library/src/test/java/com/datatorrent/lib/math/MarginKeyValTest.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 com.datatorrent.lib.testbench.CollectorTestSink;
import com.datatorrent.lib.util.KeyValPair;

/**
 * Functional tests for {@link com.datatorrent.lib.math.MarginKeyVal}.
 */
public class MarginKeyValTest
{
	/**
	 * Test node logic emits correct results.
	 */
	@Test
	public void testNodeProcessing() throws Exception
	{
		testNodeProcessingSchema(new MarginKeyVal<String, Integer>());
		testNodeProcessingSchema(new MarginKeyVal<String, Double>());
		testNodeProcessingSchema(new MarginKeyVal<String, Float>());
		testNodeProcessingSchema(new MarginKeyVal<String, Short>());
		testNodeProcessingSchema(new MarginKeyVal<String, Long>());
	}

	@SuppressWarnings({ "unchecked", "rawtypes" })
	public void testNodeProcessingSchema(MarginKeyVal oper)
	{
		CollectorTestSink marginSink = new CollectorTestSink();

		oper.margin.setSink(marginSink);

		oper.beginWindow(0);
		oper.numerator.process(new KeyValPair("a", 2));
		oper.numerator.process(new KeyValPair("b", 20));
		oper.numerator.process(new KeyValPair("c", 1000));

		oper.denominator.process(new KeyValPair("a", 2));
		oper.denominator.process(new KeyValPair("b", 40));
		oper.denominator.process(new KeyValPair("c", 500));
		oper.endWindow();

		Assert.assertEquals("number emitted tuples", 3,
				marginSink.collectedTuples.size());
		for (int i = 0; i < marginSink.collectedTuples.size(); i++) {
			if ("a".equals(((KeyValPair<String, Number>) marginSink.collectedTuples
					.get(i)).getKey())) {
				Assert.assertEquals("emitted value for 'a' was ", new Double(0),
						((KeyValPair<String, Number>) marginSink.collectedTuples.get(i))
								.getValue().doubleValue(), 0);
			}
			if ("b".equals(((KeyValPair<String, Number>) marginSink.collectedTuples
					.get(i)).getKey())) {
				Assert.assertEquals("emitted value for 'b' was ", new Double(0.5),
						((KeyValPair<String, Number>) marginSink.collectedTuples.get(i))
								.getValue().doubleValue(), 0);
			}
			if ("c".equals(((KeyValPair<String, Number>) marginSink.collectedTuples
					.get(i)).getKey())) {
				Assert.assertEquals("emitted value for 'c' was ", new Double(-1),
						((KeyValPair<String, Number>) marginSink.collectedTuples.get(i))
								.getValue().doubleValue(), 0);
			}
		}
	}
}