Nothing
test_that("standardize_variable works on data frames", {
expect_error(standardize_variable("foo"))
expect_error(standardize_variable(mtcars, cyl), NA)
})
test_that("standardize_variable actually standardizes variables", {
standardized_variable <- standardize_variable(mtcars, cyl)$cyl
expect_equal(mean(standardized_variable), 0)
expect_equal(sd(standardized_variable), 1)
standardized_variables <- standardize_variable(mtcars, c(cyl, disp))
expect_equal(mean(standardized_variables$cyl), 0)
expect_equal(mean(standardized_variables$disp), 0)
expect_equal(sd(standardized_variables$cyl), 1)
expect_equal(sd(standardized_variables$disp), 1)
})
test_that("standardize_variable throws error for non-numeric variables", {
expect_error(standardize_variable(ho_et_al, condition))
})
test_that("suffix argument work as intended", {
scaled_dataset <-
mtcars %>%
standardize_variable(cyl, suffix = "foo")
expect_true("cyl_foo" %in% names(scaled_dataset))
scaled_dataset <-
mtcars %>%
standardize_variable(c(cyl, disp),
suffix = "foo")
expect_true("cyl_foo" %in% names(scaled_dataset))
expect_true("disp_foo" %in% names(scaled_dataset))
})
test_that("standardize_variable keeps grouping", {
dataset_grouped <-
dplyr::group_by(mtcars, cyl)
dataset_standardized <-
dataset_grouped %>%
standardize_variable(mpg)
expect_identical(dplyr::groups(dataset_standardized),
dplyr::groups(dataset_grouped))
})
test_that("standardize_variable is insensitive to grouping", {
dataset_grouped <-
dplyr::group_by(mtcars, cyl)
dataset_grouped_standardized <-
dataset_grouped %>%
standardize_variable(mpg) %>%
dplyr::ungroup()
dataset_notgrouped_standardized <-
mtcars %>%
standardize_variable(mpg)
expect_equal(dataset_grouped_standardized,
dataset_notgrouped_standardized)
})
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