How do you test code that uses TreeMap?

// Example of using TreeMap in Java
import java.util.TreeMap;

public class TreeMapExample {
    public static void main(String[] args) {
        // Create a TreeMap
        TreeMap map = new TreeMap<>();

        // Add some entries
        map.put("Apple", 3);
        map.put("Banana", 2);
        map.put("Grapes", 5);

        // Access and print the size of the TreeMap
        System.out.println("Size of TreeMap: " + map.size()); // Output: 3

        // Iterate through the keys and values
        for (String key : map.keySet()) {
            System.out.println(key + " => " + map.get(key));
        }

        // Remove an entry
        map.remove("Banana");
        System.out.println("After removing Banana, size: " + map.size()); // Output: 2
    }
}