Does code return a visible or invisible object?
Use this to test whether a function returns a visible or invisible output. Typically you'll use this to check that functions called primarily for their side-effects return their data argument invisibly.
expect_invisible(call, label = NULL) expect_visible(call, label = NULL)
call |
A function call. |
label |
Used to customise failure messages. For expert use only. |
The evaluated call, invisibly.
expect_invisible(x <- 10)
expect_visible(x)
# Typically you'll assign the result of the expectation so you can
# also check that the value is as you expect.
greet <- function(name) {
message("Hi ", name)
invisible(name)
}
out <- expect_invisible(greet("Hadley"))
expect_equal(out, "Hadley")Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.