, length(added))
  expect_equal(3, length(AddTipEverywhere(StarTree(2), include = TRUE)))
  
  expect_equal(list(PectinateTree(c("t1", "New tip"))),
               AddTipEverywhere(StarTree(1)))
  expect_equal(list(SingleTaxonTree("New tip")),
               AddTipEverywhere(structure(list(tip.label = character(0)),
                                          class = "phylo")))
})