Fix assertion in ValueBox.<init>

Author: j.schmied@pay-co.net

gwtmockito/src/main/java/com/google/gwtmockito/impl/ReturnsCustomMocks.java

@@ -17,6 +17,7 @@
 
 import com.google.gwt.core.client.JavaScriptObject;
 import com.google.gwt.dom.client.Element;
+import com.google.gwt.dom.client.InputElement;
 
 import org.mockito.internal.stubbing.defaultanswers.ReturnsMocks;
 import org.mockito.invocation.InvocationOnMock;
@@ -42,6 +43,8 @@ public Object answer(InvocationOnMock invocation) throws Throwable {
     } else if (invocation.getMock() instanceof Element && methodName.equals("getTagName")) {
       String className = invocation.getMock().getClass().getSimpleName();
       return className.substring(0, className.indexOf("Element")).toLowerCase();
+		} else if (invocation.getMock() instanceof InputElement && methodName.equals("getType")) {
+			return "text";
     } else {
       return super.answer(invocation);
     }