[test][loop_executor] Add algorithm validation

beat/backend/python/test/test_loop_executor.py

@@ -187,11 +187,13 @@ class TestExecution(unittest.TestCase):
             os.makedirs(working_prefix)
 
         algorithm = Algorithm(prefix, algorithm_name)
+        assert(algorithm.valid)
         algorithm.export(working_prefix)
 
         # -------------------------------------------------------------------------
 
         loop_algorithm = Algorithm(prefix, loop_algorithm_name)
+        assert(loop_algorithm.valid)
         loop_algorithm.export(working_prefix)
 
         # -------------------------------------------------------------------------