need some example code on how to test variables and correctly throw errors or warnings when tests fal

[MashaPtukha]

stopping the code and throwing an error if condition is not met:

if (x != y) { stop("Error: x is not equal to y") }

throwing a warning if condition is not met, but continuing with the code execution:

if (x < 0) { warning("Warning: x is negative, which may lead to unexpected behavior.") }