Add test helper utility in TypeScript template (#554)

* Add test helper utility in TypeScript template

* Increase tap's `--timeout` flag to `300`

package.json

@@ -9,7 +9,7 @@
   "scripts": {
     "lint": "standard",
     "lint:fix": "standard --fix",
-    "unit": "tap \"test/**/*.test.{js,ts}\" \"templates/**/*.test.{js,ts}\" --timeout 120",
+    "unit": "tap \"test/**/*.test.{js,ts}\" \"templates/**/*.test.{js,ts}\" --timeout 300",
     "pretest": "xcopy /e /k /i . \"..\\node_modules\\fastify-cli\" || rsync -r --exclude=node_modules ./ node_modules/fastify-cli || echo 'this is fine'",
     "test": "npm run lint && npm run unit && npm run test:typescript",
     "test:typescript": "tsd templates/plugin && tsc --project templates/app-ts/tsconfig.json && del-cli templates/app-ts/dist"

templates/app-ts/test/helper.ts

@@ -1,11 +1,12 @@
 // This file contains code that we reuse between our tests.
-import Fastify from 'fastify'
-import fp from 'fastify-plugin'
-import App from '../src/app'
+const helper = require('fastify-cli/helper.js')
+import * as path from 'path'
 import * as tap from 'tap';
 
 export type Test = typeof tap['Test']['prototype'];
 
+const AppPath = path.join(__dirname, '..', 'src', 'app.ts')
+
 // Fill in this config with all the configurations
 // needed for testing the application
 async function config () {
@@ -14,14 +15,13 @@ async function config () {
 
 // Automatically build and tear down our instance
 async function build (t: Test) {
-  const app = Fastify()
+  // you can set all the options supported by the fastify CLI command
+  const argv = [AppPath]
 
   // fastify-plugin ensures that all decorators
   // are exposed for testing purposes, this is
   // different from the production setup
-  void app.register(fp(App), await config())
-
-  await app.ready();
+  const app = await helper.build(argv, await config())
 
   // Tear down our app after we are done
   t.teardown(() => void app.close())