content: /**
   * 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.bigtop.datagenerators.bigpetstore.generators.transaction;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  
  import org.apache.bigtop.datagenerators.bigpetstore.generators.transaction.ProductCategoryUsageSimulator;
  import org.apache.bigtop.datagenerators.bigpetstore.generators.transaction.ProductCategoryUsageTrajectory;
  import org.apache.bigtop.datagenerators.samplers.SeedFactory;
  import org.apache.commons.lang3.tuple.Pair;
  import org.junit.Test;
  
  public class TestProductCategoryUsageSimulator
  {
  
  	@Test
  	public void testSimulate() throws Exception
  	{
  		SeedFactory seedFactory = new SeedFactory(1234);
  
  		ProductCategoryUsageSimulator simulator = new ProductCategoryUsageSimulator(2.0, 1.0, 1.0, seedFactory);
  
  		ProductCategoryUsageTrajectory trajectory = simulator.simulate(0.0, 30.0);
  
  		assertEquals(0.0, trajectory.getLastAmount(), 0.0001);
  
  		Pair<Double, Double> previousEntry = trajectory.getStep(0);
  		for(int i = 1; i < trajectory.size(); i++)
  		{
  			Pair<Double, Double> entry = trajectory.getStep(i);
  			// time should move forward
  			assertTrue(previousEntry.getLeft() <= entry.getLeft());
  			// remaining amounts should go down
  			assertTrue(previousEntry.getRight() >= entry.getRight());
  			previousEntry = entry;
  		}
  	}
  
  }
  