/*
 * 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.commons.math.stat.descriptive;

import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;

import org.apache.commons.math.TestUtils;

/**
 * Test cases for the {@link StatisticalSummaryValues} class.
 *
 * @version $Revision$ $Date$
 */

public final class StatisticalSummaryValuesTest extends TestCase {

	public StatisticalSummaryValuesTest(String name) {
		super(name);
	}

	public static Test suite() {
		TestSuite suite = new TestSuite(StatisticalSummaryValuesTest.class);
		suite.setName("StatisticalSummaryValues Tests");
		return suite;
	}

	public void testSerialization() {
		StatisticalSummaryValues u = new StatisticalSummaryValues(1, 2, 3, 4, 5, 6);
		TestUtils.checkSerializedEquality(u);
		StatisticalSummaryValues t = (StatisticalSummaryValues) TestUtils.serializeAndRecover(u);
		verifyEquality(u, t);
	}

	public void testEqualsAndHashCode() {
		StatisticalSummaryValues u = new StatisticalSummaryValues(1, 2, 3, 4, 5, 6);
		StatisticalSummaryValues t = null;
		assertTrue("reflexive", u.equals(u));
		assertFalse("non-null compared to null", u.equals(t));
		assertFalse("wrong type", u.equals(Double.valueOf(0)));
		t = new StatisticalSummaryValues(1, 2, 3, 4, 5, 6);
		assertTrue("instances with same data should be equal", t.equals(u));
		assertEquals("hash code", u.hashCode(), t.hashCode());

		u = new StatisticalSummaryValues(Double.NaN, 2, 3, 4, 5, 6);
		t = new StatisticalSummaryValues(1, Double.NaN, 3, 4, 5, 6);
		assertFalse("instances based on different data should be different", (u.equals(t) || t.equals(u)));
	}

	private void verifyEquality(StatisticalSummaryValues s, StatisticalSummaryValues u) {
		assertEquals("N", s.getN(), u.getN());
		TestUtils.assertEquals("sum", s.getSum(), u.getSum(), 0);
		TestUtils.assertEquals("var", s.getVariance(), u.getVariance(), 0);
		TestUtils.assertEquals("std", s.getStandardDeviation(), u.getStandardDeviation(), 0);
		TestUtils.assertEquals("mean", s.getMean(), u.getMean(), 0);
		TestUtils.assertEquals("min", s.getMin(), u.getMin(), 0);
		TestUtils.assertEquals("max", s.getMax(), u.getMax(), 0);
	}
}
