Check whether the library function was called correctly

Source: R/check-library-function.R

Convenience function to test in a very hacky way whether the library function was called correctly in its most simple form. There is support for the different ways to call the library function

check_library(state, package, not_called_msg = NULL,
  incorrect_msg = NULL)

Arguments

state

state to start from
package

package name for which the library() function should've been called
not_called_msg

optional feedback message in case the library function wasn't called a single time
incorrect_msg

optional feedback message in case the library function wasn't called for the specified package.

Examples

if (FALSE) {
# example solution
library(ggvis)

# sct to test whether ggvis was loaded
ex() %>% check_library("ggvis")
}