@BeforeAll
    static void beforeAll() {
        channel = InProcessChannelBuilder.forName("test").build();
        stub = TestServiceGrpc.newFutureStub(channel);
    }
Tests for {@link GrpcServerLifecycle}'s shutdown behavior using an in-process server/channel.
tests/src/test/java/net/devh/boot/grpc/test/shutdown/GrpcServerLifecycleWithCallsTest.java