/*
 * 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.stat.descriptive.moment.Mean;

/**
 * Tests for AbstractUnivariateStatistic
 *
 * @version $Revision$ $Date$
 */
public class AbstractUnivariateStatisticTest extends TestCase {

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

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

	protected double[] testArray = { 0, 1, 2, 3, 4, 5 };
	protected double[] nullArray = null;
	protected double[] singletonArray = { 0 };
	protected Mean testStatistic = new Mean();

	public void testTestPositive() {
		for (int j = 0; j < 6; j++) {
			for (int i = 1; i < (7 - j); i++) {
				assertTrue(testStatistic.test(testArray, 0, i));
			}
		}
		assertTrue(testStatistic.test(singletonArray, 0, 1));
	}

	public void testTestNegative() {
		assertFalse(testStatistic.test(singletonArray, 0, 0));
		assertFalse(testStatistic.test(testArray, 0, 0));
		try {
			testStatistic.test(singletonArray, 2, 1); // start past end
			fail("Expecting IllegalArgumentException");
		} catch (IllegalArgumentException ex) {
			// expected
		}
		try {
			testStatistic.test(testArray, 0, 7); // end past end
			fail("Expecting IllegalArgumentException");
		} catch (IllegalArgumentException ex) {
			// expected
		}
		try {
			testStatistic.test(testArray, -1, 1); // start negative
			fail("Expecting IllegalArgumentException");
		} catch (IllegalArgumentException ex) {
			// expected
		}
		try {
			testStatistic.test(testArray, 0, -1); // length negative
			fail("Expecting IllegalArgumentException");
		} catch (IllegalArgumentException ex) {
			// expected
		}
		try {
			testStatistic.test(nullArray, 0, 1); // null array
			fail("Expecting IllegalArgumentException");
		} catch (IllegalArgumentException ex) {
			// expected
		}
	}
}
