NextDay是一个简单的日期计算器,计算给定日期的下一天的具体日期。如给定2020年1月1日,返回2020年1月2日;给定2020年1月31日,返回2020年2月1日。主要要求考察学生对日期边界以及异常处理的测试的能力。
实现NextdayTest.java
package net.test;
import static org.junit.Assert.*;
import static org.junit.matchers.JUnitMatchers.containsString;
import net.mooctest.*;
import org.junit.Assert;
import org.junit.Test;
import org.junit.rules.ExpectedException;
public class NextdayTest {
// 有效
@Test
public void testDate01() {
Date date = new Date(2,29,2016);
Date d = Nextday.nextDay(date);
String result = d.toString();
Assert.assertEquals("3/1/2016",result);
}
// 抛出异常
@Test
public void testDate02(){
try{
Date date = new Date(-1,1,1901);
Date d = Nextday.nextDay(date);
}catch (IllegalArgumentException e){
assertThat(e.getMessage(), containsString("Not a valid month"));
}
}
// 以此类推
}
测试程序内容
Year.java
package net.mooctest;
public class Year extends CalendarUnit {
public Year(int pYear) {
setYear(pYear);
}
public void setYear(int pYear) {
setCurrentPos(pYear);
if (!this.isValid()) {
throw new IllegalArgumentException("Not a valid month");
}
}
public int getYear() {
return currentPos;
}
public boolean increment() {
currentPos = currentPos + 1;
if (currentPos == 0)
currentPos = 1;
return true;
}
public boolean isLeap() {
if (currentPos >= 0
&& (((currentPos % 4 == 0) && (currentPos % 100 != 0)) || (currentPos % 400 == 0)))
return true;
else if (currentPos < 0
&& ((((currentPos * -1) % 4 == 1) && ((currentPos * -1) % 100 != 1)) || ((currentPos * -1) % 400 == 1)))
return true;
return false;
}
protected boolean isValid() {
if (this.currentPos != 0)
return true;
return false;
}
public boolean equals(Object o) {
if (o instanceof Year) {
if (this.currentPos == ((Year) o).currentPos)
return true;
}
return false;
}
}
Month.java
package net.mooctest;
public class Month extends CalendarUnit {
private Year y;
private int[] sizeIndex = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
public Month(int pMonth, Year y) {
setMonth(pMonth, y);
}
public void setMonth(int pMonth, Year y) {
setCurrentPos(pMonth);
this.y = y;
if (!this.isValid()) {
throw new IllegalArgumentException("Not a valid month");
}
}
public int getMonth() {
return currentPos;
}
public int getMonthSize() {
if (y.isLeap())
sizeIndex[1] = 29;
else
sizeIndex[1] = 28;
return sizeIndex[currentPos - 1];
}
public boolean increment() {
currentPos += 1;
if (currentPos > 12)
return false;
else
return true;
}
public boolean isValid() {
if (y != null && y.isValid())
if (this.currentPos >= 1 && this.currentPos <= 12)
return true;
return false;
}
public boolean equals(Object o) {
if (o instanceof Month) {
if (this.currentPos == ((Month) o).currentPos
&& this.y.equals(((Month) o).y))
return true;
}
return false;
}
}
Day.java
package net.mooctest;
public class Day extends CalendarUnit {
private Month m;
public Day(int pDay, Month m) {
setDay(pDay, m);
}
public boolean increment() {
currentPos += 1;
if (currentPos = 1 && this.currentPos <= m.getMonthSize())
return true;
return false;
}
public boolean equals(Object o) {
if (o instanceof Day) {
if (this.currentPos == ((Day) o).currentPos
&& this.m.equals(((Day) o).m))
return true;
}
return false;
}
}
Date.java
package net.mooctest;
public class Date {
private Day d;
private Month m;
private Year y;
public Date(int pMonth, int pDay, int pYear) {
y = new Year(pYear);
m = new Month(pMonth, y);
d = new Day(pDay, m);
}
public void increment() {
if (!d.increment()) {
if (!m.increment()) {
y.increment();
m.setMonth(1, y);
}
d.setDay(1, m);
}
}
public void printDate() {
System.out.println(m.getMonth() + "/" + d.getDay() + "/" + y.getYear());
}
public Day getDay() {
return d;
}
public Month getMonth() {
return m;
}
public Year getYear() {
return y;
}
public boolean equals(Object o) {
if (o instanceof Date) {
if (this.y.equals(((Date) o).y) && this.m.equals(((Date) o).m)
&& this.d.equals(((Date) o).d))
return true;
}
return false;
}
public String toString() {
return (m.getMonth() + "/" + d.getDay() + "/" + y.getYear());
}
}
Nextday.java
package net.mooctest;
public class Nextday {
public static Date nextDay(Date d) {
Date dd = new Date(d.getMonth().getCurrentPos(), d.getDay().getCurrentPos(), d.getYear().getCurrentPos());
dd.increment();
return dd;
}
}
CalendarUnit.java
package net.mooctest;
public abstract class CalendarUnit {
protected int currentPos;
protected void setCurrentPos(int pCurrentPos) {
currentPos = pCurrentPos;
}
protected int getCurrentPos() {
return currentPos;
}
protected abstract boolean increment();
protected abstract boolean isValid();
}
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