test_that("can extract response from linear model", {
mod <- lm(mpg ~ wt, data = mtcars)
expect_identical(response_var(mod), quote(mpg))
})
test_that("can extract response from loess model", {
mod <- loess(mpg ~ wt, data = mtcars)
expect_identical(response_var(mod), quote(mpg))
})
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