Implementing switch to parent frame in HtmlUnitDriver

Author: barancev

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

@@ -1184,7 +1184,8 @@ public WebDriver frame(WebElement frameElement) {
     }
 
     public WebDriver parentFrame() {
-      throw new UnsupportedOperationException();
+      currentWindow = currentWindow.getParentWindow();
+      return HtmlUnitDriver.this;
     }
 
     public WebDriver window(String windowId) {

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

@@ -271,7 +271,7 @@ public void testShouldThrowAnExceptionWhenAFrameCannotBeFoundByIndex() {
     }
   }
 
-  @Ignore({ANDROID, CHROME, HTMLUNIT, FIREFOX, IE, OPERA, OPERA_MOBILE, PHANTOMJS, SAFARI, MARIONETTE})
+  @Ignore({ANDROID, CHROME, FIREFOX, IE, OPERA, OPERA_MOBILE, PHANTOMJS, SAFARI, MARIONETTE})
   @Test
   public void testShouldBeAbleToSwitchToParentFrame() {
     driver.get(pages.framesetPage);
@@ -280,7 +280,7 @@ public void testShouldBeAbleToSwitchToParentFrame() {
     assertThat(driver.findElement(By.id("pageNumber")).getText(), equalTo("1"));
   }
 
-  @Ignore({ANDROID, CHROME, HTMLUNIT, FIREFOX, IE, OPERA, OPERA_MOBILE, PHANTOMJS, SAFARI, MARIONETTE})
+  @Ignore({ANDROID, CHROME, FIREFOX, IE, OPERA, OPERA_MOBILE, PHANTOMJS, SAFARI, MARIONETTE})
   @Test
   public void testShouldBeAbleToSwitchToParentFrameFromASecondLevelFrame() {
     driver.get(pages.framesetPage);
@@ -290,7 +290,7 @@ public void testShouldBeAbleToSwitchToParentFrameFromASecondLevelFrame() {
     assertThat(driver.findElement(By.id("pageNumber")).getText(), equalTo("11"));
   }
 
-  @Ignore({ANDROID, CHROME, HTMLUNIT, FIREFOX, IE, OPERA, OPERA_MOBILE, PHANTOMJS, SAFARI, MARIONETTE})
+  @Ignore({ANDROID, CHROME, FIREFOX, IE, OPERA, OPERA_MOBILE, PHANTOMJS, SAFARI, MARIONETTE})
   @Test
   public void testSwitchingToParentFrameFromDefaultContextIsNoOp() {
     driver.get(pages.xhtmlTestPage);