library/src/test/java/com/datatorrent/lib/math/ChangeTest.java

/*
 * Copyright (c) 2013 DataTorrent, Inc. ALL Rights Reserved.
 *
 * Licensed 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 com.datatorrent.lib.math;

import org.junit.Assert;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.datatorrent.lib.testbench.CollectorTestSink;

/**
 *
 * Functional tests for {@link com.datatorrent.lib.math.Change}.
 * <p>
 *
 */
public class ChangeTest
{
	private static Logger log = LoggerFactory.getLogger(ChangeTest.class);

	/**
	 * Test node logic emits correct results.
	 */
	@Test
	public void testNodeProcessing() throws Exception
	{
		testNodeProcessingSchema(new Change<Integer>());
		testNodeProcessingSchema(new Change<Double>());
		testNodeProcessingSchema(new Change<Float>());
		testNodeProcessingSchema(new Change<Short>());
		testNodeProcessingSchema(new Change<Long>());
	}

	/**
	 *
	 * @param oper  Data value for comparison.
	 */
	@SuppressWarnings({ "rawtypes", "unchecked" })
  public <V extends Number> void testNodeProcessingSchema(Change<V> oper)
	{
		CollectorTestSink changeSink = new CollectorTestSink();
		CollectorTestSink percentSink = new CollectorTestSink();

		oper.change.setSink(changeSink);
		oper.percent.setSink(percentSink);

		oper.beginWindow(0);
		oper.base.process(oper.getValue(10));
		oper.data.process(oper.getValue(5));
		oper.data.process(oper.getValue(15));
		oper.data.process(oper.getValue(20));
		oper.endWindow();

		Assert.assertEquals("number emitted tuples", 3,
				changeSink.collectedTuples.size());
		Assert.assertEquals("number emitted tuples", 3,
				percentSink.collectedTuples.size());

		log.debug("\nLogging tuples");
		for (Object o : changeSink.collectedTuples) {
			log.debug(String.format("change %s", o));
		}
		for (Object o : percentSink.collectedTuples) {
			log.debug(String.format("percent change %s", o));
		}
	}
}