@Nonnull
    private static FileServiceException newFileServiceException() {
        // Remove the stack trace so we do not pollute the build log.
        return Exceptions.clearTrace(new FileServiceException());
    }
This tests when multiple thrift service implementations, with same service method are added under
default("") service name then the thrift service that is added first should handle the request.
And also makes sure that adding a duplicate service does not break other services.
thrift/thrift0.13/src/test/java/com/linecorp/armeria/server/thrift/ThriftServiceTest.java