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fastutil extends the Java Collections Framework by providing type-specific maps, sets, lists, and queues with a small memory footprint and fast access and insertion; it provides also big (64-bit) arrays, sets and lists, sorting algorithms, fast, practical I/O classes for binary and text files, and facilities for memory mapping large files. Note that if you have both this jar and fastutil-core.jar in your dependencies, fastutil-core.jar should be excluded.

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package it.unimi.dsi.fastutil.ints;

import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

import org.junit.Test;

public class IntCollectionsTest {

	@Test
	public void testIsNotEmpty() {
		IntCollection test = IntCollections.asCollection(new IntIterable() {
			@Override
			public IntIterator iterator() {
				return IntSets.singleton(0).iterator();
			}
		});
		
		assertFalse(test.isEmpty());
	}

	@Test
	public void testEmpty() {
		IntCollection test = IntCollections.asCollection(new IntIterable() {
			@Override
			public IntIterator iterator() {
				return IntSets.EMPTY_SET.iterator();
			}
		});
		
		assertTrue(test.isEmpty());
	}
}