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.grid.security;
  
  import static java.nio.charset.StandardCharsets.UTF_8;
  import static org.assertj.core.api.Assertions.assertThat;
  import static org.openqa.selenium.remote.http.HttpMethod.GET;
  
  import java.net.HttpURLConnection;
  import java.util.Base64;
  import org.junit.jupiter.api.Test;
  import org.openqa.selenium.remote.http.HttpHandler;
  import org.openqa.selenium.remote.http.HttpRequest;
  import org.openqa.selenium.remote.http.HttpResponse;
  
  class BasicAuthenticationFilterTest {
  
    @Test
    void shouldAskAnUnauthenticatedRequestToAuthenticate() {
      HttpHandler handler =
          new BasicAuthenticationFilter("cheese", "cheddar").apply(req -> new HttpResponse());
  
      HttpResponse res = handler.execute(new HttpRequest(GET, "/"));
  
      assertThat(res.getStatus()).isEqualTo(HttpURLConnection.HTTP_UNAUTHORIZED);
      assertThat(res.getHeader("Www-Authenticate")).startsWith("Basic ");
      assertThat(res.getHeader("Www-Authenticate")).contains("Basic ");
    }
  
    @Test
    void shouldAllowAuthenticatedTrafficThrough() {
      HttpHandler handler =
          new BasicAuthenticationFilter("cheese", "cheddar").apply(req -> new HttpResponse());
  
      HttpResponse res =
          handler.execute(
              new HttpRequest(GET, "/")
                  .setHeader(
                      "Authorization",
                      "Basic "
                          + Base64.getEncoder().encodeToString("cheese:cheddar".getBytes(UTF_8))));
  
      assertThat(res.isSuccessful()).isTrue();
    }
  }
  