tests/testthat/test-speedlm.R

In insight: Easy Access to Model Information for Various Model Objects

skip_if_not_installed("speedglm")
data(iris)
data(mtcars)

m1 <- speedglm::speedlm(Sepal.Length ~ Petal.Width + Species, data = iris)
m2 <- speedglm::speedlm(log(mpg) ~ log(hp) + cyl + I(cyl^2) + poly(wt, degree = 2, raw = TRUE),
  data = mtcars
)

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

test_that("find_predictors", {
  expect_identical(find_predictors(m1), list(conditional = c("Petal.Width", "Species")))
  expect_identical(
    find_predictors(m1, flatten = TRUE),
    c("Petal.Width", "Species")
  )
  expect_null(find_predictors(m1, effects = "random"))
})

test_that("find_random", {
  expect_null(find_random(m1))
})

test_that("get_random", {
  expect_warning(get_random(m1))
})

test_that("find_response", {
  expect_identical(find_response(m1), "Sepal.Length")
})

test_that("get_response", {
  expect_equal(get_response(m1), iris$Sepal.Length, ignore_attr = TRUE)
})

test_that("get_predictors", {
  expect_identical(colnames(get_predictors(m1)), c("Petal.Width", "Species"))
})

test_that("link_inverse", {
  expect_equal(link_inverse(m1)(0.2), 0.2, tolerance = 1e-5)
})

test_that("linkfun", {
  expect_equal(link_function(m1)(0.2), 0.2, tolerance = 1e-5)
})

test_that("get_data", {
  expect_equal(nrow(get_data(m1)), 150)
  expect_identical(
    colnames(get_data(m1)),
    c("Sepal.Length", "Petal.Width", "Species")
  )
  expect_identical(colnames(get_data(m2)), c("mpg", "hp", "cyl", "wt"))
})

test_that("find_formula", {
  expect_length(find_formula(m1), 1)
  expect_equal(
    find_formula(m1),
    list(conditional = as.formula("Sepal.Length ~ Petal.Width + Species")),
    ignore_attr = TRUE
  )
  expect_equal(
    find_formula(m2),
    list(
      conditional = as.formula(
        "log(mpg) ~ log(hp) + cyl + I(cyl^2) + poly(wt, degree = 2, raw = TRUE)"
      )
    ),
    ignore_attr = TRUE
  )
})

test_that("find_variables", {
  expect_identical(
    find_variables(m1),
    list(
      response = "Sepal.Length",
      conditional = c("Petal.Width", "Species")
    )
  )
  expect_identical(
    find_variables(m1, flatten = TRUE),
    c("Sepal.Length", "Petal.Width", "Species")
  )
  expect_identical(
    find_variables(m2, flatten = TRUE),
    c("mpg", "hp", "cyl", "wt")
  )
})

test_that("n_obs", {
  expect_equal(n_obs(m1), 150)
  expect_equal(n_obs(m2), 32)
})

test_that("find_parameters", {
  expect_identical(
    find_parameters(m1),
    list(
      conditional = c(
        "(Intercept)",
        "Petal.Width",
        "Speciesversicolor",
        "Speciesvirginica"
      )
    )
  )
  expect_identical(
    find_parameters(m2),
    list(
      conditional = c(
        "(Intercept)",
        "log(hp)",
        "cyl",
        "I(cyl^2)",
        "poly(wt, degree = 2, raw = TRUE)1",
        "poly(wt, degree = 2, raw = TRUE)2"
      )
    )
  )
  expect_equal(nrow(get_parameters(m1)), 4)
  expect_identical(
    get_parameters(m1)$Parameter,
    c(
      "(Intercept)",
      "Petal.Width",
      "Speciesversicolor",
      "Speciesvirginica"
    )
  )
})

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

test_that("find_terms", {
  expect_identical(
    find_terms(m1),
    list(
      response = "Sepal.Length",
      conditional = c("Petal.Width", "Species")
    )
  )
  expect_identical(
    find_terms(m2),
    list(
      response = "log(mpg)",
      conditional = c(
        "log(hp)",
        "cyl",
        "I(cyl^2)",
        "poly(wt, degree = 2, raw = TRUE)"
      )
    )
  )
})

test_that("find_algorithm", {
  expect_identical(find_algorithm(m1), list(algorithm = "eigen"))
})

test_that("find_statistic", {
  expect_identical(find_statistic(m1), "t-statistic")
  expect_identical(find_statistic(m2), "t-statistic")
})