revdep/checks.noindex/insight/new/insight.Rcheck/tests/testthat/test-Gam2.R

In gbm-developers/gbm: Generalized Boosted Regression Models

if (require("testthat") &&
  require("insight") &&
  require("gam")) {
  context("insight, gam")

  data(kyphosis)
  m1 <- gam::gam(
    Kyphosis ~ s(Age, 4) + Number,
    family = binomial,
    data = kyphosis,
    trace = TRUE
  )

  test_that("model_info", {
    expect_true(model_info(m1)$is_binomial)
  })

  test_that("find_predictors", {
    expect_identical(find_predictors(m1), list(conditional = c("Age", "Number")))
    expect_identical(find_predictors(m1, flatten = TRUE), c("Age", "Number"))
    expect_null(find_predictors(m1, effects = "random"))
  })

  test_that("find_response", {
    expect_identical(find_response(m1), "Kyphosis")
  })

  test_that("link_inverse", {
    expect_equal(link_inverse(m1)(.2), plogis(.2), tolerance = 1e-5)
  })

  test_that("get_data", {
    expect_equal(nrow(get_data(m1)), 81)
    expect_equal(colnames(get_data(m1)), c("Kyphosis", "Age", "Number"))
  })

  test_that("find_formula", {
    expect_length(find_formula(m1), 1)
    expect_equal(
      find_formula(m1),
      list(conditional = as.formula("Kyphosis ~ s(Age, 4) + Number"))
    )
  })

  test_that("find_terms", {
    expect_equal(
      find_terms(m1),
      list(
        response = "Kyphosis",
        conditional = c("s(Age, 4)", "Number")
      )
    )
    expect_equal(
      find_terms(m1, flatten = TRUE),
      c("Kyphosis", "s(Age, 4)", "Number")
    )
  })

  test_that("find_variables", {
    expect_equal(
      find_variables(m1),
      list(
        response = "Kyphosis",
        conditional = c("Age", "Number")
      )
    )
    expect_equal(
      find_variables(m1, flatten = TRUE),
      c("Kyphosis", "Age", "Number")
    )
  })

  test_that("n_obs", {
    expect_equal(n_obs(m1), 81)
  })

  test_that("linkfun", {
    expect_false(is.null(link_function(m1)))
  })

  test_that("find_parameters", {
    expect_equal(
      find_parameters(m1),
      list(
        conditional = c("(Intercept)", "Number"),
        smooth_terms = "s(Age, 4)"
      )
    )
    expect_equal(nrow(get_parameters(m1)), 3)
    expect_equal(
      get_parameters(m1)$Parameter,
      c("(Intercept)", "Number", "s(Age, 4)")
    )
  })

  test_that("is_multivariate", {
    expect_false(is_multivariate(m1))
  })

  test_that("find_algorithm", {
    expect_equal(find_algorithm(m1), list(algorithm = "IWLS"))
  })

  test_that("find_statistic", {
    expect_identical(find_statistic(m1), "F-statistic")
  })
}