Tests never get executed because of the Mockito.doThrow

Issue

I am testing an anroid app using Mockito. I want to test an exception case, but the method Mockito.doThrow hangs and the test never gets executed (it neither fails nor succeeds).

Here's the code. PackageDownloader represents an AsyncTask. Its method get gets called inside of the downloadPackage method. But the execution never comes to that point because it hangs exactly on doThrow line.

PackageDownloader packageDownloader = new PackageDownloader();
PackageDownloader mockPackageDownloader = Mockito.spy(packageDownloader);
HttpURLConnection connectionMock = Mockito.mock(HttpURLConnection.class);
Mockito.doReturn(connectionMock)
       .when(mockPackageDownloader)
       .createConnection(Mockito.any(URL.class));
Mockito.doThrow(new InterruptedException()).when(mockPackageDownloader).get();
downloadPackage();

Solution

So it turned out I was trying to stub a final method (which is, if you look at the definition, AsyncTask.get()). With Mockito, it's impossible to mock final methods. The problem is I wasn't able to find out why the code hangs, and this is certainly a Mockito fault.

I found out the issue by placing doThrow after the downloadPackage method call.

Answered By - annaoomph