This is a special case because NULL is a singleton so it's possible check for it either with expect_equal(x, NULL) or expect_type(x, "NULL").

expect_null(object, info = NULL, label = NULL)

## Arguments

object Object to test. Supports limited unquoting to make it easier to generate readable failures within a function or for loop. See quasi_label for more details. Extra information to be included in the message. This argument is soft-deprecated and should not be used in new code. Instead see alternatives in quasi_label. Used to customise failure messages. For expert use only.

Other expectations: comparison-expectations, equality-expectations, expect_error, expect_length, expect_match, expect_message, expect_named, expect_output, expect_silent, inheritance-expectations, logical-expectations
x <- NULL
#> y is not null.