/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2007, by Object Refinery Limited and Contributors.
*
* Project Info: http://www.jfree.org/jfreechart/index.html
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* --------------------
* TimeSeriesTests.java
* --------------------
* (C) Copyright 2001-2007, by Object Refinery Limited.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
* Changes
* -------
* 16-Nov-2001 : Version 1 (DG);
* 17-Oct-2002 : Fixed errors reported by Checkstyle (DG);
* 13-Mar-2003 : Added serialization test (DG);
* 15-Oct-2003 : Added test for setMaximumItemCount method (DG);
* 23-Aug-2004 : Added test that highlights a bug where the addOrUpdate()
* method can lead to more than maximumItemCount items in the
* dataset (DG);
* 24-May-2006 : Added new tests (DG);
* 31-Oct-2007 : New hashCode() test (DG);
* 21-Nov-2007 : Added testBug1832432() and testClone2() (DG);
*
*/
package org.jfree.data.time.junit;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInput;
import java.io.ObjectInputStream;
import java.io.ObjectOutput;
import java.io.ObjectOutputStream;
import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
import org.jfree.data.general.SeriesChangeEvent;
import org.jfree.data.general.SeriesChangeListener;
import org.jfree.data.general.SeriesException;
import org.jfree.data.time.Day;
import org.jfree.data.time.FixedMillisecond;
import org.jfree.data.time.Month;
import org.jfree.data.time.RegularTimePeriod;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesDataItem;
import org.jfree.data.time.Year;
import org.jfree.date.MonthConstants;
/**
* A collection of test cases for the {@link TimeSeries} class.
*/
public class TimeSeriesTests extends TestCase implements SeriesChangeListener {
/** A time series. */
private TimeSeries seriesA;
/** A time series. */
private TimeSeries seriesB;
/** A time series. */
private TimeSeries seriesC;
/** A flag that indicates whether or not a change event was fired. */
private boolean gotSeriesChangeEvent = false;
/**
* Returns the tests as a test suite.
*
* @return The test suite.
*/
public static Test suite() {
return new TestSuite(TimeSeriesTests.class);
}
/**
* Constructs a new set of tests.
*
* @param name the name of the tests.
*/
public TimeSeriesTests(String name) {
super(name);
}
/**
* Common test setup.
*/
protected void setUp() {
this.seriesA = new TimeSeries("Series A", Year.class);
try {
this.seriesA.add(new Year(2000), new Integer(102000));
this.seriesA.add(new Year(2001), new Integer(102001));
this.seriesA.add(new Year(2002), new Integer(102002));
this.seriesA.add(new Year(2003), new Integer(102003));
this.seriesA.add(new Year(2004), new Integer(102004));
this.seriesA.add(new Year(2005), new Integer(102005));
}
catch (SeriesException e) {
System.err.println("Problem creating series.");
}
this.seriesB = new TimeSeries("Series B", Year.class);
try {
this.seriesB.add(new Year(2006), new Integer(202006));
this.seriesB.add(new Year(2007), new Integer(202007));
this.seriesB.add(new Year(2008), new Integer(202008));
}
catch (SeriesException e) {
System.err.println("Problem creating series.");
}
this.seriesC = new TimeSeries("Series C", Year.class);
try {
this.seriesC.add(new Year(1999), new Integer(301999));
this.seriesC.add(new Year(2000), new Integer(302000));
this.seriesC.add(new Year(2002), new Integer(302002));
}
catch (SeriesException e) {
System.err.println("Problem creating series.");
}
}
/**
* Sets the flag to indicate that a {@link SeriesChangeEvent} has been
* received.
*
* @param event the event.
*/
public void seriesChanged(SeriesChangeEvent event) {
this.gotSeriesChangeEvent = true;
}
/**
* Check that cloning works.
