[THRIFT-4771] add nodejs THeaderProtocol support (#1743)

Client: nodejs
diff --git a/lib/nodejs/test/helpers.js b/lib/nodejs/test/helpers.js
index 72d128d..f3c27b3 100644
--- a/lib/nodejs/test/helpers.js
+++ b/lib/nodejs/test/helpers.js
@@ -28,7 +28,8 @@
 module.exports.protocols = {
   json: thrift.TJSONProtocol,
   binary: thrift.TBinaryProtocol,
-  compact: thrift.TCompactProtocol
+  compact: thrift.TCompactProtocol,
+  header: thrift.THeaderProtocol
 };
 
 module.exports.ecmaMode = process.argv.includes("--es6") ? "es6" : "es5";