/*
 * Copyright (C) 2009, Google Inc.
 *
 * All rights reserved.
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 * without modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
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 *   disclaimer in the documentation and/or other materials provided
 *   with the distribution.
 *
 * - Neither the name of the Git Development Community nor the
 *   names of its contributors may be used to endorse or promote
 *   products derived from this software without specific prior
 *   written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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package org.spearce.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
		}
	}
}