// 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.sessionqueue.local;

import static java.net.HttpURLConnection.HTTP_INTERNAL_ERROR;
import static java.net.HttpURLConnection.HTTP_OK;
import static java.nio.charset.StandardCharsets.UTF_8;
import static java.util.concurrent.TimeUnit.SECONDS;
import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.fail;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertNotEquals;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.openqa.selenium.remote.Dialect.W3C;
import static org.openqa.selenium.testing.Safely.safelyCall;

import com.google.common.collect.ImmutableMap;
import java.net.URI;
import java.net.URISyntaxException;
import java.time.Duration;
import java.time.Instant;
import java.util.HashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.UUID;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.function.Supplier;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.Timeout;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.Arguments;
import org.junit.jupiter.params.provider.MethodSource;
import org.openqa.selenium.Capabilities;
import org.openqa.selenium.ImmutableCapabilities;
import org.openqa.selenium.SessionNotCreatedException;
import org.openqa.selenium.grid.data.CreateSessionResponse;
import org.openqa.selenium.grid.data.DefaultSlotMatcher;
import org.openqa.selenium.grid.data.RequestId;
import org.openqa.selenium.grid.data.Session;
import org.openqa.selenium.grid.data.SessionRequest;
import org.openqa.selenium.grid.data.SessionRequestCapability;
import org.openqa.selenium.grid.security.Secret;
import org.openqa.selenium.grid.sessionqueue.NewSessionQueue;
import org.openqa.selenium.grid.sessionqueue.remote.RemoteNewSessionQueue;
import org.openqa.selenium.grid.testing.PassthroughHttpClient;
import org.openqa.selenium.internal.Debug;
import org.openqa.selenium.internal.Either;
import org.openqa.selenium.json.Json;
import org.openqa.selenium.remote.SessionId;
import org.openqa.selenium.remote.http.Contents;
import org.openqa.selenium.remote.http.HttpClient;
import org.openqa.selenium.remote.http.HttpResponse;
import org.openqa.selenium.remote.tracing.DefaultTestTracer;
import org.openqa.selenium.remote.tracing.Tracer;
import org.openqa.selenium.support.ui.FluentWait;

@Timeout(60)
class LocalNewSessionQueueTest {

  private static final Json JSON = new Json();
  private static final Capabilities CAPS = new ImmutableCapabilities("browserName", "cheese");
  private static final Secret REGISTRATION_SECRET = new Secret("secret");
  private static final Instant LONG_AGO = Instant.parse("2007-01-03T21:49:10.00Z");
  private NewSessionQueue queue;
  private LocalNewSessionQueue localQueue;
  private SessionRequest sessionRequest;

  public void setup(Supplier<TestData> supplier) {
    TestData testData = supplier.get();
    this.queue = testData.queue;
    this.localQueue = testData.localQueue;

    this.sessionRequest =
        new SessionRequest(
            new RequestId(UUID.randomUUID()),
            Instant.now(),
            Set.of(W3C),
            Set.of(CAPS),
            Map.of(),
            Map.of());
  }

  public static Stream<Arguments> data() {
    Tracer tracer = DefaultTestTracer.createTracer();

    Set<Supplier<TestData>> toReturn = new LinkedHashSet<>();

    // Note: this method is called only once, so if we want each test to
    // be isolated, everything that they use has to be created via the
    // supplier. In particular, a shared event bus will cause weird
    // failures to happen.

    toReturn.add(
        () -> {
          LocalNewSessionQueue local =
              new LocalNewSessionQueue(
                  tracer,
                  new DefaultSlotMatcher(),
                  Duration.ofSeconds(1),
                  Duration.ofSeconds(Debug.isDebugging() ? 9999 : 5),
                  REGISTRATION_SECRET,
                  5);
          return new TestData(local, local);
        });

    toReturn.add(
        () -> {
          LocalNewSessionQueue local =
              new LocalNewSessionQueue(
                  tracer,
                  new DefaultSlotMatcher(),
                  Duration.ofSeconds(1),
                  Duration.ofSeconds(Debug.isDebugging() ? 9999 : 5),
                  REGISTRATION_SECRET,
                  5);

