Can someone help me to write JUnit for the below Java class in PowerMockito

Can someone help me to write JUnit for the below Java class in PowerMockito. I have written the below class to access the date present in page properties to the metadata. However metadata is added in head.html

import java.text.SimpleDateFormat;
import java.util.Date;
import org.apache.sling.api.resource.ValueMap;
import com.adobe.cq.sightly.WCMUse;
import com.day.cq.wcm.api.Page;

public class TrainingDate extends WCMUse{
    private Page pg;
    private String check;
    public void activate() throws Exception{
        pg =  getCurrentPage();
        Date date 
            = pg.getProperties().get("trainingdate",Date.class);

        SimpleDateFormat sdf 
            = new SimpleDateFormat("MM-dd-YYYY");
        check = sdf.format(date);
    }

    public String getCheck(){       
    return check;
    }
}