*/
public void testClone() {
TimeSeries series = new TimeSeries("Test Series");
RegularTimePeriod jan1st2002 = new Day(1, MonthConstants.JANUARY, 2002);
try {
series.add(jan1st2002, new Integer(42));
}
catch (SeriesException e) {
System.err.println("Problem adding to series.");
}
TimeSeries clone = null;
try {
clone = (TimeSeries) series.clone();
clone.setKey("Clone Series");
try {
clone.update(jan1st2002, new Integer(10));
}
catch (SeriesException e) {
e.printStackTrace();
}
}
catch (CloneNotSupportedException e) {
assertTrue(false);
}
int seriesValue = series.getValue(jan1st2002).intValue();
int cloneValue = Integer.MAX_VALUE;
if (clone != null) {
cloneValue = clone.getValue(jan1st2002).intValue();
}
assertEquals(42, seriesValue);
assertEquals(10, cloneValue);
assertEquals("Test Series", series.getKey());
if (clone != null) {
assertEquals("Clone Series", clone.getKey());
}
else {
assertTrue(false);
}
}
/**
* Another test of the clone() method.
*/
public void testClone2() {
TimeSeries s1 = new TimeSeries("S1", Year.class);
s1.add(new Year(2007), 100.0);
s1.add(new Year(2008), null);
s1.add(new Year(2009), 200.0);
TimeSeries s2 = null;
try {
s2 = (TimeSeries) s1.clone();
}
catch (CloneNotSupportedException e) {
e.printStackTrace();
}
assertTrue(s1.equals(s2));
// check independence
s2.addOrUpdate(new Year(2009), 300.0);
assertFalse(s1.equals(s2));
s1.addOrUpdate(new Year(2009), 300.0);
assertTrue(s1.equals(s2));
}
/**
* Add a value to series A for 1999. It should be added at index 0.
*/
public void testAddValue() {
try {
this.seriesA.add(new Year(1999), new Integer(1));
}
catch (SeriesException e) {
System.err.println("Problem adding to series.");
}
int value = this.seriesA.getValue(0).intValue();
assertEquals(1, value);
}
/**
* Tests the retrieval of values.
*/
public void testGetValue() {
Number value1 = this.seriesA.getValue(new Year(1999));
assertNull(value1);
int value2 = this.seriesA.getValue(new Year(2000)).intValue();
assertEquals(102000, value2);
}
/**
* Tests the deletion of values.
*/
public void testDelete() {
this.seriesA.delete(0, 0);
assertEquals(5, this.seriesA.getItemCount());
Number value = this.seriesA.getValue(new Year(2000));
assertNull(value);
}
/**
* Basic tests for the delete() method.
*/
public void testDelete2() {
TimeSeries s1 = new TimeSeries("Series", Year.class);
s1.add(new Year(2000), 13.75);
s1.add(new Year(2001), 11.90);
s1.add(new Year(2002), null);
s1.addChangeListener(this);
this.gotSeriesChangeEvent = false;
s1.delete(new Year(2001));
assertTrue(this.gotSeriesChangeEvent);
assertEquals(2, s1.getItemCount());
assertEquals(null, s1.getValue(new Year(2001)));
// try deleting a time period that doesn't exist...
this.gotSeriesChangeEvent = false;
s1.delete(new Year(2006));
assertFalse(this.gotSeriesChangeEvent);
// try deleting null
try {
s1.delete(null);
fail("Expected IllegalArgumentException.");
}
catch (IllegalArgumentException e) {
// expected
}
}
/**
* Serialize an instance, restore it, and check for equality.
*/
public void testSerialization() {
TimeSeries s1 = new TimeSeries("A test", Year.class);
s1.add(new Year(2000), 13.75);
s1.add(new Year(2001), 11.90);
s1.add(new Year(2002), null);
s1.add(new Year(2005), 19.32);
s1.add(new Year(2007), 16.89);
TimeSeries s2 = null;
try {
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
ObjectOutput out = new ObjectOutputStream(buffer);
out.writeObject(s1);
out.close();
ObjectInput in = new ObjectInputStream(
new ByteArrayInputStream(buffer.toByteArray())
);
s2 = (TimeSeries) in.readObject();
in.close();
}
catch (Exception e) {
System.out.println(e.toString());
}
assertTrue(s1.equals(s2));
}
/**
* Tests the equals method.
