我想我搞砸了。我在JUnit测试类中有这个代码:
import static org.junit.Assert.*;
import java.util.ArrayList;
import org.junit.After;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
public class HangmanLogicTest {
ArrayList<Integer> negIntList = new ArrayList<Integer>();
ArrayList<Integer> intList = new ArrayList<Integer>();
HangmanLogic hl = new HangmanLogic();
String booty = "b----";
// creates a list of integers from 1 to 10000
private void makePosInts()
{
int min = 1;
int max = 10000;
for (int i = min; i <= max; i++) {
intList.add(i);
}
}
// testing the constructor to see if it will accept valid strings
@Test
public void testString_HangmanLogic() throws InvalidConfigurationException {
for (String i : FileReader.validWords) { // FileReader.validWords is a list of all valid words
HangmanLogic h = new HangmanLogic(i, 1);
}
}
// testing the constructor to see if it will accept valid integers
@Test
public void testInt_HangmanLogic() throws InvalidConfigurationException {
for (int i : intList) {
HangmanLogic h = new HangmanLogic("booty", i);
}
}
// testing the constructor to see if it will throw exception for null string parameter
@Test(expected = InvalidConfigurationException.class)
public void testNullStringException_HangmanLogic() throws InvalidConfigurationException {
HangmanLogic h = new HangmanLogic(nullString, 1);
}
// testing the constructor to see if it will throw exception for empty string parameter
@Test(expected = InvalidConfigurationException.class)
public void testEmptyStringException_HangmanLogic() throws InvalidConfigurationException {
HangmanLogic h = new HangmanLogic("", 1);
}
// testing the constructor to see if it will throw an exception for 0 in the int parameter
@Test(expected = InvalidConfigurationException.class)
public void test0Exception_HangmanLogic() throws InvalidConfigurationException {
HangmanLogic h = new HangmanLogic("booty", 0);
}
// testing the constructor to see if it will throw an exception for negative integer parameters
@Test(expected = InvalidConfigurationException.class)
public void testNegIntException_HangmanLogic() throws InvalidConfigurationException {
HangmanLogic h = new HangmanLogic("booty", (-1));
}
// testing getKnownKeyPhrase() to see if the if conditional works at HangmanLogic line 55
@Test
public void testIf_getKnownKeyPhrase() throws InvalidConfigurationException{
hl.keyPhrase = "booty";
HangmanLogic.guessedCharacters.add('b');
assertTrue(hl.getKnownKeyPhrase().equals("b----"));
}
// testing
}
方法getKnownKeyPhrase()是以下代码:
public String getKnownKeyPhrase()
{
char[] encodedKeyPhrase = new char[keyPhrase.length()];
String lowerCaseKeyPhrase = keyPhrase.toLowerCase();
for(int i = 0; i < keyPhrase.length(); i++)
{
char cur = lowerCaseKeyPhrase.charAt(i);
if(guessedCharacters.contains(cur))
encodedKeyPhrase[i] = cur;
else
encodedKeyPhrase[i] = '-';
}
return (new String(encodedKeyPhrase) );
}
其中encodedKeyPhrase是一个char数组,看起来像这样{b, - , - , - , - }
这是错误跟踪:
java.lang.NullPointerException
at HangmanLogicTest.testIf_getKnownKeyPhrase(HangmanLogicTest.java:87)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
我一直收到空指针错误。
我做错了什么?
谢谢!