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= TestingThingsThatUseFileObjectDataObjectDataFolder
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:jbake-tags: wiki, devfaq, needsreview
:jbake-status: published
:keywords: Apache NetBeans wiki TestingThingsThatUseFileObjectDataObjectDataFolder
:description: Apache NetBeans wiki TestingThingsThatUseFileObjectDataObjectDataFolder
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== Testing Things That Use FileObject/DataObject/DataFolder

If your unit tests use `FileObject` (including `DataObject` or `DataFolder`), then you may be suprised that `FileUtil.toFileObject(java.util.File)` returns `null`. This is because the MasterFS filesystem implementation is what maps `FileObject`s to your local disk and it needs to be on the classpath when tests are run.

See link:UsingFileSystemsMasterfs.asciidoc[UsingFileSystemsMasterfs] for more info on how to fix this.

If for some reason you prefer not to use MasterFS, you can create a new `LocalFileSystem`, create some files and use that instead of `FileUtil.toFileObject` in your test.  For example, in a `NbTestCase` subclass:

[source,java]
----

FileObject dir;
public @Override void setUp() throws Exception {
  super.setUp();
  clearWorkDir();
  LocalFileSystem fs = new LocalFileSystem();
  fs.setRootDirectory(getWorkDir());
  dir = fs.getRoot();
}
----

If your test just needs some simple data in a FileObject or two, you can avoid writing to disk at all as follows:

[source,java]
----

FileObject dir;
public @Override void setUp() throws Exception {
  super.setUp();
  dir = FileUtil.createMemoryFileSystem().getRoot();
  //write out data your tests will use to files under dir/ here
}
----

If you want to write tests for a `DataObject` or `DataLoader`, you may also want to set the mime type correctly: link:DevFaqTestDataObject.asciidoc[DevFaqTestDataObject]

== Apache Migration Information

The content in this page was kindly donated by Oracle Corp. to the
Apache Software Foundation.

This page was exported from link:http://wiki.netbeans.org/TestingThingsThatUseFileObjectDataObjectDataFolder[http://wiki.netbeans.org/TestingThingsThatUseFileObjectDataObjectDataFolder] , 
that was last modified by NetBeans user Geertjan 
on 2011-05-13T13:08:00Z.


*NOTE:* This document was automatically converted to the AsciiDoc format on 2018-02-07, and needs to be reviewed.