Java JUnit：检查是否调用了 void 方法
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JUnit: checking if a void method gets called
提问by nkr1pt
I have a very simple file watcher class which checks every 2 seconds if a file has changed and if so, the onChangemethod (void) is called.
Is there an easy way to check if the onChangemethod is getting called in a unit test?
我有一个非常简单的文件观察器类，它每 2 秒检查一次文件是否已更改，如果已更改，则onChange调用方法 (void)。有没有一种简单的方法来检查该onChange方法是否在单元测试中被调用？
code:
代码：
public class PropertyFileWatcher extends TimerTask {
private long timeStamp;
private File file;
public PropertyFileWatcher(File file) {
this.file = file;
this.timeStamp = file.lastModified();
}
public final void run() {
long timeStamp = file.lastModified();
if (this.timeStamp != timeStamp) {
this.timeStamp = timeStamp;
onChange(file);
}
}
protected void onChange(File file) {
System.out.println("Property file has changed");
}
}
Test:
测试：
@Test
public void testPropertyFileWatcher() throws Exception {
File file = new File("testfile");
file.createNewFile();
PropertyFileWatcher propertyFileWatcher = new PropertyFileWatcher(file);
Timer timer = new Timer();
timer.schedule(propertyFileWatcher, 2000);
FileWriter fw = new FileWriter(file);
fw.write("blah");
fw.close();
Thread.sleep(8000);
// check if propertyFileWatcher.onChange was called
file.delete();
}
采纳答案by ryanprayogo
回答by doublep
As I understand, your PropertyFileWatcheris meant to be subclassed. So, why not subclass it like this:
据我了解，您PropertyFileWatcher的目的是被子类化。那么，为什么不像这样子类化它：
class TestPropertyFileWatcher extends PropertyFileWatcher
{
boolean called = false;
protected void onChange(File file) {
called = true;
}
}
...
TestPropertyFileWatcher watcher = new TestPropertyFileWatcher
...
assertTrue(watcher.called);
回答by Alexander Pogrebnyak
Here is a simple modification for your test.
这是对您的测试的简单修改。
@Test
public void testPropertyFileWatcher() throws Exception {
final File file = new File("testfile");
file.createNewFile();
final AtomicBoolean hasCalled = new AtomicBoolean( );
PropertyFileWatcher propertyFileWatcher =
new PropertyFileWatcher(file)
{
protected void onChange ( final File localFile )
{
hasCalled.set( true );
assertEquals( file, localFile );
}
}
Timer timer = new Timer();
timer.schedule(propertyFileWatcher, 2000);
FileWriter fw = new FileWriter(file);
fw.write("blah");
fw.close();
Thread.sleep(8000);
// check if propertyFileWatcher.onChange was called
assertTrue( hasCalled.get() );
file.delete();
}