*/
public void testEquals() {
TimeSeries s1 = new TimeSeries("Time Series 1");
TimeSeries s2 = new TimeSeries("Time Series 2");
boolean b1 = s1.equals(s2);
assertFalse("b1", b1);
s2.setKey("Time Series 1");
boolean b2 = s1.equals(s2);
assertTrue("b2", b2);
RegularTimePeriod p1 = new Day();
RegularTimePeriod p2 = p1.next();
s1.add(p1, 100.0);
s1.add(p2, 200.0);
boolean b3 = s1.equals(s2);
assertFalse("b3", b3);
s2.add(p1, 100.0);
s2.add(p2, 200.0);
boolean b4 = s1.equals(s2);
assertTrue("b4", b4);
s1.setMaximumItemCount(100);
boolean b5 = s1.equals(s2);
assertFalse("b5", b5);
s2.setMaximumItemCount(100);
boolean b6 = s1.equals(s2);
assertTrue("b6", b6);
s1.setMaximumItemAge(100);
boolean b7 = s1.equals(s2);
assertFalse("b7", b7);
s2.setMaximumItemAge(100);
boolean b8 = s1.equals(s2);
assertTrue("b8", b8);
}
/**
* Tests a specific bug report where null arguments in the constructor
* cause the equals() method to fail. Fixed for 0.9.21.
*/
public void testEquals2() {
TimeSeries s1 = new TimeSeries("Series", null, null, Day.class);
TimeSeries s2 = new TimeSeries("Series", null, null, Day.class);
assertTrue(s1.equals(s2));
}
/**
* Some tests to ensure that the createCopy(RegularTimePeriod,
* RegularTimePeriod) method is functioning correctly.
*/
public void testCreateCopy1() {
TimeSeries series = new TimeSeries("Series", Month.class);
series.add(new Month(MonthConstants.JANUARY, 2003), 45.0);
series.add(new Month(MonthConstants.FEBRUARY, 2003), 55.0);
series.add(new Month(MonthConstants.JUNE, 2003), 35.0);
series.add(new Month(MonthConstants.NOVEMBER, 2003), 85.0);
series.add(new Month(MonthConstants.DECEMBER, 2003), 75.0);
try {
// copy a range before the start of the series data...
TimeSeries result1 = series.createCopy(
new Month(MonthConstants.NOVEMBER, 2002),
new Month(MonthConstants.DECEMBER, 2002));
assertEquals(0, result1.getItemCount());
// copy a range that includes only the first item in the series...
TimeSeries result2 = series.createCopy(
new Month(MonthConstants.NOVEMBER, 2002),
new Month(MonthConstants.JANUARY, 2003));
assertEquals(1, result2.getItemCount());
// copy a range that begins before and ends in the middle of the
// series...
TimeSeries result3 = series.createCopy(
new Month(MonthConstants.NOVEMBER, 2002),
new Month(MonthConstants.APRIL, 2003));
assertEquals(2, result3.getItemCount());
TimeSeries result4 = series.createCopy(
new Month(MonthConstants.NOVEMBER, 2002),
new Month(MonthConstants.DECEMBER, 2003));
assertEquals(5, result4.getItemCount());
TimeSeries result5 = series.createCopy(
new Month(MonthConstants.NOVEMBER, 2002),
new Month(MonthConstants.MARCH, 2004));
assertEquals(5, result5.getItemCount());
TimeSeries result6 = series.createCopy(
new Month(MonthConstants.JANUARY, 2003),
new Month(MonthConstants.JANUARY, 2003));
assertEquals(1, result6.getItemCount());
TimeSeries result7 = series.createCopy(
new Month(MonthConstants.JANUARY, 2003),
new Month(MonthConstants.APRIL, 2003));
assertEquals(2, result7.getItemCount());
TimeSeries result8 = series.createCopy(
new Month(MonthConstants.JANUARY, 2003),
new Month(MonthConstants.DECEMBER, 2003));
assertEquals(5, result8.getItemCount());
TimeSeries result9 = series.createCopy(
new Month(MonthConstants.JANUARY, 2003),
new Month(MonthConstants.MARCH, 2004));
assertEquals(5, result9.getItemCount());
TimeSeries result10 = series.createCopy(
new Month(MonthConstants.MAY, 2003),
new Month(MonthConstants.DECEMBER, 2003));
assertEquals(3, result10.getItemCount());
TimeSeries result11 = series.createCopy(
new Month(MonthConstants.MAY, 2003),
new Month(MonthConstants.MARCH, 2004));
assertEquals(3, result11.getItemCount());
TimeSeries result12 = series.createCopy(
new Month(MonthConstants.DECEMBER, 2003),
new Month(MonthConstants.DECEMBER, 2003));
assertEquals(1, result12.getItemCount());
TimeSeries result13 = series.createCopy(
new Month(MonthConstants.DECEMBER, 2003),
new Month(MonthConstants.MARCH, 2004));
assertEquals(1, result13.getItemCount());
TimeSeries result14 = series.createCopy(
new Month(MonthConstants.JANUARY, 2004),
new Month(MonthConstants.MARCH, 2004));
assertEquals(0, result14.getItemCount());
}
catch (CloneNotSupportedException e) {
assertTrue(false);
}
}
/**
* Some tests to ensure that the createCopy(int, int) method is
* functioning correctly.
