code: // Licensed to the Software Freedom Conservancy (SFC) under one
  // or more contributor license agreements.  See the NOTICE file
  // distributed with this work for additional information
  // regarding copyright ownership.  The SFC licenses this file
  // to you 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 org.openqa.selenium.environment.webserver;
  
  import static java.nio.charset.StandardCharsets.UTF_8;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  import static org.openqa.selenium.remote.http.Contents.string;
  
  import java.io.File;
  import java.io.IOException;
  import java.net.URL;
  import java.nio.file.Files;
  import java.time.Duration;
  import java.util.stream.StreamSupport;
  import org.junit.jupiter.api.AfterAll;
  import org.junit.jupiter.api.AfterEach;
  import org.junit.jupiter.api.BeforeAll;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  import org.openqa.selenium.By;
  import org.openqa.selenium.WebDriver;
  import org.openqa.selenium.remote.http.HttpClient;
  import org.openqa.selenium.remote.http.HttpMethod;
  import org.openqa.selenium.remote.http.HttpRequest;
  import org.openqa.selenium.remote.http.HttpResponse;
  import org.openqa.selenium.support.ui.WebDriverWait;
  import org.openqa.selenium.testing.drivers.WebDriverBuilder;
  
  public abstract class AppServerTestBase {
    private static final String APPCACHE_MIME_TYPE = "text/cache-manifest";
    private AppServer server;
    private static WebDriver driver;
  
    @BeforeAll
    public static void startDriver() {
      driver = new WebDriverBuilder().get();
    }
  
    @BeforeEach
    public void startServer() {
      server = createAppServer();
      server.start();
    }
  
    protected abstract AppServer createAppServer();
  
    @AfterEach
    public void stopServer() {
      server.stop();
    }
  
    @AfterAll
    public static void quitDriver() {
      driver.quit();
    }
  
    @Test
    void hostsStaticPages() {
      driver.get(server.whereIs("simpleTest.html"));
      assertEquals("Hello WebDriver", driver.getTitle());
    }
  
    @Test
    void servesNumberedPages() {
      driver.get(server.whereIs("page/1"));
      assertEquals("Page1", driver.getTitle());
  
      driver.get(server.whereIs("page/2"));
      assertEquals("Page2", driver.getTitle());
    }
  
    @Test
    void numberedPagesExcludeQuerystring() {
      driver.get(server.whereIs("page/1?foo=bar"));
      assertEquals("1", driver.findElement(By.id("pageNumber")).getText());
    }
  
    @Test
    void redirects() {
      driver.get(server.whereIs("redirect"));
      assertEquals("We Arrive Here", driver.getTitle());
      assertTrue(driver.getCurrentUrl().contains("resultPage"));
    }
  
    @Test
    void sleeps() {
      long before = System.currentTimeMillis();
      driver.get(server.whereIs("sleep?time=1"));
  
      long duration = System.currentTimeMillis() - before;
      assertTrue(duration >= 1000);
      assertTrue(duration < 1500);
      assertEquals("Slept for 1s", driver.findElement(By.tagName("body")).getText());
    }
  
    @Test
    void dealsWithUtf16() {
      driver.get(server.whereIs("encoding"));
      String pageText = driver.findElement(By.tagName("body")).getText();
      assertTrue(pageText.contains("\u05E9\u05DC\u05D5\u05DD"));
    }
  
    @Test
    void manifestHasCorrectMimeType() throws IOException {
      String url = server.whereIs("html5/test.appcache");
      HttpClient.Factory factory = HttpClient.Factory.createDefault();
      HttpClient client = factory.createClient(new URL(url));
      HttpResponse response = client.execute(new HttpRequest(HttpMethod.GET, url));
  
      System.out.printf("Content for %s was %s%n", url, string(response));
  
      assertTrue(
          StreamSupport.stream(response.getHeaders("Content-Type").spliterator(), false)
              .anyMatch(header -> header.contains(APPCACHE_MIME_TYPE)));
    }
  
    @Test
    void uploadsFile() throws Throwable {
      String FILE_CONTENTS = "Uploaded file";
      File testFile = File.createTempFile("webdriver", "tmp");
      testFile.deleteOnExit();
      Files.write(testFile.toPath(), FILE_CONTENTS.getBytes(UTF_8));
  
      driver.get(server.whereIs("upload.html"));
      driver.findElement(By.id("upload")).sendKeys(testFile.getAbsolutePath());
      driver.findElement(By.id("go")).submit();
  
      driver.switchTo().frame("upload_target");
      new WebDriverWait(driver, Duration.ofSeconds(10))
          .until(d -> d.findElement(By.xpath("//body")).getText().equals(FILE_CONTENTS));
    }
  }
  