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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.collections;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;
/**
* @author jonmv
*/
class IterablesTest {
@Test
void testEmpty() {
List<Integer> elements = new ArrayList<>();
Iterator<Integer> iterator = Iterables.reversed(elements).iterator();
assertFalse(iterator.hasNext());
assertThrows(NoSuchElementException.class, iterator::next);
assertThrows(IllegalStateException.class, iterator::remove);
}
@Test
void testIterator() {
List<Integer> elements = new ArrayList<>(List.of(1, 2, 3));
Iterator<Integer> iterator = Iterables.reversed(elements).iterator();
assertTrue(iterator.hasNext());
assertEquals(3, iterator.next());
iterator.remove();
assertThrows(IllegalStateException.class, iterator::remove);
assertTrue(iterator.hasNext());
assertEquals(2, iterator.next());
assertTrue(iterator.hasNext());
assertEquals(1, iterator.next());
iterator.remove();
assertThrows(IllegalStateException.class, iterator::remove);
assertThrows(NoSuchElementException.class, iterator::next);
assertEquals(List.of(2), elements);
}
}
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