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 static org.assertj.core.api.Assertions.assertThatExceptionOfType;
  import static org.assertj.core.api.Assumptions.assumeThat;
  
  import com.google.common.collect.ImmutableSet;
  import java.util.Set;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  import org.openqa.selenium.testing.JupiterTestBase;
  
  class ScriptPinningTest extends JupiterTestBase {
  
    private JavascriptExecutor executor;
  
    @BeforeEach
    public void setUp() {
      assumeThat(driver).isInstanceOf(JavascriptExecutor.class);
  
      driver.get(pages.simpleTestPage);
  
      executor = (JavascriptExecutor) driver;
    }
  
    @Test
    void shouldAllowAScriptToBePinned() {
      ScriptKey hello = executor.pin("return 'I like cheese'");
  
      Object value = executor.executeScript(hello);
  
      assertThat(value).isEqualTo("I like cheese");
    }
  
    @Test
    void pinnedScriptsShouldBeAbleToTakeArguments() {
      ScriptKey hello = executor.pin("return arguments[0]");
  
      Object value = executor.executeScript(hello, "cheese");
  
      assertThat(value).isEqualTo("cheese");
    }
  
    @Test
    void shouldBeAbleToListAllPinnedScripts() {
      Set<ScriptKey> expected =
          ImmutableSet.of(
              executor.pin("return arguments[0];"),
              executor.pin("return 'cheese';"),
              executor.pin("return 42;"));
  
      Set<ScriptKey> pinned = executor.getPinnedScripts();
  
      assertThat(pinned).isEqualTo(expected);
    }
  
    @Test
    void shouldAllowAPinnedScriptToBeUnpinned() {
      ScriptKey cheese = executor.pin("return 'brie'");
      executor.unpin(cheese);
  
      assertThat(executor.getPinnedScripts()).doesNotContain(cheese);
    }
  
    @Test
    void callingAnUnpinnedScriptIsAnError() {
      ScriptKey cheese = executor.pin("return 'brie'");
      executor.unpin(cheese);
  
      assertThatExceptionOfType(JavascriptException.class)
          .isThrownBy(() -> executor.executeScript(cheese));
    }
  }
  