          HttpClient client = new PassthroughHttpClient(local);
          return new TestData(
              local, new RemoteNewSessionQueue(tracer, client, REGISTRATION_SECRET));
        });

    return toReturn.stream().map(Arguments::of);
  }

  @AfterEach
  public void shutdownQueue() {
    safelyCall(localQueue::close);
  }

  private void waitUntilAddedToQueue(SessionRequest request) {
    new FluentWait<>(request)
        .withTimeout(Duration.ofSeconds(5))
        .until(
            r ->
                queue.getQueueContents().stream()
                    .anyMatch(
                        sessionRequestCapability ->
                            sessionRequestCapability.getRequestId().equals(r.getRequestId())));
  }

  @ParameterizedTest
  @MethodSource("data")
  void shouldBeAbleToAddToQueueAndGetValidResponse(Supplier<TestData> supplier) {
    setup(supplier);

    AtomicBoolean isPresent = new AtomicBoolean(false);

    new Thread(
            () -> {
              waitUntilAddedToQueue(sessionRequest);
              isPresent.set(true);

              Capabilities capabilities = new ImmutableCapabilities("browserName", "chrome");
              SessionId sessionId = new SessionId("123");
              Session session =
                  new Session(
                      sessionId,
                      URI.create("https://example.com"),
                      CAPS,
                      capabilities,
                      Instant.now());
              CreateSessionResponse sessionResponse =
                  new CreateSessionResponse(
                      session,
                      JSON.toJson(
                              ImmutableMap.of(
                                  "value",
                                  ImmutableMap.of(
                                      "sessionId", sessionId,
                                      "capabilities", capabilities)))
                          .getBytes(UTF_8));

              queue.complete(sessionRequest.getRequestId(), Either.right(sessionResponse));
            })
        .start();

    HttpResponse httpResponse = queue.addToQueue(sessionRequest);

    assertThat(isPresent.get()).isTrue();
    assertEquals(HTTP_OK, httpResponse.getStatus());
  }

  @ParameterizedTest
  @MethodSource("data")
  void shouldBeAbleToAddToQueueWithTimeoutAndGetValidResponse(Supplier<TestData> supplier) {
    setup(supplier);

    SessionRequest sessionRequestWithTimeout =
        new SessionRequest(
            new RequestId(UUID.randomUUID()),
            Instant.now(),
            Set.of(W3C),
            Set.of(CAPS),
            Map.of(),
            Map.of());

    AtomicBoolean isPresent = new AtomicBoolean(false);

    new Thread(
            () -> {
              waitUntilAddedToQueue(sessionRequestWithTimeout);
              isPresent.set(true);

              Capabilities capabilities = new ImmutableCapabilities("browserName", "chrome");

              try {
                Thread.sleep(4000); // simulate session waiting in queue
              } catch (InterruptedException ignore) {
              }

              // remove request from queue
              Map<Capabilities, Long> stereotypes = new HashMap<>();
              stereotypes.put(new ImmutableCapabilities("browserName", "cheese"), 1L);
              queue.getNextAvailable(stereotypes);

              SessionId sessionId = new SessionId("123");
              Session session =
                  new Session(
                      sessionId,
                      URI.create("https://example.com"),
                      CAPS,
                      capabilities,
                      Instant.now());
              CreateSessionResponse sessionResponse =
                  new CreateSessionResponse(
                      session,
                      JSON.toJson(
                              ImmutableMap.of(
                                  "value",
                                  ImmutableMap.of(
                                      "sessionId", sessionId,
                                      "capabilities", capabilities)))
                          .getBytes(UTF_8));

              try {
                Thread.sleep(2000); // simulate session creation delay
              } catch (InterruptedException ignore) {
              }
              queue.complete(
                  sessionRequestWithTimeout.getRequestId(), Either.right(sessionResponse));
            })
        .start();

    HttpResponse httpResponse = queue.addToQueue(sessionRequestWithTimeout);

    assertThat(isPresent.get()).isTrue();
    assertEquals(HTTP_OK, httpResponse.getStatus());
  }

