juneau-core/juneau-core-utest/src/test/java/org/apache/juneau/utils/MultiIterableTest.java

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package org.apache.juneau.utils;

import static org.apache.juneau.testutils.TestUtils.*;
import static org.junit.Assert.*;

import java.util.*;

import org.apache.juneau.*;
import org.apache.juneau.internal.*;
import org.junit.*;

public class MultiIterableTest {

	//====================================================================================================
	// Basic tests
	//====================================================================================================
	@SuppressWarnings({ "unchecked", "rawtypes" })
	@Test
	public void test() throws Exception {
		List
			l1 = new ObjectList(),
			l2 = new ObjectList("['a','b']"),
			l3 = new ObjectList("['c']");

		MultiIterable mi = new MultiIterable(l1.iterator(),l2.iterator());
		mi.append(l3.iterator());

		assertObjectEquals("['a','b','c']", mi.iterator());

		mi = new MultiIterable(l1.iterator());
		assertObjectEquals("[]", mi.iterator());

		mi = new MultiIterable(l2.iterator(), l1.iterator());
		assertObjectEquals("['a','b']", mi.iterator());

		mi = new MultiIterable(l2.iterator(), l1.iterator(), l3.iterator());
		assertObjectEquals("['a','b','c']", mi.iterator());

		mi = new MultiIterable();
		assertObjectEquals("[]", mi.iterator());

		try { mi.append(null); fail(); } catch (IllegalArgumentException e) {}

		mi = new MultiIterable(l1.iterator());
		try { mi.iterator().next(); fail(); } catch (NoSuchElementException e) {}

		mi = new MultiIterable(l1.iterator());
		Iterator i = mi.iterator();
		assertFalse(i.hasNext());
		try { i.remove(); fail(); } catch (NoSuchElementException e) {}

		mi = new MultiIterable(l2.iterator());
		i = mi.iterator();
		assertTrue(i.hasNext());
		assertEquals("a", i.next());
		i.remove();
	}
}