After some discussion it was found that assertEquals is more common
in JS (vs assertEqual, assertEq) and sounds better in the negated form:
assertNotEquals vs assertNE.
Original: 4cf39d4a14
* Use assert.equal instead of deprecated assertEqual
* Replace let with const where possible
* Add WebSocketMessage type
* Use OpCode in WebSocketFrame
* Use const where possible in WS
* Separate sha1 tests, use const instead of let
Original: 385f866a54
