test(ci): add early supported node versions to test matrix (#705)

Early versions of Node.js 8 had a regression around the handling of
`null` as the port passed to `Server#listen()`. For details see:

nodejs/node#14221

.travis.yml

@@ -25,9 +25,13 @@ before_script:
 
 node_js:
   - '11'
+  - '11.0'
   - '10'
+  - '10.0'
   - '8'
+  - '8.1'
   - '6'
+  - '6.0'
 
 jobs:
   fast_finish: true

test/.jenkins_nodejs.yml

@@ -1,5 +1,9 @@
 NODEJS_VERSION:
   - "11"
+  - "11.0"
   - "10"
+  - "10.0"
   - "8"
+  - "8.1"
   - "6"
+  - "6.0"

test/instrumentation/modules/restify.js

@@ -39,7 +39,7 @@ test('transaction name', function (t) {
 
   // NOTE: Hostname must be supplied to force IPv4 mode,
   // otherwise this will use IPv6, which fails on Travis CI.
-  server.listen(null, '0.0.0.0', function () {
+  server.listen(0, '0.0.0.0', function () {
     const req = http.get(`${server.url}/hello/world`, res => {
       t.equal(res.statusCode, 200, 'server should respond with status code 200')
       const chunks = []
@@ -96,7 +96,7 @@ test('error reporting', function (t) {
 
   // NOTE: Hostname must be supplied to force IPv4 mode,
   // otherwise this will use IPv6, which fails on Travis CI.
-  server.listen(null, '0.0.0.0', function () {
+  server.listen(0, '0.0.0.0', function () {
     const req = http.get(`${server.url}/hello/world`, res => {
       t.equal(res.statusCode, 500, 'server should respond with status code 500')
       res.resume()
@@ -149,7 +149,7 @@ test('error reporting from chained handler', function (t) {
 
   // NOTE: Hostname must be supplied to force IPv4 mode,
   // otherwise this will use IPv6, which fails on Travis CI.
-  server.listen(null, '0.0.0.0', function () {
+  server.listen(0, '0.0.0.0', function () {
     const req = http.get(`${server.url}/hello/world`, res => {
       t.equal(res.statusCode, 500, 'server should respond with status code 500')
       res.resume()
@@ -211,7 +211,7 @@ test('error reporting from chained handler given as array', function (t) {
 
   // NOTE: Hostname must be supplied to force IPv4 mode,
   // otherwise this will use IPv6, which fails on Travis CI.
-  server.listen(null, '0.0.0.0', function () {
+  server.listen(0, '0.0.0.0', function () {
     const req = http.get(`${server.url}/hello/world`, res => {
       t.equal(res.statusCode, 500, 'server should respond with status code 500')
       res.resume()