fails:FileTest.size? returns the size of the file if it exists and is not empty
fails:FileTest.size? accepts a String-like (to_str) parameter
fails:FileTest.size? accepts an object that has a #to_path method
fails:FileTest.size? returns nil if file_name doesn't exist or has 0 size
fails:FileTest.size? returns nil if file_name is empty
fails:FileTest.size? accepts a File argument
fails:FileTest.size returns the size of the file if it exists and is not empty
fails:FileTest.size accepts a String-like (to_str) parameter
fails:FileTest.size accepts an object that has a #to_path method
fails:FileTest.size raises an error if file_name doesn't exist
fails:FileTest.size returns 0 if the file is empty
fails:FileTest.size accepts a File argument
