@Test
public void downloadVideo_DownloadSuccessful_ReturnsTrue() {

    final String DownloadId = "download_id";
    MockInterceptor okHttpMockInterceptor = new MockInterceptor();
    okHttpMockInterceptor.addRule()
            .get()
            .urlStarts("https://jumpcutter.letum.ch/download?download_id=" + DownloadId)
            .respond("I am video");
    OkHttpClient okHttpClient = new OkHttpClient.Builder()
            .addInterceptor(okHttpMockInterceptor)
            .build();
    FileSystemWrapper fileSystemWrapperMock = Mockito.mock(FileSystemWrapper.class);
    ServerWrapper server = new ServerWrapper(okHttpClient, fileSystemWrapperMock);
    Boolean response = server.downloadVideo(DownloadId);
    Assert.assertEquals(true, response);
}