skip_if_not_installed("lme4")
data(sleepstudy, package = "lme4")
m1 <- lm(mpg ~ 1, data = mtcars)
m2 <- lm(mpg ~ gear, data = mtcars)
m3 <- lme4::lmer(Reaction ~ 1 + (Days | Subject), data = sleepstudy)
m4 <- lme4::lmer(Reaction ~ Days + (Days | Subject), data = sleepstudy)
m5 <- suppressWarnings(lme4::lmer(Reaction ~ 0 + (Days | Subject), data = sleepstudy))
test_that("is_nullmodel", {
expect_true(is_nullmodel(m1))
expect_false(is_nullmodel(m2))
expect_true(is_nullmodel(m3))
expect_false(is_nullmodel(m4))
expect_true(is_nullmodel(m5))
})
test_that("is_nullmodel, don't be verbose", {
expect_silent(is_nullmodel(lm(mtcars$mpg ~ 1)))
})
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