warning test on deprecate request.connection usage

test/emit-warning.test.js

@@ -3,6 +3,7 @@
 const sget = require('simple-get').concat
 const { test } = require('tap')
 const Fastify = require('..')
+const semver = require('semver')
 
 process.removeAllListeners('warning')
 
@@ -129,3 +130,33 @@ test('Should emit a warning when using payload less preParsing hook', t => {
     })
   })
 })
+
+if (semver.gte(process.versions.node, '13.0.0')) {
+  test('Should emit a warning when accessing request.connection instead of request.socket on Node process greater than 13.0.0', t => {
+    t.plan(4)
+
+    process.on('warning', onWarning)
+    function onWarning (warning) {
+      t.strictEqual(warning.name, 'FastifyDeprecation')
+      t.strictEqual(warning.code, 'FSTDEP005')
+      t.strictEqual(warning.message, 'You are accessing the deprecated "request.connection" property. Use "request.socket" instead.')
+
+      // removed listener before light-my-request emit second warning
+      process.removeListener('warning', onWarning)
+    }
+
+    const fastify = Fastify()
+
+    fastify.get('/', (request, reply) => {
+      reply.send(request.connection)
+    })
+
+    fastify.inject({
+      method: 'GET',
+      path: '/'
+    }, (err, res) => {
+      t.error(err)
+      process.removeListener('warning', onWarning)
+    })
+  })
+}