flink-core/src/test/java/org/apache/flink/api/common/accumulators/DoubleMaximumTest.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.flink.api.common.accumulators;

import org.junit.Test;

import static org.junit.Assert.assertEquals;

public class DoubleMaximumTest {

	@Test
	public void testGet() {
		DoubleMaximum max = new DoubleMaximum();
		assertEquals(Double.NEGATIVE_INFINITY, max.getLocalValue(), 0.0);
	}

	@Test
	public void testResetLocal() {
		DoubleMaximum max = new DoubleMaximum();
		double value = 13.57902468;

		max.add(value);
		assertEquals(value, max.getLocalValue(), 0.0);

		max.resetLocal();
		assertEquals(Double.NEGATIVE_INFINITY, max.getLocalValue(), 0.0);
	}

	@Test
	public void testAdd() {
		DoubleMaximum max = new DoubleMaximum();

		max.add(1234.5768);
		max.add(9876.5432);
		max.add(-987.6543);
		max.add(-123.4567);

		assertEquals(9876.5432, max.getLocalValue(), 0.0);
	}

	@Test
	public void testMerge() {
		DoubleMaximum max1 = new DoubleMaximum();
		max1.add(1234.5768);

		DoubleMaximum max2 = new DoubleMaximum();
		max2.add(5678.9012);

		max2.merge(max1);
		assertEquals(5678.9012, max2.getLocalValue(), 0.0);

		max1.merge(max2);
		assertEquals(5678.9012, max1.getLocalValue(), 0.0);
	}

	@Test
	public void testClone() {
		DoubleMaximum max = new DoubleMaximum();
		double value = 3.14159265359;

		max.add(value);

		DoubleMaximum clone = max.clone();
		assertEquals(value, clone.getLocalValue(), 0.0);
	}
}