package taglib;
 
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;
 
public class HelloWorldTag extends TagSupport {
 
	public int doStartTag() throws JspException {
		  
		try {
			pageContext.getOut().print("Hello World Start");
		} catch (Exception e) {
			throw new JspException(e.getMessage());
		}
		  
		return SKIP_BODY;
	}
 
	public int doEndTag() throws JspException {
		try {
			pageContext.getOut().print("Hello World End");
		} catch (Exception e) {
			throw new JspException(e.getMessage());
		}
		return EVAL_PAGE;
	}
		  
}

package test.taglib;
 
import javax.servlet.jsp.tagext.Tag;
import org.apache.cactus.*;
import taglib.HelloWorldTag;
 
public class HelloWorldTagTest extends JspTestCase {
 
    private HelloWorldTag tag;
 
    public HelloWorldTagTest(String theName) {
        super(theName);
    }
 
    public void setUp() {
        this.tag = new HelloWorldTag();
        this.tag.setPageContext(this.pageContext);
    }
 
    public void testDoStartTag() throws Exception {
         int result = this.tag.doStartTag();
         assertEquals(Tag.SKIP_BODY, result); 
    }
    
    public void testDoEndTag() throws Exception {
         int result = this.tag.doEndTag();
         assertEquals(Tag.EVAL_PAGE, result); 
    }
    
    public void endDoStartTag(WebResponse response) {
        assertContains(response, "Hello World Start");
    }
 
    public void endDoEndTag(WebResponse response) {
        assertContains(response, "Hello World End");
    }
    
    private void assertContains(WebResponse response, String str) {
     
        String text = response.getText();
        
        if (text.indexOf(str) < 0) {
            fail("指定された文字列がレスポンスに含まれていません。: [" + str + "]");
        }
    }
}