  @ParameterizedTest
  @MethodSource("data")
  void shouldBeAbleToAddToQueueWithTimeoutAndTimeoutResponse(Supplier<TestData> supplier) {
    setup(supplier);

    SessionRequest sessionRequestWithTimeout =
        new SessionRequest(
            new RequestId(UUID.randomUUID()),
            Instant.now(),
            Set.of(W3C),
            Set.of(CAPS),
            Map.of(),
            Map.of());

    AtomicBoolean isPresent = new AtomicBoolean(false);

    new Thread(
            () -> {
              waitUntilAddedToQueue(sessionRequestWithTimeout);
              isPresent.set(true);

              Capabilities capabilities = new ImmutableCapabilities("browserName", "chrome");

              try {
                Thread.sleep(5500); // simulate session waiting in queue
              } catch (InterruptedException ignore) {
              }

              SessionId sessionId = new SessionId("123");
              Session session =
                  new Session(
                      sessionId,
                      URI.create("https://example.com"),
                      CAPS,
                      capabilities,
                      Instant.now());
              CreateSessionResponse sessionResponse =
                  new CreateSessionResponse(
                      session,
                      JSON.toJson(
                              ImmutableMap.of(
                                  "value",
                                  ImmutableMap.of(
                                      "sessionId", sessionId,
                                      "capabilities", capabilities)))
                          .getBytes(UTF_8));

              queue.complete(
                  sessionRequestWithTimeout.getRequestId(), Either.right(sessionResponse));
            })
        .start();

    HttpResponse httpResponse = queue.addToQueue(sessionRequestWithTimeout);

    assertThat(isPresent.get()).isTrue();
    assertEquals(HTTP_INTERNAL_ERROR, httpResponse.getStatus());
  }

  @ParameterizedTest
  @MethodSource("data")
  void shouldBeAbleToAddToQueueAndGetErrorResponse(Supplier<TestData> supplier) {
    setup(supplier);

    new Thread(
            () -> {
              waitUntilAddedToQueue(sessionRequest);
              queue.complete(
                  sessionRequest.getRequestId(),
                  Either.left(new SessionNotCreatedException("Error")));
            })
        .start();

    HttpResponse httpResponse = queue.addToQueue(sessionRequest);

    assertEquals(HTTP_INTERNAL_ERROR, httpResponse.getStatus());
  }

  @ParameterizedTest
  @MethodSource("data")
  void shouldBeAbleToRemoveFromQueue(Supplier<TestData> supplier) {
    setup(supplier);

    Optional<SessionRequest> httpRequest = queue.remove(new RequestId(UUID.randomUUID()));

    assertFalse(httpRequest.isPresent());
  }

  @ParameterizedTest
  @MethodSource("data")
  void shouldBeClearQueue(Supplier<TestData> supplier) {
    setup(supplier);

    RequestId requestId = new RequestId(UUID.randomUUID());
    localQueue.injectIntoQueue(sessionRequest);

    int count = queue.clearQueue();

    assertEquals(1, count);
    assertFalse(queue.remove(requestId).isPresent());
  }

  @ParameterizedTest
  @MethodSource("data")
  void shouldBeAbleToGetQueueContents(Supplier<TestData> supplier) {
    setup(supplier);

    localQueue.injectIntoQueue(sessionRequest);

    List<Set<Capabilities>> response =
        queue.getQueueContents().stream()
            .map(SessionRequestCapability::getDesiredCapabilities)
            .collect(Collectors.toList());

    assertThat(response).hasSize(1);

    assertEquals(Set.of(CAPS), response.get(0));
  }

  @ParameterizedTest
  @MethodSource("data")
  void queueCountShouldBeReturnedWhenQueueIsCleared(Supplier<TestData> supplier) {
    setup(supplier);

    RequestId requestId = sessionRequest.getRequestId();
    localQueue.injectIntoQueue(sessionRequest);
    queue.remove(requestId);

    queue.retryAddToQueue(sessionRequest);

    int count = queue.clearQueue();

    assertEquals(1, count);
    assertFalse(queue.remove(requestId).isPresent());
  }

