java-tutorials/javax-servlets/src/test/java/com/root/FormServletTest.java

package com.root;

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.junit.Test;

import java.util.ArrayList;
import java.util.List;

import static org.junit.Assert.assertEquals;

public class FormServletTest {

    @Test
    public void whenPostRequestUsingHttpClient_thenCorrect() throws Exception {

        HttpClient client = new DefaultHttpClient();
        HttpPost method = new HttpPost("http://localhost:8080/calculateServlet");

        List<BasicNameValuePair> nvps = new ArrayList<BasicNameValuePair>();
        nvps.add(new BasicNameValuePair("height", String.valueOf(2)));
        nvps.add(new BasicNameValuePair("weight", String.valueOf(80)));

        method.setEntity(new UrlEncodedFormEntity(nvps));
        HttpResponse httpResponse = client.execute(method);

        assertEquals("Success", httpResponse.getHeaders("Test")[0].getValue());
        assertEquals("20.0", httpResponse.getHeaders("BMI")[0].getValue());
    }
}