test-ranap: Add test case about constrained integer range decode

There was a bug in the asn1c/libffasn1c APER patch that caused
constrained integer ranges to be decoded incorrectly.  Add a test
case for that to avoid people falling into that trap...
diff --git a/src/tests/test-ranap.ok b/src/tests/test-ranap.ok
index 430535c..63ad1f3 100644
--- a/src/tests/test-ranap.ok
+++ b/src/tests/test-ranap.ok
@@ -9,6 +9,8 @@
 Encoded MaxBitRate 65536 to 40 ff ff 
 Encoded MaxBitRate 65537 to 80 01 00 00 
 Encoded MaxBitRate 16000000 to 80 f4 23 ff 
+Encoded Cause Misc=115 to 42 
+Decoded Cause Misc=115
 
 ==> DIRECT TRANSFER
 <RANAP_IE>