fix tests. fixed a bug in context() introduced in #101

Author: Jonahss

src/main/java/io/appium/java_client/AppiumDriver.java

@@ -664,7 +664,7 @@ public void ignoreUnimportantViews(Boolean compress) {
 
   @Override
   public WebDriver context(String name) {
-    if (_isNotNullOrEmpty(name)) {
+    if (!_isNotNullOrEmpty(name)) {
       throw new IllegalArgumentException("Must supply a context name");
     }
 

src/test/java/io/appium/java_client/AndroidGestureTest.java

@@ -68,6 +68,10 @@ public void MultiGestureSingleActionTest() throws InterruptedException {
 
   @Test
   public void dragNDropTest() {
+
+    driver.findElementByAndroidUIAutomator("new UiScrollable(new UiSelector().scrollable(true).instance(0)).scrollIntoView(new UiSelector().description(\"Views\"))");
+    driver.findElementByAccessibilityId("Views").click();
+
 	  driver.findElement(MobileBy.AndroidUIAutomator("description(\"Drag and Drop\")")).click();
 	  WebElement actionBarTitle = driver.findElement(By.id("android:id/action_bar_title"));