  @ParameterizedTest
  @MethodSource("data")
  void removingARequestIdThatDoesNotExistInTheQueueShouldNotBeAnError(Supplier<TestData> supplier) {
    setup(supplier);

    localQueue.injectIntoQueue(sessionRequest);
    Optional<SessionRequest> httpRequest = queue.remove(new RequestId(UUID.randomUUID()));

    assertFalse(httpRequest.isPresent());
  }

  @ParameterizedTest
  @MethodSource("data")
  void shouldBeAbleToAddAgainToQueue(Supplier<TestData> supplier) {
    setup(supplier);

    localQueue.injectIntoQueue(sessionRequest);

    Optional<SessionRequest> removed = queue.remove(sessionRequest.getRequestId());
    assertThat(removed).isPresent();

    boolean added = queue.retryAddToQueue(sessionRequest);
    assertTrue(added);
  }

  @ParameterizedTest
  @MethodSource("data")
  void shouldBeAbleToRetryRequest(Supplier<TestData> supplier) {
    setup(supplier);

    AtomicBoolean isPresent = new AtomicBoolean(false);
    AtomicBoolean retrySuccess = new AtomicBoolean(false);

    AtomicInteger count = new AtomicInteger(0);

    new Thread(
            () -> {
              while (count.get() <= 2) {
                waitUntilAddedToQueue(sessionRequest);

                count.incrementAndGet();
                Optional<SessionRequest> requestOptional =
                    this.queue.remove(sessionRequest.getRequestId());
                isPresent.set(requestOptional.isPresent());

                if (count.get() == 1 && requestOptional.isPresent()) {
                  retrySuccess.set(queue.retryAddToQueue(requestOptional.get()));
                  continue;
                }

                // Only if it was retried after an interval, the count is 2
                if (count.get() == 2) {
                  ImmutableCapabilities capabilities =
                      new ImmutableCapabilities("browserName", "edam");
                  try {
                    SessionId sessionId = new SessionId("123");
                    Session session =
                        new Session(
                            sessionId,
                            new URI("http://example.com"),
                            CAPS,
                            capabilities,
                            Instant.now());
                    CreateSessionResponse sessionResponse =
                        new CreateSessionResponse(
                            session,
                            JSON.toJson(
                                    ImmutableMap.of(
                                        "value",
                                        ImmutableMap.of(
                                            "sessionId", sessionId,
                                            "capabilities", capabilities)))
                                .getBytes(UTF_8));
                    queue.complete(sessionRequest.getRequestId(), Either.right(sessionResponse));
                  } catch (URISyntaxException e) {
                    throw new RuntimeException(e);
                  }
                }
              }
            })
        .start();

    HttpResponse httpResponse = queue.addToQueue(sessionRequest);

    assertThat(isPresent.get()).isTrue();
    assertThat(retrySuccess.get()).isTrue();
    assertEquals(HTTP_OK, httpResponse.getStatus());
  }

  @ParameterizedTest
  @MethodSource("data")
  @Timeout(5)
  void shouldBeAbleToHandleMultipleSessionRequestsAtTheSameTime(Supplier<TestData> supplier) {
    setup(supplier);

    AtomicBoolean processQueue = new AtomicBoolean(true);
    // Processing the queue in a thread
    new Thread(
            () -> {
              while (processQueue.get()) {
                Optional<SessionRequestCapability> first =
                    queue.getQueueContents().stream().findFirst();
                if (first.isPresent()) {
                  RequestId reqId = first.get().getRequestId();
                  queue.remove(reqId);
                  ImmutableCapabilities capabilities =
                      new ImmutableCapabilities("browserName", "chrome");
                  try {
                    SessionId sessionId = new SessionId(UUID.randomUUID());
                    Session session =
                        new Session(
                            sessionId,
                            new URI("https://example.com"),
                            CAPS,
                            capabilities,
                            Instant.now());
                    CreateSessionResponse sessionResponse =
                        new CreateSessionResponse(
                            session,
                            JSON.toJson(
                                    ImmutableMap.of(
                                        "value",
                                        ImmutableMap.of(
                                            "sessionId", sessionId,
                                            "capabilities", capabilities)))
                                .getBytes(UTF_8));
                    queue.complete(reqId, Either.right(sessionResponse));
                  } catch (URISyntaxException e) {
                    queue.complete(
                        reqId, Either.left(new SessionNotCreatedException(e.getMessage())));
                  }
                }
              }
            })
        .start();

