if (requiet("lme4")) {
data(mtcars)
data(sleepstudy)
m1 <- lm(mpg ~ 1, data = mtcars)
m2 <- lm(mpg ~ gear, data = mtcars)
m3 <- lmer(Reaction ~ 1 + (Days | Subject), data = sleepstudy)
m4 <- lmer(Reaction ~ Days + (Days | Subject), data = sleepstudy)
m5 <- suppressWarnings(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))
})
}
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