Add test case for <input type="file">. Doesn't work with HttpUnit (internal bug). (Missing commit)

Author: henryju

jwebunit-commons-tests/src/main/resources/testcases/FormSubmissionTest/SingleNamedButtonForm.html

@@ -7,6 +7,7 @@
 		<input type="checkbox" name="checkBox" />
 		<input type="submit" name="button">
 		<input type="hidden" name="myReferer" value="FormSubmissionTest/SingleNamedButtonForm.html">
+		<input type="file" name="file" />
 	</form>
 </body>
 </html>