private void assertCompleted(final AtomicReference<Future<SomeType>> request) {
        assertFutureEquals(SOME_TYPE, request.get(), A_BIT_TIME, MILLISECONDS);
    }
Tests for {@link InProcessChannelFactory}'s shutdown behavior using an in-process server/channel.
tests/src/test/java/net/devh/boot/grpc/test/shutdown/GrpcChannelLifecycleWithCallsTest.java