Cactus is used for Unit Testing of the source code which requires a Servlet Containers
meaning which requies HTTPServletRequest, HTTPServletResponse.

Step 1:

import org.apache.cactus.ServletTestCase;
import org.junit.Test;

public class YourCactusTest extends ServletTestCase {

 protected void setUp() throws Exception {
  Cache.reLoadCache();
 }
  
 @Test
 public void testFillPriceLines ()  {
  assertEquals(2, hboCount);
  assertEquals(3, premierCount);
 }
 
 @Test
 public void testFillPriceLinesOnlyHBO ()  {
  assertEquals(2, hboCount);
 }
}

Step 2:

Deploy your test in a Servlet Container and use the following URL to
run the Test.

http://host:port/yourApp/ServletRedirector?Cactus_Service=RUN_TEST
Or
http://host:port/yourApp/ServletTestRunner?suite=YourCactusTest

Step 3 :

Add the Following to web.xml

  <servlet>
    <servlet-name>ServletRedirector</servlet-name>
    <servlet-class>org.apache.cactus.server.ServletTestRedirector</servlet-class>
  </servlet>

  <servlet>
    <servlet-name>ServletTestRunner</servlet-name>
    <servlet-class>org.apache.cactus.server.runner.ServletTestRunner</servlet-class>
  </servlet>

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