tests that show gunzip for non-file resources is broken

http://stackoverflow.com/questions/32500937/nullpointerexception-using-on-the-fly-version-of-gunzip-ant-task

src/tests/antunit/taskdefs/gunzip-test.xml

@@ -0,0 +1,62 @@
+<?xml version="1.0"?>
+<!--
+  Licensed to the Apache Software Foundation (ASF) under one or more
+  contributor license agreements.  See the NOTICE file distributed with
+  this work for additional information regarding copyright ownership.
+  The ASF licenses this file to You under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with
+  the License.  You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+-->
+<project default="antunit" xmlns:au="antlib:org.apache.ant.antunit">
+  <import file="../antunit-base.xml" />
+
+  <target name="setup">
+    <mkdir dir="${output}"/>
+  </target>
+  
+  <target name="testWithFileResourceToFile" depends="setup">
+    <gunzip dest="${output}/asf-logo.gif">
+      <file file="../../../etc/testcases/taskdefs/expected/asf-logo.gif.gz"/>
+    </gunzip>
+    <au:assertFilesMatch expected="../../../etc/testcases/asf-logo.gif"
+                         actual="${output}/asf-logo.gif"/>
+  </target>
+
+  <target name="testWithFileResourceToDirectory" depends="setup">
+    <gunzip dest="${output}">
+      <file file="../../../etc/testcases/taskdefs/expected/asf-logo.gif.gz"/>
+    </gunzip>
+    <au:assertFilesMatch expected="../../../etc/testcases/asf-logo.gif"
+                         actual="${output}/asf-logo.gif"/>
+  </target>
+
+  <target name="XtestWithNonFileResourceToFile" depends="setup">
+    <gunzip dest="${output}/greeting.txt">
+      <url url="http://ant.apache.org/webtest/gunzip/greeting.txt.gz"/>
+    </gunzip>
+    <get src="http://ant.apache.org/webtest/gunzip/greeting.txt"
+         dest="${output}/orig.greeting.txt"/>
+    <au:assertFilesMatch expected="${output}/orig.greeting.txt"
+                         actual="${output}/greeting.txt"/>
+  </target>
+
+  <target name="XtestWithNonFileResourceToDir" depends="setup">
+    <gunzip dest="${output}">
+      <url url="http://ant.apache.org/webtest/gunzip/greeting.txt.gz"/>
+    </gunzip>
+    <get src="http://ant.apache.org/webtest/gunzip/greeting.txt"
+         dest="${output}/orig.greeting.txt"/>
+    <au:assertFilesMatch expected="${output}/orig.greeting.txt"
+                         actual="${output}/greeting.txt"/>
+  </target>
+
+</project>
+