| /* |
| * 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.cassandra.stress.generate; |
| |
| import org.junit.Test; |
| |
| import org.apache.cassandra.stress.settings.OptionDistribution; |
| |
| import static org.junit.Assert.*; |
| |
| public class DistributionSequenceTest |
| { |
| @Test |
| public void simpleSequence() throws Exception |
| { |
| Distribution dist = OptionDistribution.get("seq(1..10)").get(); |
| assertTrue(dist instanceof DistributionSequence); |
| |
| assertEquals(1, dist.minValue()); |
| assertEquals(10, dist.maxValue()); |
| assertEquals(5, dist.average()); |
| |
| assertEquals(1, dist.inverseCumProb(0d)); |
| assertEquals(10, dist.inverseCumProb(1d)); |
| |
| long min = dist.next(); |
| assertEquals(1,min); |
| |
| long last = min; |
| for (int i=0; i<9; i++) |
| { |
| long next = dist.next(); |
| assertEquals(next, last+1); //increase by one each step |
| last = next; |
| } |
| |
| assertEquals(1, dist.next()); // wrapping |
| } |
| |
| |
| @Test |
| public void negValueSequence() throws Exception |
| { |
| Distribution dist = OptionDistribution.get("seq(-1000..-10)").get(); |
| assertTrue(dist instanceof DistributionSequence); |
| |
| assertEquals(-1000, dist.minValue()); |
| assertEquals( -10, dist.maxValue()); |
| assertEquals(-504, dist.average()); |
| |
| assertEquals(-1000, dist.inverseCumProb(0d)); |
| assertEquals(-10, dist.inverseCumProb(1d)); |
| |
| long min = dist.next(); |
| assertEquals(-1000, min); |
| |
| long last = min; |
| long next = dist.next(); |
| while (last<next) |
| { |
| assertEquals(next, last+1); //increase by one each step |
| last = next; |
| next = dist.next(); |
| } |
| |
| assertEquals(-10, last); // wrapping |
| assertEquals(-1000, next); // wrapping |
| } |
| |
| @Test |
| public void bigSequence() throws Exception |
| { |
| Distribution dist = OptionDistribution.get(String.format("seq(1..%d)", Long.MAX_VALUE)).get(); |
| assertTrue(dist instanceof DistributionSequence); |
| |
| assertEquals(1, dist.minValue()); |
| assertEquals(Long.MAX_VALUE, dist.maxValue()); |
| |
| assertEquals(1, dist.inverseCumProb(0d)); |
| assertEquals(Long.MAX_VALUE, dist.inverseCumProb(1d)); |
| |
| } |
| |
| @Test |
| public void setSeed() throws Exception |
| { |
| Distribution dist = OptionDistribution.get("seq(1..10)").get(); |
| assertTrue(dist instanceof DistributionSequence); |
| |
| for (int seed=1; seed<500; seed+=seed) |
| { |
| dist.setSeed(seed); |
| assertEquals(1, dist.minValue()); |
| assertEquals(10, dist.maxValue()); |
| assertEquals(5, dist.average()); |
| |
| assertEquals(1, dist.inverseCumProb(0d)); |
| assertEquals(10, dist.inverseCumProb(1d)); |
| |
| long last = dist.next(); |
| for (int i = 0; i < 9; i++) |
| { |
| long next = dist.next(); |
| if (next>1) |
| { |
| assertEquals(next, last + 1); //increase by one each step |
| }else{ |
| assertEquals(last, 10); //wrap after the end |
| } |
| last = next; |
| } |
| } |
| } |
| } |