Recovering UsingFileSystemsMasterfs

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+//     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
+//     Unless required by applicable law or agreed to in writing,
+//     software distributed under the License is distributed on an
+//     KIND, either express or implied.  See the License for the
+//     specific language governing permissions and limitations
+//     under the License.
+= UsingFileSystemsMasterfs
+:jbake-type: wiki
+:jbake-tags: wiki, devfaq, needsreview
+:jbake-status: published
+:syntax: true
+:description: APITest SIGTest NetBeans
+:icons: font
+:source-highlighter: pygments
+:toc: left
+You can use the Filesystems API freely in unit tests. For example:
+[source, java]
+private FileObject d;
+protected void setUp() throws Exception {
+    clearWorkDir();
+    d = FileUtil.toFileObject(getWorkDir());
+    assertNotNull(d);
+If you try to run the above code, by default you will get an assertion error in setUp: `toFileObject` returns `null`. 
+This is because you need the "Master Filesystem module" available in order to translate Files into FileObjects. 
+Add to your `project.xml`:
+[source, xml]
+<!-- if not already there:
+            <test-dependencies>
+                <test-type>
+                    <name>unit</name>
+                    <test-dependency>
+                        <code-name-base>org.netbeans.modules.masterfs</code-name-base>
+                    </test-dependency>
+<!-- if not already there:
+                </test-type>
+            </test-dependencies>
+Changes made using the Filesystems API should fire change events synchronously, which is helpful for testing code which listens for file changes.