java.lang.NullPointerException: Cannot invoke "org.springframework.messaging.SubscribableChannel.send(org.springframework.messaging.Message)" because the return value of "org.springframework.cloud.stream.binder.test.InputDestination.getChannelByName(String)" is null

Using spring boot starter version: 3.5.6, spring.cloud.version 2025.0.0

tried everything but getting by setting setting

@TestPropertySource(properties = "spring.cloud.function.definition=getABCDetailsRequest-in-0")

harcoded destination name inputDestination.send(message, "getABCDetailsRequest-in-0") null only. any help is appreciated.