新手求助，junit問題，請高手指點

javaGhost發表於2007-08-27
我照著例子練習使用junit,有個問題不只怎麼回事，請高手指點
-------Money.java程式碼
public class Money{
private int fAmount;
private String fCurrency;

public Money(int amount, String currency){
fAmount = amount;
fCurrency = currency;
}

public int getAmount(){
return fAmount;
}

public String getCurrency(){
return fCurrency;
}

public boolean equals(Object anObject){
if(anObject instanceof Money){
Money aMoney = (Money)anObject;
return aMoney.getCurrency().equals(getCurrency()) && getAmount() == aMoney.getAmount();
}
return false;
}

public String toString(){
return String.valueOf(getAmount()) + "-" + getCurrency();
}
};

------MoneyBusiness.java 程式碼
public class MoneyBusiness{
public static Money add(Money m1,Money m2){
return new Money(m1.getAmount()+m2.getAmount(),m1.getCurrency());
}

public static Money add(int m1,int m2){
return new Money(m1+m2,"CHF");
}

public static void main(String[] args){
Money m12CHF = new Money(12,"CHF");
Money m14CHF = new Money(14,"CHF");

Money m = add(m12CHF,m14CHF);

System.out.println("add result: " + m.toString());
}
}

------MoneyBusinessTest.java程式碼
import junit.framework.TestCase;
import junit.framework.Assert;

public class MoneyBusinessTest extends TestCase {
private Money m12CHF;
private Money m14CHF;

protected void setUP(){
m12CHF = new Money(12,"CHF");
m14CHF = new Money(14,"CHF");
}

public void testAdd(){
Money expected = new Money(26,"CHF");
//Money result = new Money(26,"CHF");
Money result = MoneyBusiness.add(m12CHF,m14CHF);
Assert.assertTrue("***should be ture***",expected.equals(result));
}
}
--------------
執行MoneyBusiness.main方法沒問題
可用junit測試通不過,顯示:
java.lang.NullPointerException
at MoneyBusiness.add(MoneyBusiness.java:6)
at MoneyBusinessTest.testAdd(MoneyBusinessTest.java:16)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at junit.framework.TestCase.runTest(TestCase.java:168)
at junit.framework.TestCase.runBare(TestCase.java:134)
at junit.framework.TestResult$1.protect(TestResult.java:110)
at junit.framework.TestResult.runProtected(TestResult.java:128)
at junit.framework.TestResult.run(TestResult.java:113)
at junit.framework.TestCase.run(TestCase.java:124)
at junit.framework.TestSuite.runTest(TestSuite.java:232)
at junit.framework.TestSuite.run(TestSuite.java:227)
at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)

請高手指點,不甚感激

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