    ExecutorService executor = Executors.newFixedThreadPool(2);

    Callable<HttpResponse> callable =
        () -> {
          SessionRequest sessionRequest =
              new SessionRequest(
                  new RequestId(UUID.randomUUID()),
                  Instant.now(),
                  Set.of(W3C),
                  Set.of(CAPS),
                  Map.of(),
                  Map.of());

          return queue.addToQueue(sessionRequest);
        };

    Future<HttpResponse> firstRequest = executor.submit(callable);
    Future<HttpResponse> secondRequest = executor.submit(callable);

    try {
      HttpResponse firstResponse = firstRequest.get(30, SECONDS);
      HttpResponse secondResponse = secondRequest.get(30, SECONDS);

      String firstResponseContents = Contents.string(firstResponse);
      String secondResponseContents = Contents.string(secondResponse);

      assertEquals(HTTP_OK, firstResponse.getStatus());
      assertEquals(HTTP_OK, secondResponse.getStatus());

      assertNotEquals(firstResponseContents, secondResponseContents);
    } catch (InterruptedException | ExecutionException | TimeoutException e) {
      fail("Could not create session");
    }

    executor.shutdown();
    processQueue.set(false);
  }

  @ParameterizedTest
  @MethodSource("data")
  @Timeout(5)
  void shouldBeAbleToTimeoutARequestOnRetry(Supplier<TestData> supplier) {
    setup(supplier);

    final SessionRequest request =
        new SessionRequest(
            new RequestId(UUID.randomUUID()),
            LONG_AGO,
            Set.of(W3C),
            Set.of(CAPS),
            Map.of(),
            Map.of());

    HttpResponse httpResponse = queue.addToQueue(request);

    assertEquals(HTTP_INTERNAL_ERROR, httpResponse.getStatus());
  }

  @ParameterizedTest
  @MethodSource("data")
  @Timeout(5)
  void shouldBeAbleToClearQueueAndRejectMultipleRequests(Supplier<TestData> supplier) {
    setup(supplier);

    ExecutorService executor = Executors.newFixedThreadPool(2);

    Callable<HttpResponse> callable =
        () -> {
          SessionRequest sessionRequest =
              new SessionRequest(
                  new RequestId(UUID.randomUUID()),
                  Instant.now(),
                  Set.of(W3C),
                  Set.of(CAPS),
                  Map.of(),
                  Map.of());
          return queue.addToQueue(sessionRequest);
        };

    Future<HttpResponse> firstRequest = executor.submit(callable);
    Future<HttpResponse> secondRequest = executor.submit(callable);

    int count = 0;

    while (count < 2) {
      count += queue.clearQueue();
    }

    try {
      HttpResponse firstResponse = firstRequest.get(30, SECONDS);
      HttpResponse secondResponse = secondRequest.get(30, SECONDS);

      assertEquals(HTTP_INTERNAL_ERROR, firstResponse.getStatus());
      assertEquals(HTTP_INTERNAL_ERROR, secondResponse.getStatus());

    } catch (InterruptedException | ExecutionException | TimeoutException e) {
      fail("Could not create session");
    }

    executor.shutdownNow();
  }

  @ParameterizedTest
  @MethodSource("data")
  void shouldBeAbleToReturnTheNextAvailableEntryThatMatchesAStereotype(
      Supplier<TestData> supplier) {
    setup(supplier);

    SessionRequest expected =
        new SessionRequest(
            new RequestId(UUID.randomUUID()),
            Instant.now(),
            Set.of(W3C),
            Set.of(new ImmutableCapabilities("browserName", "cheese", "se:kind", "smoked")),
            Map.of(),
            Map.of());
    localQueue.injectIntoQueue(expected);

    localQueue.injectIntoQueue(
        new SessionRequest(
            new RequestId(UUID.randomUUID()),
            Instant.now(),
            Set.of(W3C),
            Set.of(new ImmutableCapabilities("browserName", "peas", "se:kind", "mushy")),
            Map.of(),
            Map.of()));

