test_that("can add an intercept column", {
x <- add_intercept_column(mtcars)
expect_equal(colnames(x)[1], "(Intercept)")
expect_type(x[, 1], "integer")
xx <- add_intercept_column(as.matrix(mtcars))
expect_matrix(xx)
expect_equal(colnames(xx)[1], "(Intercept)")
})
test_that("existing intercepts are skipped with a warning", {
x <- add_intercept_column(mtcars)
expect_snapshot({
xx <- add_intercept_column(x)
})
expect_equal(
xx,
x
)
})
test_that("can change the intercept column name", {
x <- add_intercept_column(mtcars, name = "intercept")
expect_equal(colnames(x)[1], "intercept")
})
test_that("name can only be a single character", {
expect_snapshot(error = TRUE, {
add_intercept_column(mtcars, name = c("x", "y"))
})
expect_snapshot(error = TRUE, {
add_intercept_column(mtcars, name = 1)
})
})
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