test_that("longitree returns correct class with gamma", {
  data(ltreedata)

  result <- longitree(y ~ ., time = "time", random = "subject",
                         weight = 0.2, data = ltreedata, gamma = 1.5)

  expect_s3_class(result, "longitree")
  expect_true(!is.null(result$rsplitmat))
  expect_true(!is.null(result$rpredict))
  expect_true(!is.null(result$nmat))
})

test_that("longitree errors when no method is specified", {
  expect_error(
    longitree(y ~ x, time = "t", random = "id",
                 data = data.frame(y = 1, x = 1, t = 1, id = 1)),
    "alpha, gamma, or cv"
  )
})

test_that("longitree errors when multiple methods are specified", {
  expect_error(
    longitree(y ~ x, time = "t", random = "id",
                 data = data.frame(y = 1, x = 1, t = 1, id = 1),
                 alpha = 0.05, gamma = 1.5),
    "Only one of"
  )
})

test_that("summary.longitree produces output", {
  data(ltreedata)

  result <- longitree(y ~ ., time = "time", random = "subject",
                         weight = 0.2, data = ltreedata, gamma = 1.5)

  expect_output(summary(result))
  expect_output(print(result))
})

test_that("longitree works with alpha method", {
  data(ltreedata)

  result <- longitree(y ~ ., time = "time", random = "subject",
                         weight = 0.2, data = ltreedata, alpha = 0.05)

  expect_s3_class(result, "longitree")
})