*/
public void testCreateCopy2() {
TimeSeries series = new TimeSeries("Series", Month.class);
series.add(new Month(MonthConstants.JANUARY, 2003), 45.0);
series.add(new Month(MonthConstants.FEBRUARY, 2003), 55.0);
series.add(new Month(MonthConstants.JUNE, 2003), 35.0);
series.add(new Month(MonthConstants.NOVEMBER, 2003), 85.0);
series.add(new Month(MonthConstants.DECEMBER, 2003), 75.0);
try {
// copy just the first item...
TimeSeries result1 = series.createCopy(0, 0);
assertEquals(new Month(1, 2003), result1.getTimePeriod(0));
// copy the first two items...
result1 = series.createCopy(0, 1);
assertEquals(new Month(2, 2003), result1.getTimePeriod(1));
// copy the middle three items...
result1 = series.createCopy(1, 3);
assertEquals(new Month(2, 2003), result1.getTimePeriod(0));
assertEquals(new Month(11, 2003), result1.getTimePeriod(2));
// copy the last two items...
result1 = series.createCopy(3, 4);
assertEquals(new Month(11, 2003), result1.getTimePeriod(0));
assertEquals(new Month(12, 2003), result1.getTimePeriod(1));
// copy the last item...
result1 = series.createCopy(4, 4);
assertEquals(new Month(12, 2003), result1.getTimePeriod(0));
}
catch (CloneNotSupportedException e) {
assertTrue(false);
}
// check negative first argument
boolean pass = false;
try {
/* TimeSeries result = */ series.createCopy(-1, 1);
}
catch (IllegalArgumentException e) {
pass = true;
}
catch (CloneNotSupportedException e) {
pass = false;
}
assertTrue(pass);
// check second argument less than first argument
pass = false;
try {
/* TimeSeries result = */ series.createCopy(1, 0);
}
catch (IllegalArgumentException e) {
pass = true;
}
catch (CloneNotSupportedException e) {
pass = false;
}
assertTrue(pass);
TimeSeries series2 = new TimeSeries("Series 2");
try {
TimeSeries series3 = series2.createCopy(99, 999);
assertEquals(0, series3.getItemCount());
}
catch (CloneNotSupportedException e) {
assertTrue(false);
}
}
/**
* Test the setMaximumItemCount() method to ensure that it removes items
* from the series if necessary.
*/
public void testSetMaximumItemCount() {
TimeSeries s1 = new TimeSeries("S1", Year.class);
s1.add(new Year(2000), 13.75);
s1.add(new Year(2001), 11.90);
s1.add(new Year(2002), null);
s1.add(new Year(2005), 19.32);
s1.add(new Year(2007), 16.89);
assertTrue(s1.getItemCount() == 5);
s1.setMaximumItemCount(3);
assertTrue(s1.getItemCount() == 3);
TimeSeriesDataItem item = s1.getDataItem(0);
assertTrue(item.getPeriod().equals(new Year(2002)));
}
/**
* Some checks for the addOrUpdate() method.
