Overriding a Target programmatically - task not being executed

I am trying to write unit tests for my build.  Part of the build that I am testing would create a war, but I do not want a war to be created every time I run the tests.  However, I do want to see that the target to build the war was executed.

I am using jUnit to run the ant tasks and am trying to override the target that will create a war, replacing it with a simple property task that I can test against.  

The target I am testing looks like:

      <target name="determineDeployOrigin" >
                <if>
                        <equals arg1="${buildWar}" arg2="yes" />
                        <then>
                                <antcall target="createWar" />
                                <property name="deploy.origin" value="${deploy.dir}/${deploy.warname}" />
                        </then>
                        <else>
                                <property name="deploy.origin" value="${deploy.webcontent}" />
                        </else>
                </if>
        </target>

I am testing this logic in Junit, simply by asserting that "deploy.origin" and "executed.properly" are what I expect after overriding createWar:

   @Test
   public void determineWarDeployOrigin(){

      Target createWar = new Target();
      createWar.setName("createWar");
     
      Property createWarTestProperty = new Property();
      createWarTestProperty.setProject(project);
      createWarTestProperty.setName("executed.properly");
      createWarTestProperty.setValue("true");
     
      createWar.addTask(createWarTestProperty);

      if(project.getTargets().get("createWar") == null){
         fail("createWar target not found in web-deploy.xml");
      }
      project.addOrReplaceTarget("createWar", createWar);

      project.setProperty("buildWar", "yes");
      assertNull(project.getProperty("deploy.origin"));
      project.executeTarget("setLocalDeployProperties");
      project.executeTarget("determineDeployOrigin");

      assertEquals("true",project.getProperty("executed.properly"));
      assertEquals("C:/builds/local/dist/RCMii.war",project.getProperty("deploy.origin"))
   }

The problem is that "executed.properly" is always null, unless I explicitly call execute() on createWarTestProperty task.  Is there something that I am doing wrong in creating the createWar target?
Any suggestions are appreciated...