diff --git a/data/pubkey/osnma/OSNMA_PublicKey_test.crt b/data/pubkey/osnma/OSNMA_PublicKey_test.crt
new file mode 100644
index 0000000..218c897
--- /dev/null
+++ b/data/pubkey/osnma/OSNMA_PublicKey_test.crt
@@ -0,0 +1,29 @@
+-----BEGIN CERTIFICATE-----
+MIICbDCCAhKgAwIBAgIQR8TxQ8P6YaUpTmPVVysBYjAKBggqhkjOPQQDAjA3MQsw
+CQYDVQQGEwJFUzEOMAwGA1UECgwFRVVTUEExGDAWBgNVBAMMD0VVU1BBIE9TTk1B
+IElDQTAeFw0yMzA3MjAxMTIyMzBaFw0yNTA4MDgxMTMzMDBaMDoxCzAJBgNVBAYT
+AkVTMQ4wDAYDVQQKDAVFVVNQQTEbMBkGA1UEAwwSRVVTUEEgT1NOTUEgRUUgUEtS
+MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEA7LOZLwge92LxN+FkYf8toYyDWP/
+oJFBD8FY+7d5gOqIaE2RjPAnKI68s/OK/HPgoLkO2ijQ8xAZyDdPB1dHSaOB/DCB
++TAdBgNVHQ4EFgQUaiIWWJsjyUNBPLb4nZMP4P5qPFQwHwYDVR0jBBgwFoAUIMBU
+ha+CrpY8vN/BuQXe10ZyMqMwYwYDVR0gBFwwWjBOBgsrBgEEAYPVEQEBATA/MD0G
+CCsGAQUFBwIBFjFodHRwczovL3d3dy5nc2MtZXVyb3BhLmV1L2dzYy1wcm9kdWN0
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+UenYuwqyTIplUnmfQ/YCIBBlL2r4JiBC/wlr0I0LdRUkv+T+YMNuLTEy7WVsXIsU
+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
+MIICMjCCAdigAwIBAgIUVmo7J+pBUUDP2fWjLPvDvY2HSIcwCgYIKoZIzj0EAwIw
+NzELMAkGA1UEBhMCRVMxDjAMBgNVBAoMBUVVU1BBMRgwFgYDVQQDDA9FVVNQQSBP
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+QTBZMBMGByqGSM49AgEGCCqGSM49AwEHA0IABE+Z3W0RHPYZfUolnhAUp4tRBSmv
+1xdSZRhdcmYowNpc15N+x7xmDiYGPQwSBufoH2zU6HWp2bEpQhLEn1qeRhyjgcEw
+gb4wHQYDVR0OBBYEFCDAVIWvgq6WPLzfwbkF3tdGcjKjMB8GA1UdIwQYMBaAFCDA
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+dXJvcGEuZXUvZ3NjLXByb2R1Y3RzL09TTk1BL1BLSS8wDgYDVR0PAQH/BAQDAgEG
+MAoGCCqGSM49BAMCA0gAMEUCIQDIwR/ODYlDt5WMFjuJIxtgDePgOWdXda2Mx/7/
+ZorpKgIgQ/vrSy9PUxkO116V8HWJN7l05FSpVkqW9fwZNVYnoLU=
+-----END CERTIFICATE-----
diff --git a/samples/test_osnma.py b/samples/test_osnma.py
index 43a3278..4242a45 100644
--- a/samples/test_osnma.py
+++ b/samples/test_osnma.py
@@ -11,8 +11,9 @@
 import matplotlib.pyplot as plt
 
 tofst = -2  # time offset to syncronize tow
+mt_file = 'OSNMA_MerkleTree_20240115100000_newPKID_1.xml'
 
-nma = om.osnma()
+nma = om.osnma(mt_file)
 
 nma.flg_slowmac = True