*/
public void testAddOrUpdate() {
TimeSeries s1 = new TimeSeries("S1", Year.class);
s1.setMaximumItemCount(2);
s1.addOrUpdate(new Year(2000), 100.0);
assertEquals(1, s1.getItemCount());
s1.addOrUpdate(new Year(2001), 101.0);
assertEquals(2, s1.getItemCount());
s1.addOrUpdate(new Year(2001), 102.0);
assertEquals(2, s1.getItemCount());
s1.addOrUpdate(new Year(2002), 103.0);
assertEquals(2, s1.getItemCount());
}
/**
* A test for the bug report 1075255.
*/
public void testBug1075255() {
TimeSeries ts = new TimeSeries("dummy", FixedMillisecond.class);
ts.add(new FixedMillisecond(0L), 0.0);
TimeSeries ts2 = new TimeSeries("dummy2", FixedMillisecond.class);
ts2.add(new FixedMillisecond(0L), 1.0);
try {
ts.addAndOrUpdate(ts2);
}
catch (Exception e) {
e.printStackTrace();
assertTrue(false);
}
assertEquals(1, ts.getItemCount());
}
/**
* A test for bug 1832432.
*/
public void testBug1832432() {
TimeSeries s1 = new TimeSeries("Series");
TimeSeries s2 = null;
try {
s2 = (TimeSeries) s1.clone();
}
catch (CloneNotSupportedException e) {
e.printStackTrace();
}
assertTrue(s1 != s2);
assertTrue(s1.getClass() == s2.getClass());
assertTrue(s1.equals(s2));
// test independence
s1.add(new Day(1, 1, 2007), 100.0);
assertFalse(s1.equals(s2));
}
/**
* Some checks for the getIndex() method.
*/
public void testGetIndex() {
TimeSeries series = new TimeSeries("Series", Month.class);
assertEquals(-1, series.getIndex(new Month(1, 2003)));
series.add(new Month(1, 2003), 45.0);
assertEquals(0, series.getIndex(new Month(1, 2003)));
assertEquals(-1, series.getIndex(new Month(12, 2002)));
assertEquals(-2, series.getIndex(new Month(2, 2003)));
series.add(new Month(3, 2003), 55.0);
assertEquals(-1, series.getIndex(new Month(12, 2002)));
assertEquals(0, series.getIndex(new Month(1, 2003)));
assertEquals(-2, series.getIndex(new Month(2, 2003)));
assertEquals(1, series.getIndex(new Month(3, 2003)));
assertEquals(-3, series.getIndex(new Month(4, 2003)));
}
/**
* Some checks for the getDataItem(int) method.
*/
public void testGetDataItem1() {
TimeSeries series = new TimeSeries("S", Year.class);
// can't get anything yet...just an exception
boolean pass = false;
try {
/*TimeSeriesDataItem item =*/ series.getDataItem(0);
}
catch (IndexOutOfBoundsException e) {
pass = true;
}
assertTrue(pass);
series.add(new Year(2006), 100.0);
TimeSeriesDataItem item = series.getDataItem(0);
assertEquals(new Year(2006), item.getPeriod());
pass = false;
try {
/*item = */series.getDataItem(-1);
}
catch (IndexOutOfBoundsException e) {
pass = true;
}
assertTrue(pass);
pass = false;
try {
/*item = */series.getDataItem(1);
}
catch (IndexOutOfBoundsException e) {
pass = true;
}
assertTrue(pass);
}
/**
* Some checks for the getDataItem(RegularTimePeriod) method.
*/
public void testGetDataItem2() {
TimeSeries series = new TimeSeries("S", Year.class);
assertNull(series.getDataItem(new Year(2006)));
// try a null argument
boolean pass = false;
try {
/* TimeSeriesDataItem item = */ series.getDataItem(null);
}
catch (IllegalArgumentException e) {
pass = true;
}
assertTrue(pass);
}
/**
* Some checks for the removeAgedItems() method.
