类似于:
private static final Logger log = Logger.getLogger(Clazz.class.getName());
....
if (file == null || !file.exists()) {
// if File not found
log.warn("File not found: "+file.toString());
} else if (!file.canWrite()) {
// if file is read only
log.warn("File is read-only: "+file.toString());
} else {
// all checks passed, can return an working file.
return file;
}
return null;
我希望使用JUnit进行测试,以确保在所有情况下(例如文件未找到、文件只读)都会发出警告并返回null。
有什么想法吗?
谢谢,阿萨夫:-)
更新
Aaron答案的实现(加上Peter的备注):
public class UnitTest {
...
@BeforeClass
public static void setUpOnce() {
appenders = new Vector<Appender>(2);
// 1. just a printout appender:
appenders.add(new ConsoleAppender(new PatternLayout("%d [%t] %-5p %c - %m%n")));
// 2. the appender to test against:
writer = new StringWriter();
appenders.add(new WriterAppender(new PatternLayout("%p, %m%n"),writer));
}
@Before
public void setUp() {
// Unit Under Test:
unit = new TestUnit();
// setting test appenders:
for (Appender appender : appenders) {
TestUnit.log.addAppender(appender);
}
// saving additivity and turning it off:
additivity = TestUnit.log.getAdditivity();
TestUnit.log.setAdditivity(false);
}
@After
public void tearDown() {
unit = null;
for (Appender appender : appenders) {
TestUnit.log.removeAppender(appender);
}
TestUnit.log.setAdditivity(additivity);
}
@Test
public void testGetFile() {
// start fresh:
File file;
writer.getBuffer().setLength(0);
// 1. test null file:
System.out.println(" 1. test null file.");
file = unit.getFile(null);
assertNull(file);
assertTrue(writer.toString(), writer.toString().startsWith("WARN, File not found"));
writer.getBuffer().setLength(0);
// 2. test empty file:
System.out.println(" 2. test empty file.");
file = unit.getFile("");
assertNull(file);
assertTrue(writer.toString(), writer.toString().startsWith("WARN, File not found"));
writer.getBuffer().setLength(0);
}
感谢大家,
谢谢。
file == null
为真,则log.warn中的file.toString()
将会抛出异常。 - Bert F