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.support.decorators;
  
  import static org.assertj.core.api.Assertions.assertThat;
  import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
  import static org.mockito.ArgumentMatchers.any;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.times;
  import static org.mockito.Mockito.verify;
  import static org.mockito.Mockito.verifyNoMoreInteractions;
  import static org.mockito.Mockito.when;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.function.Consumer;
  import java.util.function.Function;
  import org.junit.jupiter.api.Tag;
  import org.junit.jupiter.api.Test;
  import org.openqa.selenium.By;
  import org.openqa.selenium.Dimension;
  import org.openqa.selenium.NoSuchElementException;
  import org.openqa.selenium.OutputType;
  import org.openqa.selenium.Point;
  import org.openqa.selenium.Rectangle;
  import org.openqa.selenium.WebDriver;
  import org.openqa.selenium.WebElement;
  
  @Tag("UnitTests")
  class DecoratedWebElementTest {
  
    private static class Fixture {
  
      WebDriver originalDriver;
      WebDriver decoratedDriver;
      WebElement original;
      WebElement decorated;
  
      public Fixture() {
        original = mock(WebElement.class);
        originalDriver = mock(WebDriver.class);
        when(originalDriver.findElement(any())).thenReturn(original);
        decoratedDriver = new WebDriverDecorator<>().decorate(originalDriver);
        decorated = decoratedDriver.findElement(By.id("test"));
      }
    }
  
    @Test
    void canConvertDecoratedToString() {
      Fixture fixture = new Fixture();
      when(fixture.original.toString()).thenReturn("element");
      assertThat(fixture.decorated.toString()).isEqualTo("Decorated {element}");
    }
  
    private void verifyFunction(Consumer<WebElement> f) {
      Fixture fixture = new Fixture();
      f.accept(fixture.decorated);
      f.accept(verify(fixture.original, times(1)));
      verifyNoMoreInteractions(fixture.original);
    }
  
    private <R> void verifyFunction(Function<WebElement, R> f, R result) {
      Fixture fixture = new Fixture();
      when(f.apply(fixture.original)).thenReturn(result);
      assertThat(f.apply(fixture.decorated)).isEqualTo(result);
      R ignore = f.apply(verify(fixture.original, times(1)));
      verifyNoMoreInteractions(fixture.original);
    }
  
    private <R> void verifyDecoratingFunction(Function<WebElement, R> f, R result, Consumer<R> p) {
      Fixture fixture = new Fixture();
      when(f.apply(fixture.original)).thenReturn(result);
  
      R proxy = f.apply(fixture.decorated);
      assertThat(result).isNotSameAs(proxy);
      R ignore = f.apply(verify(fixture.original, times(1)));
      verifyNoMoreInteractions(fixture.original);
  
      p.accept(proxy);
      p.accept(verify(result, times(1)));
      verifyNoMoreInteractions(result);
    }
  
    @Test
    void click() {
      verifyFunction(WebElement::click);
    }
  
    @Test
    void submit() {
      verifyFunction(WebElement::submit);
    }
  
    @Test
    void sendKeys() {
      verifyFunction($ -> $.sendKeys("test"));
    }
  
    @Test
    void clear() {
      verifyFunction(WebElement::clear);
    }
  
    @Test
    void getTagName() {
      verifyFunction(WebElement::getTagName, "div");
    }
  
    @Test
    void getDomProperty() {
      verifyFunction($ -> $.getDomProperty("color"), "red");
    }
  
    @Test
    void getDomAttribute() {
      verifyFunction($ -> $.getDomAttribute("color"), "red");
    }
  
    @Test
    void getAttribute() {
      verifyFunction($ -> $.getAttribute("color"), "red");
    }
  
    @Test
    void isSelected() {
      verifyFunction(WebElement::isSelected, true);
    }
  
    @Test
    void isEnabled() {
      verifyFunction(WebElement::isEnabled, true);
    }
  
    @Test
    void getText() {
      verifyFunction(WebElement::getText, "test");
    }
  
    @Test
    void findElements() {
      Fixture fixture = new Fixture();
      WebElement originalElement1 = mock(WebElement.class);
      WebElement originalElement2 = mock(WebElement.class);
      List<WebElement> list = new ArrayList<>();
      list.add(originalElement1);
      list.add(originalElement2);
      when(fixture.original.findElements(By.id("test"))).thenReturn(list);
  
      List<WebElement> decoratedElementList =
          fixture.decoratedDriver.findElement(By.id("list")).findElements(By.id("test"));
      assertThat(originalElement1).isNotSameAs(decoratedElementList.get(0));
      assertThat(originalElement2).isNotSameAs(decoratedElementList.get(1));
      verify(fixture.original, times(1)).findElements(By.id("test"));
  
      decoratedElementList.get(0).isDisplayed();
      decoratedElementList.get(1).click();
      verify(originalElement1, times(1)).isDisplayed();
      verify(originalElement2, times(1)).click();
      verifyNoMoreInteractions(fixture.original);
      verifyNoMoreInteractions(originalElement1);
      verifyNoMoreInteractions(originalElement2);
    }
  
    @Test
    void findElement() {
      final WebElement found = mock(WebElement.class);
      verifyDecoratingFunction($ -> $.findElement(By.id("test")), found, WebElement::click);
    }
  
    @Test
    void findElementNotFound() {
      Fixture fixture = new Fixture();
      when(fixture.original.findElement(any())).thenThrow(NoSuchElementException.class);
  
      WebElement block = fixture.decoratedDriver.findElement(By.id("block"));
      assertThatExceptionOfType(NoSuchElementException.class)
          .isThrownBy(() -> block.findElement(By.id("test")));
    }
  
    @Test
    void isDisplayed() {
      verifyFunction(WebElement::isDisplayed, true);
    }
  
    @Test
    void getLocation() {
      verifyFunction(WebElement::getLocation, new Point(10, 20));
    }
  
    @Test
    void getSize() {
      verifyFunction(WebElement::getSize, new Dimension(30, 40));
    }
  
    @Test
    void getRect() {
      verifyFunction(WebElement::getRect, new Rectangle(new Point(10, 20), new Dimension(30, 44)));
    }
  
    @Test
    void getCssValue() {
      verifyFunction($ -> $.getCssValue("color"), "red");
    }
  
    @Test
    void getScreenshotAs() {
      verifyFunction($ -> $.getScreenshotAs(OutputType.BASE64), "");
    }
  }
  