*/
public void testRemoveAgedItems() {
TimeSeries series = new TimeSeries("Test Series", Year.class);
series.addChangeListener(this);
assertEquals(Long.MAX_VALUE, series.getMaximumItemAge());
assertEquals(Integer.MAX_VALUE, series.getMaximumItemCount());
this.gotSeriesChangeEvent = false;
// test empty series
series.removeAgedItems(true);
assertEquals(0, series.getItemCount());
assertFalse(this.gotSeriesChangeEvent);
// test series with one item
series.add(new Year(1999), 1.0);
series.setMaximumItemAge(0);
this.gotSeriesChangeEvent = false;
series.removeAgedItems(true);
assertEquals(1, series.getItemCount());
assertFalse(this.gotSeriesChangeEvent);
// test series with two items
series.setMaximumItemAge(10);
series.add(new Year(2001), 2.0);
this.gotSeriesChangeEvent = false;
series.setMaximumItemAge(2);
assertEquals(2, series.getItemCount());
assertEquals(0, series.getIndex(new Year(1999)));
assertFalse(this.gotSeriesChangeEvent);
series.setMaximumItemAge(1);
assertEquals(1, series.getItemCount());
assertEquals(0, series.getIndex(new Year(2001)));
assertTrue(this.gotSeriesChangeEvent);
}
/**
* Some checks for the removeAgedItems(long, boolean) method.
*/
public void testRemoveAgedItems2() {
long y2006 = 1157087372534L; // milliseconds somewhere in 2006
TimeSeries series = new TimeSeries("Test Series", Year.class);
series.addChangeListener(this);
assertEquals(Long.MAX_VALUE, series.getMaximumItemAge());
assertEquals(Integer.MAX_VALUE, series.getMaximumItemCount());
this.gotSeriesChangeEvent = false;
// test empty series
series.removeAgedItems(y2006, true);
assertEquals(0, series.getItemCount());
assertFalse(this.gotSeriesChangeEvent);
// test a series with 1 item
series.add(new Year(2004), 1.0);
series.setMaximumItemAge(1);
this.gotSeriesChangeEvent = false;
series.removeAgedItems(new Year(2005).getMiddleMillisecond(), true);
assertEquals(1, series.getItemCount());
assertFalse(this.gotSeriesChangeEvent);
series.removeAgedItems(y2006, true);
assertEquals(0, series.getItemCount());
assertTrue(this.gotSeriesChangeEvent);
// test a series with two items
series.setMaximumItemAge(2);
series.add(new Year(2003), 1.0);
series.add(new Year(2005), 2.0);
assertEquals(2, series.getItemCount());
this.gotSeriesChangeEvent = false;
assertEquals(2, series.getItemCount());
series.removeAgedItems(new Year(2005).getMiddleMillisecond(), true);
assertEquals(2, series.getItemCount());
assertFalse(this.gotSeriesChangeEvent);
series.removeAgedItems(y2006, true);
assertEquals(1, series.getItemCount());
assertTrue(this.gotSeriesChangeEvent);
}
/**
* Some simple checks for the hashCode() method.
*/
public void testHashCode() {
TimeSeries s1 = new TimeSeries("Test");
TimeSeries s2 = new TimeSeries("Test");
assertEquals(s1, s2);
assertEquals(s1.hashCode(), s2.hashCode());
s1.add(new Day(1, 1, 2007), 500.0);
s2.add(new Day(1, 1, 2007), 500.0);
assertEquals(s1, s2);
assertEquals(s1.hashCode(), s2.hashCode());
s1.add(new Day(2, 1, 2007), null);
s2.add(new Day(2, 1, 2007), null);
assertEquals(s1, s2);
assertEquals(s1.hashCode(), s2.hashCode());
s1.add(new Day(5, 1, 2007), 111.0);
s2.add(new Day(5, 1, 2007), 111.0);
assertEquals(s1, s2);
assertEquals(s1.hashCode(), s2.hashCode());
s1.add(new Day(9, 1, 2007), 1.0);
s2.add(new Day(9, 1, 2007), 1.0);
assertEquals(s1, s2);
assertEquals(s1.hashCode(), s2.hashCode());
}
}