我正在尝试测试在AsyncTask
内部触发的监听器回调,
Listener类:
interface LoaderListener {
fun onByteSuccess(..., ..., ...)
fun onByteFailure(..., ...)
}
包含AsyncTask的类:
class Loader {
override fun handleStreamTask(){
InputStreamHandlingTask(..., ...).execute(byteArray)
}
private inner class InputStreamHandlingTask constructor(
internal var ...,
internal var ...
) : AsyncTask<ByteArray, Void, ByteArray>() {
override fun doInBackground(vararg params: ByteArray): ByteArray? {
val response = params[0]
.....
return response
}
override fun onPostExecute(byteArray: ByteArray?) {
if (byteArray != null) {
listener.onByteSuccess(..., ..., ...)
} else {
listener.onByteFailure(..., ...)
}
}
}
}
我要进行的测试:
@Test
fun testIfListenerCalled(){
val loader: Loader = mock()
val loaderListener: LoaderListener = mock()
loader.handleStreamTask()
verify(loaderListener).onByteSuccess(..., ..., ...)
}
我当前遇到的错误:
线程中的异常... java.lang.RuntimeException:未模拟android.os.AsyncTask中执行的方法。有关详情,请参见http://g.co/androidstudio/not-mocked。 在android.os.AsyncTask.execute(AsyncTask.java)上
答案 0 :(得分:1)
如果这是在本地计算机上而不是在Android设备上运行的单元测试,则不能模拟依赖于Android框架的类,例如AsyncTask
。取而代之的是,应将其实现为有工具的测试,而不是在Android设备上运行的单元测试或使用可在本地计算机上模拟Android框架的框架。
此处有更多信息:https://developer.android.com/training/testing/unit-testing/instrumented-unit-tests
答案 1 :(得分:0)
下面的示例演示了如何在JUnit中测试Asynctasks。
/**
* @throws Throwable
*/
public void testAsynTask () throws Throwable {
// create a signal to let us know when our task is done.
final CountDownLatch signal = new CountDownLatch(1);
/* Just create an in line implementation of an asynctask. Note this
* would normally not be done, and is just here for completeness.
* You would just use the task you want to unit test in your project.
*/
final AsyncTask<String, Void, String> myTask = new AsyncTask<String, Void, String>() {
@Override
protected String doInBackground(String... arg0) {
//Your code to run in background thread.
return "Expected value from background thread.";
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
/* This is the key, normally you would use some type of listener
* to notify your activity that the async call was finished.
*
* In your test method you would subscribe to that and signal
* from there instead.
*/
signal.countDown();
}
};
// Execute the async task on the UI thread! THIS IS KEY!
runTestOnUiThread(new Runnable() {
@Override
public void run() {
myTask.execute("Do something");
}
});
/* The testing thread will wait here until the UI thread releases it
* above with the countDown() or 30 seconds passes and it times out.
*/
signal.await(30, TimeUnit.SECONDS);
// The task is done, and now you can assert some things!
assertTrue("Expected Value", true);
}