How do i write the test cases for this class

EnhancedUnit.java

public class EnhancedUnit extends Unit { // Declare the fields private String specialRule; // Define the constructor public EnhancedUnit(String name, int points) { super(name, points); this.specialRule = null; } // Define the getter methods public String getSpecialRule() { return this.specialRule; } // Define the setter methods public void setSpecialRule(String specialRule) { this.specialRule = specialRule; } }