set.seed(123)
data(mtcars)
model <-
  stats::lm(
    formula = wt ~ am * cyl * vs,
    data = mtcars
  )

test_that("model_parameters-rank_deficiency", {
  expect_message(model_parameters(model))
  params <- suppressMessages(model_parameters(model))
  expect_equal(params$Parameter, c("(Intercept)", "am", "cyl", "vs", "am:cyl", "am:vs"), tolerance = 1e-3)
  expect_equal(params$Coefficient, c(2.28908, -1.37908, 0.22688, -0.26158, 0.08062, 0.14987), tolerance = 1e-3)
})