    Map<Capabilities, Long> stereotypes = new HashMap<>();
    stereotypes.put(new ImmutableCapabilities("browserName", "cheese"), 1L);

    List<SessionRequest> returned = queue.getNextAvailable(stereotypes);

    assertThat(returned.get(0)).isEqualTo(expected);
  }

  @ParameterizedTest
  @MethodSource("data")
  void shouldBeAbleToReturnTheNextAvailableBatchThatMatchesStereotypes(
      Supplier<TestData> supplier) {
    setup(supplier);

    SessionRequest firstSessionRequest =
        new SessionRequest(
            new RequestId(UUID.randomUUID()),
            Instant.now(),
            Set.of(W3C),
            Set.of(new ImmutableCapabilities("browserName", "cheese", "se:kind", "smoked")),
            Map.of(),
            Map.of());

    SessionRequest secondSessionRequest =
        new SessionRequest(
            new RequestId(UUID.randomUUID()),
            Instant.now(),
            Set.of(W3C),
            Set.of(new ImmutableCapabilities("browserName", "peas", "se:kind", "smoked")),
            Map.of(),
            Map.of());

    SessionRequest thirdSessionRequest =
        new SessionRequest(
            new RequestId(UUID.randomUUID()),
            Instant.now(),
            Set.of(W3C),
            Set.of(new ImmutableCapabilities("browserName", "peas", "se:kind", "smoked")),
            Map.of(),
            Map.of());

    localQueue.injectIntoQueue(firstSessionRequest);
    localQueue.injectIntoQueue(secondSessionRequest);
    localQueue.injectIntoQueue(thirdSessionRequest);

    Map<Capabilities, Long> stereotypes = new HashMap<>();
    stereotypes.put(new ImmutableCapabilities("browserName", "cheese"), 2L);
    stereotypes.put(new ImmutableCapabilities("browserName", "peas"), 2L);

    List<SessionRequest> returned = queue.getNextAvailable(stereotypes);

    assertThat(returned.size()).isEqualTo(3);
    assertTrue(returned.contains(firstSessionRequest));
    assertTrue(returned.contains(secondSessionRequest));
    assertTrue(returned.contains(thirdSessionRequest));
  }

  @ParameterizedTest
  @MethodSource("data")
  void shouldNotReturnANextAvailableEntryThatDoesNotMatchTheStereotypes(
      Supplier<TestData> supplier) {
    setup(supplier);

    // Note that this is basically the same test as getting the entry
    // from queue, but we've cleverly reversed the entries, so the one
    // that doesn't match should be first in the queue.
    localQueue.injectIntoQueue(
        new SessionRequest(
            new RequestId(UUID.randomUUID()),
            Instant.now(),
            Set.of(W3C),
            Set.of(new ImmutableCapabilities("browserName", "peas", "se:kind", "mushy")),
            Map.of(),
            Map.of()));

    SessionRequest expected =
        new SessionRequest(
            new RequestId(UUID.randomUUID()),
            Instant.now(),
            Set.of(W3C),
            Set.of(new ImmutableCapabilities("browserName", "cheese", "se:kind", "smoked")),
            Map.of(),
            Map.of());
    localQueue.injectIntoQueue(expected);

    Map<Capabilities, Long> stereotypes = new HashMap<>();
    stereotypes.put(new ImmutableCapabilities("browserName", "cheese"), 1L);

    List<SessionRequest> returned = queue.getNextAvailable(stereotypes);

    assertThat(returned.get(0)).isEqualTo(expected);
  }

  static class TestData {
    public final LocalNewSessionQueue localQueue;
    public final NewSessionQueue queue;

    public TestData(LocalNewSessionQueue localQueue, NewSessionQueue queue) {
      this.localQueue = localQueue;
      this.queue = queue;
    }
  }
}
