| /* |
| * Copyright (C) 2011 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package libcore.java.util; |
| |
| import java.io.Serializable; |
| import java.util.Collections; |
| import java.util.Enumeration; |
| import java.util.Iterator; |
| import java.util.ListIterator; |
| import java.util.NoSuchElementException; |
| import junit.framework.TestCase; |
| |
| public final class CollectionsTest extends TestCase { |
| |
| public void testEmptyEnumeration() { |
| Enumeration<Object> e = Collections.emptyEnumeration(); |
| assertFalse(e instanceof Serializable); |
| assertFalse(e.hasMoreElements()); |
| try { |
| e.nextElement(); |
| fail(); |
| } catch (NoSuchElementException expected) { |
| } |
| } |
| |
| public void testEmptyIterator() { |
| testEmptyIterator(Collections.emptyIterator()); |
| testEmptyIterator(Collections.emptyList().iterator()); |
| testEmptyIterator(Collections.emptySet().iterator()); |
| testEmptyIterator(Collections.emptyMap().keySet().iterator()); |
| testEmptyIterator(Collections.emptyMap().entrySet().iterator()); |
| testEmptyIterator(Collections.emptyMap().values().iterator()); |
| } |
| |
| private void testEmptyIterator(Iterator<?> i) { |
| assertFalse(i instanceof Serializable); |
| assertFalse(i.hasNext()); |
| try { |
| i.next(); |
| fail(); |
| } catch (NoSuchElementException expected) { |
| } |
| try { |
| i.remove(); |
| fail(); |
| } catch (IllegalStateException expected) { |
| } |
| } |
| |
| public void testEmptyListIterator() { |
| testEmptyListIterator(Collections.emptyListIterator()); |
| testEmptyListIterator(Collections.emptyList().listIterator()); |
| testEmptyListIterator(Collections.emptyList().listIterator(0)); |
| } |
| |
| private void testEmptyListIterator(ListIterator<?> i) { |
| assertFalse(i instanceof Serializable); |
| assertFalse(i.hasNext()); |
| assertFalse(i.hasPrevious()); |
| assertEquals(0, i.nextIndex()); |
| try { |
| i.next(); |
| fail(); |
| } catch (NoSuchElementException expected) { |
| } |
| assertEquals(-1, i.previousIndex()); |
| try { |
| i.previous(); |
| fail(); |
| } catch (NoSuchElementException expected) { |
| } |
| try { |
| i.add(null); |
| fail(); |
| } catch (UnsupportedOperationException expected) { |
| } |
| try { |
| i.remove(); |
| fail(); |
| } catch (IllegalStateException expected) { |
| } |
| } |
| } |