Add textContent attribute support to HtmlUnitDriver

Signed-off-by: Luke Inman-Semerau <luke.semerau@gmail.com>

Author: Toilal

common/src/web/simpleTest.html

@@ -6,6 +6,7 @@
 <h1>Heading</h1>
 
 <p id="oneline">A single line of text</p>
+<p id="hiddenline" style="visibility: hidden">A hidden line of text</p>
 
 <div id="multiline">
     <p>A div containing</p>

java/client/src/org/openqa/selenium/htmlunit/HtmlUnitWebElement.java

@@ -414,6 +414,10 @@ public String getAttribute(String name) {
       return null;
     }
 
+    if ("textContent".equalsIgnoreCase(lowerName)) {
+      return element.getTextContent();
+    }
+
     if ("value".equals(lowerName)) {
       if (element instanceof HtmlTextArea) {
         return ((HtmlTextArea) element).getText();

java/client/test/org/openqa/selenium/ElementAttributeTest.java

@@ -21,6 +21,7 @@
 import org.openqa.selenium.testing.Ignore;
 import org.openqa.selenium.testing.JUnit4TestBase;
 import org.openqa.selenium.testing.JavascriptEnabled;
+import org.openqa.selenium.testing.TestUtilities;
 
 import java.util.List;
 
@@ -35,6 +36,7 @@
 import static org.junit.Assert.assertThat;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
+import static org.junit.Assume.assumeFalse;
 import static org.openqa.selenium.testing.Ignore.Driver.IE;
 import static org.openqa.selenium.testing.Ignore.Driver.MARIONETTE;
 
@@ -239,6 +241,18 @@ public void testShouldTreatReadonlyAsAValue() {
     assertFalse(readonly.equals(notReadonly));
   }
 
+  @Test
+  public void testShouldReturnHiddenTextForTextContentAttribute() {
+    assumeFalse("IE before 9 doesn't handle textContent attribute", TestUtilities.isOldIe(driver));
+
+    driver.get(pages.simpleTestPage);
+
+    WebElement element = driver.findElement(By.id("hiddenline"));
+    String textContent = element.getAttribute("textContent");
+
+    assertEquals(textContent, "A hidden line of text");
+  }
+
   @Test
   public void testShouldGetNumericAtribute() {
     driver.get(pages.formPage);