implementationOfTask(':customTask')
            unknownClassloader('CustomTask_Decorated')
        })
        failureDescriptionContains(implementationUnknown {
            additionalTaskAction(':customTask')
            unknownClassloader('CustomTask_Decorated')
        })
        def result = operations.first(SnapshotTaskInputsBuildOperationType).result
        result.hash == null

        }

        UnknownImplementation implementationOfTask(String taskPath) {
            prefix = "Implementation of task '${taskPath}'"
            this
        }

        UnknownImplementation additionalTaskAction(String taskPath) {
            prefix = "Additional action of task '${taskPath}'"
            this
        }

        UnknownImplementation unknownClassloader(String className) {