package org.apidesign.unionfs;

 import java.util.Arrays;

 import java.util.HashSet;

 import java.util.Set;

 import org.junit.After;

 import org.junit.AfterClass;

 import org.junit.Before;

 import org.junit.BeforeClass;

 import org.junit.Test;

 import org.openide.filesystems.FileObject;

 import static org.junit.Assert.*;

 import org.openide.filesystems.FileSystem;

 import org.xml.sax.SAXException;

 public class UnionFSTest {

     public UnionFSTest() {

     }

     @BeforeClass

     public static void setUpClass() throws Exception {

     }

     @AfterClass

     public static void tearDownClass() throws Exception {

     }

     @Before

     public void setUp() {

     }

     @After

     public void tearDown() {

     }

     @Test

     public void union() throws SAXException {

         FileSystem one = UnionFS.fromResource(UnionFSTest.class.getResource("fs-one.xml"));

         assertChildren("There is just one file in the folder", one, "Menu", "Open.instance");

         FileSystem two = UnionFS.fromResource(UnionFSTest.class.getResource("fs-two.xml"));

         assertChildren("There is just one file in the other folder", two, "Menu", "Close.instance");

         FileSystem union = UnionFS.union(one, two);

         assertChildren("There both in the union", union, "Menu", "Open.instance", "Close.instance");

     }

     private static void assertChildren(String msg, FileSystem fs, String folder, String... expect) {

         Set<String> names = new HashSet<String>();

         names.addAll(Arrays.asList(expect));

         FileObject fo = fs.getRoot().getFileObject(folder);

         assertNotNull(msg + " folder " + folder + " has to exist", fo);

         for (FileObject ch : fo.getChildren()) {

             names.remove(ch.getNameExt());

         }

         if (!names.isEmpty()) {

             fail(msg + " - expected files not found " + names);

         }

     }

 }