This function is used to perform assertions that an object
conforms to its expected structure and no basic assumptions
have been violated. Will throw an error if checks do not pass.
Arguments
- x
object to be validated.
- ...
additional arguments to pass to the specific validation method.
Value
Called for its side effect of validating x. Throws an error if any check
fails; otherwise returns invisibly (the exact value depends on the method,
typically invisible(TRUE) or invisible(NULL)).
