public void testRemove2() throws BackingStoreException {
    assertNull(storage.toFolder());
    assertNull(storage.toPropertiesFile());

    pref.put("key", "value");
    pref.put("key1", "value1");

    pref.flush();
    assertNotNull(storage.toPropertiesFile());
    pref.remove("key");
    assertFalse(pref.properties.isEmpty());
    pref.flush();
    assertNotNull(storage.toPropertiesFile());
  }
  public void testClear() throws BackingStoreException {
    assertNull(storage.toFolder());
    assertNull(storage.toPropertiesFile());
    pref.put("key", "value");
    pref.put("key1", "value");
    pref.put("key2", "value");
    pref.put("key3", "value");
    pref.put("key5", "value");
    pref.flush();
    assertNotNull(storage.toPropertiesFile());

    pref.clear();
    pref.flush();
    assertNull(storage.toPropertiesFile());
  }
  public void testKeyRemovalFireEvent() throws Exception {
    pref.put("key", "value");
    pref.put("key0", "value10");
    pref.put("key1", "value11");

    pref.addPreferenceChangeListener(new PrefListener());
    pref.sync();
    assertEquals("value10", pref.get("key0", null));
    deleteStorageEntry("key0=value10");

    assertEquals(null, pref.get("key0", null));
    prefRemovedEvent.await();
    assertEquals(
        "No preference changed event was fired for key removal", 0, prefRemovedEvent.getCount());
  }
  public void testValueChangeFireEvent() throws Exception {
    pref.put("key0", "value10");
    pref.addPreferenceChangeListener(new PrefListener());
    pref.sync();
    assertEquals("value10", pref.get("key0", null));
    overrideStorageEntryWithNewData("key0=value0");

    assertEquals("value0", pref.get("key0", null));
    prefChangedEvent.await();
    assertEquals(
        "No preference changed event was fired for value change", 0, prefChangedEvent.getCount());
  }
  @RandomlyFails // FSException: Invalid lock (from flush)
  public void testRemoveNode() throws BackingStoreException {
    assertNull(storage.toFolder());
    assertNull(storage.toPropertiesFile());

    pref.put("key", "value");
    pref.node("subnode").put("key", "value");
    pref.flush();
    assertNotNull(storage.toPropertiesFile());
    assertNotNull(storage.toFolder());
    pref.removeNode();
    pref.flush();
    assertNull(storage.toPropertiesFile());
    assertNull(storage.toFolder());
    assertFalse(storage.existsNode());
    pref.sync();
  }
  public void testPreferencesEvents2() throws Exception {
    pref.addNodeChangeListener(new NodeListener());
    pref.addPreferenceChangeListener(new PrefListener());

    Preferences child = pref.node("a");
    nodeAddedEvent.await();
    assertEquals("Missing node added event", 0, nodeAddedEvent.getCount());
    pref.put("key", "value");
    prefChangedEvent.await();
    assertEquals("Missing preference change event", 0, prefChangedEvent.getCount());
    pref.remove("key");
    prefRemovedEvent.await();
    assertEquals("Missing preference removed event", 0, prefRemovedEvent.getCount());
    child.removeNode();
    nodeRemovedEvent.await();
    assertEquals("Missing node removed event", 0, nodeRemovedEvent.getCount());
  }
 private void storeEntry(String keyName, String oldValue) throws BackingStoreException {
   pref.put(keyName, oldValue);
   pref.flush();
 }