xref: /external/apache-harmony/luni/src/test/api/common/org/apache/harmony/luni/tests/java/util/HashSetTest.java

/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file 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
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.apache.harmony.luni.tests.java.util;

import java.util.Arrays;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import java.io.ObjectOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.Serializable;
import java.lang.reflect.Method;
import java.lang.reflect.InvocationTargetException;

import org.apache.harmony.testframework.serialization.SerializationTest;

public class HashSetTest extends junit.framework.TestCase {

	HashSet hs;

	static Object[] objArray;
	{
		objArray = new Object[1000];
		for (int i = 0; i < objArray.length; i++)
			objArray[i] = new Integer(i);
	}

	/**
	 * @tests java.util.HashSet#HashSet()
	 */
	public void test_Constructor() {
		// Test for method java.util.HashSet()
		HashSet hs2 = new HashSet();
		assertEquals("Created incorrect HashSet", 0, hs2.size());
	}

	/**
	 * @tests java.util.HashSet#HashSet(int)
	 */
	public void test_ConstructorI() {
		// Test for method java.util.HashSet(int)
		HashSet hs2 = new HashSet(5);
		assertEquals("Created incorrect HashSet", 0, hs2.size());
		try {
			new HashSet(-1);
		} catch (IllegalArgumentException e) {
			return;
		}
		fail(
				"Failed to throw IllegalArgumentException for capacity < 0");
	}

	/**
	 * @tests java.util.HashSet#HashSet(int, float)
	 */
	public void test_ConstructorIF() {
		// Test for method java.util.HashSet(int, float)
		HashSet hs2 = new HashSet(5, (float) 0.5);
		assertEquals("Created incorrect HashSet", 0, hs2.size());
		try {
			new HashSet(0, 0);
		} catch (IllegalArgumentException e) {
			return;
		}
		fail(
				"Failed to throw IllegalArgumentException for initial load factor <= 0");
	}

	/**
	 * @tests java.util.HashSet#HashSet(java.util.Collection)
	 */
	public void test_ConstructorLjava_util_Collection() {
		// Test for method java.util.HashSet(java.util.Collection)
		HashSet hs2 = new HashSet(Arrays.asList(objArray));
		for (int counter = 0; counter < objArray.length; counter++)
			assertTrue("HashSet does not contain correct elements", hs
					.contains(objArray[counter]));
		assertTrue("HashSet created from collection incorrect size",
				hs2.size() == objArray.length);
	}

	/**
	 * @tests java.util.HashSet#add(java.lang.Object)
	 */
	public void test_addLjava_lang_Object() {
		// Test for method boolean java.util.HashSet.add(java.lang.Object)
		int size = hs.size();
		hs.add(new Integer(8));
		assertTrue("Added element already contained by set", hs.size() == size);
		hs.add(new Integer(-9));
		assertTrue("Failed to increment set size after add",
				hs.size() == size + 1);
		assertTrue("Failed to add element to set", hs.contains(new Integer(-9)));
	}

	/**
	 * @tests java.util.HashSet#clear()
	 */
	public void test_clear() {
		// Test for method void java.util.HashSet.clear()
		Set orgSet = (Set) hs.clone();
		hs.clear();
		Iterator i = orgSet.iterator();
		assertEquals("Returned non-zero size after clear", 0, hs.size());
		while (i.hasNext())
			assertTrue("Failed to clear set", !hs.contains(i.next()));
	}

	/**
	 * @tests java.util.HashSet#clone()
	 */
	public void test_clone() {
		// Test for method java.lang.Object java.util.HashSet.clone()
		HashSet hs2 = (HashSet) hs.clone();
		assertTrue("clone returned an equivalent HashSet", hs != hs2);
		assertTrue("clone did not return an equal HashSet", hs.equals(hs2));
	}

	/**
	 * @tests java.util.HashSet#contains(java.lang.Object)
	 */
	public void test_containsLjava_lang_Object() {
		// Test for method boolean java.util.HashSet.contains(java.lang.Object)
		assertTrue("Returned false for valid object", hs.contains(objArray[90]));
		assertTrue("Returned true for invalid Object", !hs
				.contains(new Object()));

		HashSet s = new HashSet();
		s.add(null);
		assertTrue("Cannot handle null", s.contains(null));
	}

	/**
	 * @tests java.util.HashSet#isEmpty()
	 */
	public void test_isEmpty() {
		// Test for method boolean java.util.HashSet.isEmpty()
		assertTrue("Empty set returned false", new HashSet().isEmpty());
		assertTrue("Non-empty set returned true", !hs.isEmpty());
	}

	/**
	 * @tests java.util.HashSet#iterator()
	 */
	public void test_iterator() {
		// Test for method java.util.Iterator java.util.HashSet.iterator()
		Iterator i = hs.iterator();
		int x = 0;
		while (i.hasNext()) {
			assertTrue("Failed to iterate over all elements", hs.contains(i
					.next()));
			++x;
		}
		assertTrue("Returned iteration of incorrect size", hs.size() == x);

		HashSet s = new HashSet();
		s.add(null);
		assertNull("Cannot handle null", s.iterator().next());
	}

	/**
	 * @tests java.util.HashSet#remove(java.lang.Object)
	 */
	public void test_removeLjava_lang_Object() {
		// Test for method boolean java.util.HashSet.remove(java.lang.Object)
		int size = hs.size();
		hs.remove(new Integer(98));
		assertTrue("Failed to remove element", !hs.contains(new Integer(98)));
		assertTrue("Failed to decrement set size", hs.size() == size - 1);

		HashSet s = new HashSet();
		s.add(null);
		assertTrue("Cannot handle null", s.remove(null));
	}

	/**
	 * @tests java.util.HashSet#size()
	 */
	public void test_size() {
		// Test for method int java.util.HashSet.size()
		assertTrue("Returned incorrect size", hs.size() == (objArray.length + 1));
		hs.clear();
		assertEquals("Cleared set returned non-zero size", 0, hs.size());
	}

    /**
     * @tests java.util.AbstractCollection#toString()
     */
    public void test_toString() {
        HashSet s = new HashSet();
        s.add(s);
        String result = s.toString();
        assertTrue("should contain self ref", result.indexOf("(this") > -1);
    }

	/**
	 * @tests java.util.HashSet#SerializationTest
	 */
	public void test_Serialization() throws Exception{
		HashSet<String> hs = new HashSet<String>();
		hs.add("hello");
		hs.add("world");
		SerializationTest.verifySelf(hs, comparator);
        SerializationTest.verifyGolden(this, hs, comparator);
	}

	/**
	 * Sets up the fixture, for example, open a network connection. This method
	 * is called before a test is executed.
	 */
	protected void setUp() {
		hs = new HashSet();
		for (int i = 0; i < objArray.length; i++)
			hs.add(objArray[i]);
		hs.add(null);
	}

	/**
	 * Tears down the fixture, for example, close a network connection. This
	 * method is called after a test is executed.
	 */
	protected void tearDown() {
	}

	private static final SerializationTest.SerializableAssert comparator = new
	                                   SerializationTest.SerializableAssert() {
		public void assertDeserialized(Serializable initial, Serializable deserialized) {
			HashSet<String> initialHs = (HashSet<String>) initial;
			HashSet<String> deseriaHs = (HashSet<String>) deserialized;
			assertEquals("should be equal", initialHs.size(), deseriaHs.size());
			assertEquals("should be equal", initialHs, deseriaHs);
		}

	};
}