diff --git a/tests/test_files.py b/tests/test_files.py
index 3fb1062..fe520fb 100755
--- a/tests/test_files.py
+++ b/tests/test_files.py
@@ -29,6 +29,7 @@
 import pySim.ts_51_011
 import pySim.sysmocom_sja2
 import pySim.gsm_r
+import pySim.cdma_ruim
 
 def get_qualified_name(c):
     """return the qualified (by module) name of a class."""