TestPSet.java example

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 * to you 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
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package org.apache.jena.atlas.lib.persistent;

import static java.util.stream.Collectors.toSet;
import static org.apache.jena.ext.com.google.common.collect.Sets.newHashSet;

import org.junit.Assert;
import org.junit.Test;

public class TestPSet extends Assert {

	@Test
	public void plusAndMinusWorkCorrectly() {
		final Object testObject = new Object();
		final PersistentSet<Object> testSet = PSet.empty();
		assertFalse(testSet.contains(testObject));
		final PersistentSet<Object> nextSet = testSet.plus(testObject);
		assertTrue(nextSet.contains(testObject));
		final PersistentSet<Object> nextNextSet = nextSet.minus(testObject);
		assertFalse(nextNextSet.contains(testObject));
	}

	@Test
	public void streaming() {
		final Object testObject1 = new Object();
		final Object testObject2 = new Object();
		final PersistentSet<Object> testSet = PSet.empty().plus(testObject1).plus(testObject2);
		assertEquals(newHashSet(testObject1, testObject2), testSet.stream().collect(toSet()));
	}
}