/*
* Copyright 2013 - 2014 Felix Müller
*
* This file is part of CodeQ Invest.
*
* CodeQ Invest is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* CodeQ Invest is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with CodeQ Invest. If not, see <http://www.gnu.org/licenses/>.
*/
package org.codeqinvest.codechanges;
import org.codeqinvest.codechanges.scm.CodeChurnCalculationException;
import org.codeqinvest.codechanges.scm.DailyCodeChurn;
import org.codeqinvest.codechanges.scm.ScmConnectionEncodingException;
import org.fest.assertions.Delta;
import org.joda.time.LocalDate;
import org.junit.Before;
import org.junit.Test;
import java.util.Arrays;
import static org.fest.assertions.Assertions.assertThat;
public class WeightedCodeChangeProbabilityCalculatorTest extends AbstractCodeChangeProbabilityCalculatorTest {
private LocalDate startDay;
@Before
public void setUp() {
startDay = LocalDate.now();
}
@Test
public void codeChurnForOneDayPeriod() throws CodeChurnCalculationException, ScmConnectionEncodingException {
fakeCodeChurnCalculator.addCodeChurn("A", new DailyCodeChurn(startDay, Arrays.asList(0.8)));
// no data for yesterday, so only 'today' values count
CodeChangeProbabilityCalculator codeChangeProbabilityCalculator = new WeightedCodeChangeProbabilityCalculator(codeChurnCalculatorFactory, startDay, 1);
assertThat(codeChangeProbabilityCalculator.calculateCodeChangeProbability(dummyConnectionSettings, "A"))
.isEqualTo(0.6595, Delta.delta(0.0001));
}
@Test
public void codeChurnForFiveDayPeriod() throws CodeChurnCalculationException, ScmConnectionEncodingException {
fakeCodeChurnCalculator.addCodeChurn("A", new DailyCodeChurn(startDay, Arrays.asList(0.8, 0.1)));
fakeCodeChurnCalculator.addCodeChurn("A", new DailyCodeChurn(startDay.minusDays(1), Arrays.asList(0.1)));
fakeCodeChurnCalculator.addCodeChurn("A", new DailyCodeChurn(startDay.minusDays(2), Arrays.asList(0.23)));
fakeCodeChurnCalculator.addCodeChurn("A", new DailyCodeChurn(startDay.minusDays(3), Arrays.asList(0.33, 0.004)));
// on the fourth day nothing happened
fakeCodeChurnCalculator.addCodeChurn("A", new DailyCodeChurn(LocalDate.now().minusDays(5), Arrays.asList(1.0)));
final double expectedSumOfCodeChurnProportions = 0.306796785456 + 0.038349598181547084
+ 0.027051861681
+ 0.042133988029
+ 0.03837934168987 + 0.000465
+ 0.027777;
CodeChangeProbabilityCalculator codeChangeProbabilityCalculator = new WeightedCodeChangeProbabilityCalculator(codeChurnCalculatorFactory, startDay, 5);
assertThat(codeChangeProbabilityCalculator.calculateCodeChangeProbability(dummyConnectionSettings, "A"))
.isEqualTo(expectedSumOfCodeChurnProportions, Delta.delta(0.001));
}
@Test
public void maxPossibleProbabilityShouldBeOne() throws CodeChurnCalculationException, ScmConnectionEncodingException {
fakeCodeChurnCalculator.addCodeChurn("A", new DailyCodeChurn(startDay, Arrays.asList(20.0, 30.0, 40.0)));
fakeCodeChurnCalculator.addCodeChurn("A", new DailyCodeChurn(startDay.minusDays(1), Arrays.asList(20.0, 10.0)));
CodeChangeProbabilityCalculator codeChangeProbabilityCalculator = new WeightedCodeChangeProbabilityCalculator(codeChurnCalculatorFactory, startDay, 1);
assertThat(codeChangeProbabilityCalculator.calculateCodeChangeProbability(dummyConnectionSettings, "A")).isEqualTo(1.0);
}
}