title: Commons-vfs mocking up a filesystem
body: <p>I'm trying to use commons-vfs as a filesystem wrapper in order to more easily unit test some code that needs to touch the filesystem. Right now I'm just getting familiar with the API. What I would like to do is create a virtual filesystem, and add a couple of files (a folder and then a file in that folder to the root). </p>
  
  <p>Here's a test class I've written to testdrive the API:</p>
  
  <pre><code>public class CommonsVfsLearningSpikeTest extends Base {
  FileSystemManager fsManager;
  FileObject rootVFS;
  
  @Before public void createFixture() throws Exception{
      this.fsManager = VFS.getManager();
      this.rootVFS = fsManager.createVirtualFileSystem("rootVfs");
  }
  
  @Test public void testCreationOfDefaultFileSystem() throws Exception {
      assertNotNull(fsManager);
  }
  
  @Test public void testCreationOfVFS() throws Exception {
      //root file has an empty base name
      assertEquals("", rootVFS.getName().getBaseName());
  }
  
  @Test public void testCreationOfChildrenFiles() throws Exception {
      FileObject childFolder = rootVFS.resolveFile("childFolder");
      childFolder.createFolder();
      assertNotNull(childFolder );
  
      FileObject childFile = rootVFS.resolveFile("childFolder/childFile");
      childFile.createFile();
      assertNotNull(childFile);
  
  }   
  </code></pre>
  
  <p>}</p>
  
  <p>Currently I'm getting the following error:</p>
  
  <blockquote>
  <pre><code>[junit] Testcase: testCreationOfChildrenFiles(com.usengineeringsolutions.bridgewatch.vfs.CommonsVfsLearningSpikeTest):      Caused an ERROR
  [junit] Incorrect file system URI "file:///" in name "file:///rootVfs/childFolder", was expecting "/rootVfs/".
  [junit] org.apache.commons.vfs.FileSystemException: Incorrect file system URI "file:///" in name "file:///rootVfs/childFolder", was expecting "/rootVfs/".
  [junit]     at org.apache.commons.vfs.provider.AbstractFileSystem.resolveFile(AbstractFileSystem.java:274)
  [junit]     at org.apache.commons.vfs.provider.AbstractFileSystem.resolveFile(AbstractFileSystem.java:267)
  [junit]     at org.apache.commons.vfs.provider.AbstractFileObject.resolveFile(AbstractFileObject.java:670)
  [junit]     at com.usengineeringsolutions.bridgewatch.vfs.CommonsVfsLearningSpikeTest.testCreationOfChildrenFiles(CommonsVfsLearningSpikeTest.java:27)
  [junit]
  [junit]
  </code></pre>
  </blockquote>