/*
 * (C) Copyright 2016 Boni Garcia (http://bonigarcia.github.io/)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package io.github.bonigarcia.wdm.test;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import org.junit.After;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ErrorCollector;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.phantomjs.PhantomJSDriver;
import org.openqa.selenium.support.ui.ExpectedConditions;
import org.openqa.selenium.support.ui.WebDriverWait;

import io.github.bonigarcia.wdm.PhantomJsDriverManager;

/**
 * Performance test using several concurrent PhantomJS browsers (headless).
 *
 * @author Boni Garcia (boni.gg@gmail.com)
 * @since 1.0.0
 */
public class PerformancePhantomJsTest {

  private static final int NUMBER_OF_BROWSERS = 5;
  private List<WebDriver> driverList = new ArrayList<>(NUMBER_OF_BROWSERS);

  @Rule
  public ErrorCollector errorCollector = new ErrorCollector();

  @BeforeClass
  public static void setupClass() {
    PhantomJsDriverManager.getInstance().setup();
  }

  @Before
  public void setupTest() {
    for (int i = 0; i < NUMBER_OF_BROWSERS; i++) {
      driverList.add(new PhantomJSDriver());
    }
  }

  @After
  public void teardown() {
    for (int i = 0; i < NUMBER_OF_BROWSERS; i++) {
      driverList.get(i).close();
    }
  }

  @Test
  public void test() throws InterruptedException {
    ExecutorService executor = Executors.newFixedThreadPool(NUMBER_OF_BROWSERS);
    final CountDownLatch latch = new CountDownLatch(NUMBER_OF_BROWSERS);

    for (final WebDriver driver : driverList) {
      executor.execute(new Runnable() {
        @Override
        public void run() {
          try {
            singleTestExcution(driver);
          } catch (Throwable e) {
            errorCollector.addError(e);
          } finally {
            latch.countDown();
          }
        }
      });
    }

    latch.await();
    executor.shutdown();
  }

  private void singleTestExcution(WebDriver driver) {
    WebDriverWait wait = new WebDriverWait(driver, 30); // 30 seconds of timeout
    driver.get("https://en.wikipedia.org/wiki/Main_Page"); // navigate to Wikipedia

    By searchInput = By.id("searchInput"); // search for "Software"
    wait.until(ExpectedConditions.presenceOfElementLocated(searchInput));
    driver.findElement(searchInput).sendKeys("Software");
    By searchButton = By.id("searchButton");

    wait.until(ExpectedConditions.elementToBeClickable(searchButton));
    driver.findElement(searchButton).click();

    wait.until(ExpectedConditions.textToBePresentInElementLocated(By.tagName("body"),
        "Computer software")); // assert that the resulting page contains a text
  }

}

Add performance test using concurrent PhtantomJS browsers