test_that("na.warn warns when dropping", {
df <- data.frame(x = 1:5, y = c(1, NA, 3, NA, 5))
expect_warning(mod <- lm(y ~ x, data = df, na.action = na.warn), "Dropping 2")
pred <- unname(predict(mod))
expect_equal(is.na(pred), is.na(df$y))
})
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