juneau-utest/src/test/java/org/apache/juneau/utils/MultiSetTest.java

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package org.apache.juneau.utils;

import static org.apache.juneau.assertions.Assertions.*;
import static org.junit.Assert.*;
import static org.junit.runners.MethodSorters.*;

import java.util.*;

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

@FixMethodOrder(NAME_ASCENDING)
public class MultiSetTest {

	@Test
	public void doTest() throws Exception {
		List<String> l1, l2;
		MultiSet<String> ms;

		l1 = Arrays.asList(new String[]{"1","2"});
		l2 = Arrays.asList(new String[]{"3","4"});
		ms = new MultiSet<>(l1, l2);
		Iterator<String> i1 = ms.iterator();
		assertTrue(i1.hasNext());
		assertEquals("1", i1.next());
		assertTrue(i1.hasNext());
		assertEquals("2", i1.next());
		assertTrue(i1.hasNext());
		assertEquals("3", i1.next());
		assertTrue(i1.hasNext());
		assertEquals("4", i1.next());
		assertFalse(i1.hasNext());
		assertThrown(()->i1.next()).isType(NoSuchElementException.class);

		l1 = Arrays.asList(new String[]{"1","2"});
		l2 = Arrays.asList(new String[]{});
		ms = new MultiSet<>(l1, l2);
		Iterator<String> i2 = ms.iterator();
		assertTrue(i2.hasNext());
		assertEquals("1", i2.next());
		assertTrue(i2.hasNext());
		assertEquals("2", i2.next());
		assertFalse(i2.hasNext());
		assertThrown(()->i2.next()).isType(NoSuchElementException.class);

		l1 = Arrays.asList(new String[]{});
		l2 = Arrays.asList(new String[]{"3","4"});
		ms = new MultiSet<>(l1, l2);
		Iterator<String> i3 = ms.iterator();
		assertTrue(i3.hasNext());
		assertEquals("3", i3.next());
		assertTrue(i3.hasNext());
		assertEquals("4", i3.next());
		assertFalse(i3.hasNext());
		assertThrown(()->i3.next()).isType(NoSuchElementException.class);

		l1 = Arrays.asList(new String[]{});
		l2 = Arrays.asList(new String[]{});
		ms = new MultiSet<>(l1, l2);
		Iterator<String> i4 = ms.iterator();
		assertFalse(i4.hasNext());
		assertThrown(()->i4.next()).isType(NoSuchElementException.class);

		l1 = Arrays.asList(new String[]{"1","2"});
		ms = new MultiSet<>(l1);
		Iterator<String> i5 = ms.iterator();
		assertTrue(i5.hasNext());
		assertEquals("1", i5.next());
		assertTrue(i5.hasNext());
		assertEquals("2", i5.next());
		assertFalse(i5.hasNext());
		assertThrown(()->i5.next()).isType(NoSuchElementException.class);

		l1 = new LinkedList<>(Arrays.asList(new String[]{"1","2"}));
		l2 = new LinkedList<>(Arrays.asList(new String[]{"3","4"}));
		ms = new MultiSet<>(l1, l2);
		assertObject(ms).asJson().is("['1','2','3','4']");
		assertObject(ms.enumerator()).asJson().is("['1','2','3','4']");
		assertEquals(4, ms.size());

		Iterator<String> t = ms.iterator();
		t.next();
		t.remove();
		assertObject(ms.enumerator()).asJson().is("['2','3','4']");

		t = ms.iterator();
		t.next();
		t.remove();
		assertObject(ms.enumerator()).asJson().is("['3','4']");

		t = ms.iterator();
		t.next();
		t.remove();
		assertObject(ms.enumerator()).asJson().is("['4']");

		t = ms.iterator();
		t.next();
		t.remove();
		assertObject(ms.enumerator()).asJson().is("[]");
		assertEquals(0, ms.size());

		ms = new MultiSet<>();
		assertObject(ms).asJson().is("[]");
		assertEquals(0, ms.size());

		assertThrown(()->new MultiSet<>((Collection<String>)null)).isType(IllegalArgumentException.class);
		assertThrown(()->new MultiSet<String>().iterator().next()).isType(NoSuchElementException.class);
		assertThrown(()->new MultiSet<String>().iterator().remove()).isType(NoSuchElementException.class);

	}
}