Add tests.
diff --git a/commons-vfs2/src/test/java/org/apache/commons/vfs2/VFSTest.java b/commons-vfs2/src/test/java/org/apache/commons/vfs2/VFSTest.java
index d53b9c0..ecc57e4 100644
--- a/commons-vfs2/src/test/java/org/apache/commons/vfs2/VFSTest.java
+++ b/commons-vfs2/src/test/java/org/apache/commons/vfs2/VFSTest.java
@@ -17,6 +17,8 @@
 
 package org.apache.commons.vfs2;
 
+import static org.junit.Assert.assertNotEquals;
+
 import java.nio.file.Paths;
 
 import org.apache.commons.vfs2.impl.StandardFileSystemManager;
@@ -51,4 +53,16 @@
         Assert.assertNotNull(VFS.getManager());
         Assert.assertNotEquals(fileSystemManager, VFS.getManager());
     }
+
+    @Test
+    public void testStaticClose() throws FileSystemException {
+        final FileSystemManager manager = VFS.getManager();
+        VFS.close();
+        assertNotEquals(manager, VFS.getManager());
+    }
+    @Test
+    public void testStaticCloseRepeatable() throws FileSystemException {
+        VFS.close();
+        VFS.close();
+    }
 }