Added test/protocol links

Author: Josema

test/protocol/call.js

@@ -0,0 +1,4 @@
+try {
+    eval('async () => {}')
+    require('../ES6/call')
+} catch (e) {}

test/protocol/subscribe.js

@@ -0,0 +1,4 @@
+try {
+    eval('async () => {}')
+    require('../ES6/subscribe')
+} catch (e) {}