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.javascript;
  
  import static java.util.stream.Collectors.toList;
  import static org.junit.jupiter.api.DynamicTest.dynamicTest;
  
  import java.io.Closeable;
  import java.io.IOException;
  import java.net.MalformedURLException;
  import java.net.URL;
  import java.nio.file.Path;
  import java.util.Collection;
  import java.util.List;
  import java.util.function.Function;
  import java.util.function.Supplier;
  import org.junit.jupiter.api.AfterEach;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.DynamicTest;
  import org.junit.jupiter.api.TestFactory;
  import org.openqa.selenium.WebDriver;
  import org.openqa.selenium.build.InProject;
  import org.openqa.selenium.environment.GlobalTestEnvironment;
  import org.openqa.selenium.environment.InProcessTestEnvironment;
  import org.openqa.selenium.environment.TestEnvironment;
  import org.openqa.selenium.environment.webserver.AppServer;
  import org.openqa.selenium.testing.drivers.WebDriverBuilder;
  
  /** JUnit5 test base for Closure-based JavaScript tests. */
  class JavaScriptTestSuite {
  
    private final Supplier<WebDriver> driverSupplier;
  
    private final long timeout;
  
    private TestEnvironment testEnvironment;
  
    public JavaScriptTestSuite() {
      this.timeout = Math.max(0, Long.getLong("js.test.timeout", 0));
      this.driverSupplier = new DriverSupplier();
    }
  
    private static boolean isBazel() {
      return InProject.findRunfilesRoot() != null;
    }
  
    @BeforeEach
    public void setup() {
      testEnvironment = GlobalTestEnvironment.getOrCreate(InProcessTestEnvironment::new);
    }
  
    @AfterEach
    public void teardown() throws IOException {
      if (testEnvironment != null) {
        testEnvironment.stop();
      }
      if (driverSupplier != null) {
        ((Closeable) driverSupplier).close();
      }
    }
  
    @TestFactory
    public Collection<DynamicTest> dynamicTests() throws IOException {
      final Path baseDir = InProject.findProjectRoot();
      final Function<String, URL> pathToUrlFn =
          s -> {
            AppServer appServer = GlobalTestEnvironment.get().getAppServer();
            try {
              String url = "/" + s;
              if (isBazel() && !url.startsWith("/common/generated/")) {
                url = "/filez/selenium" + url;
              }
              return new URL(appServer.whereIs(url));
            } catch (MalformedURLException e) {
              throw new RuntimeException(e);
            }
          };
  
      List<Path> tests = TestFileLocator.findTestFiles();
      return tests.stream()
          .map(
              file -> {
                final String path = TestFileLocator.getTestFilePath(baseDir, file);
                String title = path.replaceAll(".html$", "");
                ClosureTestStatement testStatement =
                    new ClosureTestStatement(driverSupplier, path, pathToUrlFn, timeout);
  
                return dynamicTest(title, testStatement::evaluate);
              })
          .collect(toList());
    }
  
    private static class DriverSupplier implements Supplier<WebDriver>, Closeable {
  
      private volatile WebDriver driver;
  
      @Override
      public WebDriver get() {
        if (driver != null) {
          return driver;
        }
  
        synchronized (this) {
          if (driver == null) {
            driver = new WebDriverBuilder().get();
          }
        }
  
        return driver;
      }
  
      public void close() {
        if (driver != null) {
          driver.quit();
        }
      }
    }
  }
  