Add test for receiving a text frame on a client.
Add test for receiving a text frame on a client.

Receiving a text frame on a client is done without masking.

gatzka/cjet,gatzka/cjet,mloy/cjet,mloy/cjet,mloy/cjet,gatzka/cjet,mloy/cjet,gatzka/cjet,gatzka/cjet,mloy/cjet