/*
 * Copyright (C) 2009, Google Inc.
 * and other copyright owners as documented in the project's IP log.
 *
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Distribution License v1.0 which
 * accompanies this distribution, is reproduced below, and is
 * available at http://www.eclipse.org/org/documents/edl-v10.php
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 * All rights reserved.
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 * without modification, are permitted provided that the following
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 * - Redistributions of source code must retain the above copyright
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 * - Redistributions in binary form must reproduce the above
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 *   disclaimer in the documentation and/or other materials provided
 *   with the distribution.
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 * - Neither the name of the Eclipse Foundation, Inc. nor the
 *   names of its contributors may be used to endorse or promote
 *   products derived from this software without specific prior
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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package org.eclipse.jgit.revwalk;

public class AlwaysEmptyRevQueueTest extends RevWalkTestCase {
	private final AbstractRevQueue q = AbstractRevQueue.EMPTY_QUEUE;

	public void testEmpty() throws Exception {
		assertNull(q.next());
		assertTrue(q.everbodyHasFlag(RevWalk.UNINTERESTING));
		assertFalse(q.anybodyHasFlag(RevWalk.UNINTERESTING));
		assertEquals(0, q.outputType());
	}

	public void testClear() throws Exception {
		q.clear();
		testEmpty();
	}

	public void testAddFails() throws Exception {
		try {
			q.add(commit());
			fail("Did not throw UnsupportedOperationException");
		} catch (UnsupportedOperationException e) {
			// expected result
		}
	}
}