code_calls_either: Check whether code calls one of two desired functions or...
In garrettgman/magrader: A simple checking scheme for tutor based on magrittr pipes

Description Usage Arguments Value Examples

'code_calls_either()' is designed to be used in a magrittr pipe. It will first check whether the code input has already failed a previous check. If it has not, 'code_calls_either()' will check to see whether the code calls at least one of the given objects or functions.

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code_calls_either(submission, call1, call2,
  message = paste("I expected to see a call to", call), warn = FALSE,
  praise = NULL)

`submission`	The code to check, as a character string, or the output of a previous check function. If you are using 'code_calls()' within a tutor document, set code to the special name '.answer'.
`call1`	The name of one of two functions or objects to check for as a character string.
`call2`	The name of one of two functions or objects to check for as a character string.
`message`	A character string of feedback to display if the code fails the check
`warn`	'TRUE' or 'FALSE': should grading continue if condition is unmet? If 'TRUE', 'code_calls()' will mark the submission as a warning and pass the submission to the next check in the checking pipe. In this case, 'code_calls()' will append the message to the list of messages to be displayed when checking completes.
`praise`	A character string of feedback to display if the code passes the check. If a submission receives more than one praise. When checking finishes, magrader will display all of the warnings and praises that have accumulated for a submission.

If the code passes the check, 'code_calls()' returns the original code. If the code fails the check, 'code_calls()' returns a failure object that contains a feedback message.

## Not run: 
"head(mtcars)" %>%
   code_calls_either("mtcars", "mpg")

# If in a tutor document
.answer %>%
   code_calls_either("mtcars", "mpg")

## End(Not run)