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)



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.

See also


x <- NULL y <- 10 expect_null(x) show_failure(expect_null(y))
#> Failed expectation: #> `y` is not null.