[squash] review: add common must-call

test/parallel/test-http2-date-header.js

@@ -1,38 +1,38 @@
 'use strict';
 
-require('../common');
+const common = require('../common');
 const assert = require('assert');
 const http2 = require('http2');
 
 const testResBody = 'other stuff!\n';
 
-const server = http2.createServer((req, res) => {
+const server = http2.createServer(common.mustCall((req, res) => {
   assert.ok(!('date' in req.headers),
             'Request headers did not contain a date.');
   res.writeHead(200, {
     'Content-Type': 'text/plain'
   });
   res.end(testResBody);
-});
+}));
 server.listen(0);
 
-server.on('listening', function() {
+server.on('listening', common.mustCall(function() {
   const client = http2.connect(`http://localhost:${this.address().port}`);
 
   const headers = { ':path': '/' };
   const req = client.request(headers).setEncoding('utf8');
 
-  req.on('response', (headers) => {
+  req.on('response', common.mustCall((headers) => {
     assert.ok('date' in headers,
               'Response headers contain a date.');
 
     req.resume();
-  });
+  }));
 
-  req.on('end', () => {
+  req.on('end', common.mustCall(() => {
     server.close();
     process.exit();
-  });
+  }));
 
   req.end();
-});
+}));