Test.java

package com.freemindcafe.apache.velocity.sample1;

import java.io.StringWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.VelocityEngine;
import org.junit.Assert;

public class Test {
    
    @org.junit.Test
    public void test1() {
        VelocityEngine velocityEngineTest=new VelocityEngine();
        Map<String, String> valTypes = new HashMap<String, String>();
        valTypes.put("hasNewData", "Y");
        valTypes.put("hasMissingData", "N");
        //valTypes.put("customValType", "Y");   
        List<String> expressions = Arrays.asList("$hasNewData == 'Y' || $hasMissingData == 'Y'", "true", "false", "$hasNewData == 'Y' && $hasMissingData == 'Y'");
        List<String> expectedResults = Arrays.asList("true", "true" , "false", "false");
        List<String> actualResults = new ArrayList<String>();
        
        String templateExpression = "#if(%replace_this%)true #else false #end";
        expressions.forEach((expression)->{
            VelocityContext context = new VelocityContext();
            valTypes.forEach((valType,valid) -> {context.put(valType, valid);});
            StringWriter writer = new StringWriter();
            try {
                velocityEngineTest.evaluate(context, writer, "", templateExpression.replace("%replace_this%", expression));
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            actualResults.add(writer.toString().trim());
        });
        Assert.assertTrue(actualResults.equals(expectedResults));
        
    }


}