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;
  
  import static org.assertj.core.api.Assertions.assertThat;
  
  import org.junit.jupiter.api.Tag;
  import org.junit.jupiter.api.Test;
  
  @Tag("UnitTests")
  class PersistentCapabilitiesTest {
  
    @Test
    void shouldAllowAnEmptySetOfCapabilities() {
      Capabilities seen = new PersistentCapabilities();
  
      assertThat(seen).isEqualTo(new ImmutableCapabilities());
    }
  
    @Test
    void modifyingTheCapabilitiesThisPersistentCapabilitiesIsBasedOnDoesNotChangeOurView() {
      MutableCapabilities mutableCaps = new MutableCapabilities();
      Capabilities caps = new PersistentCapabilities(mutableCaps);
  
      mutableCaps.setCapability("cheese", "parmesan");
  
      assertThat(caps).isEqualTo(new ImmutableCapabilities());
    }
  
    @Test
    void shouldBePossibleToOverrideAValue() {
      Capabilities original = new ImmutableCapabilities("vegetable", "peas");
      Capabilities seen = new PersistentCapabilities(original).setCapability("vegetable", "carrots");
  
      assertThat(seen).isEqualTo(new ImmutableCapabilities("vegetable", "carrots"));
    }
  
    @Test
    void shouldActuallyBePersistent() {
      PersistentCapabilities original =
          new PersistentCapabilities(new ImmutableCapabilities("cheese", "cheddar"));
      Capabilities seen = original.setCapability("cheese", "orgu peynir");
  
      assertThat(original).isEqualTo(new ImmutableCapabilities("cheese", "cheddar"));
      assertThat(seen).isEqualTo(new ImmutableCapabilities("cheese", "orgu peynir"));
    }
  
    @Test
    void shouldAllowChainedCallsToSetCapabilities() {
      PersistentCapabilities caps =
          new PersistentCapabilities(new ImmutableCapabilities())
              .setCapability("one", 1)
              .setCapability("two", 2);
  
      assertThat(caps).isEqualTo(new ImmutableCapabilities("one", 1, "two", 2));
    }
  }
  