Th problem comes with the fact that you are trying...

# kodein

[salomonbrys]

Th problem comes with the fact that you are trying to get a Bus<in T>, and not a Bus<in ExecutorTest.TestTaskContext>. In essence, T is not reified.
I understand why you are doing this but, unfortunately, there's no easy way to do this in Kodein... properly.
A "simple" hack would be to bind and retrieve Bus<*>, then cast it to Bus<in T>.