chore: add missing use strict directives

templates/plugin/test/index.test.js

@@ -1,3 +1,5 @@
+'use strict'
+
 const { test } = require('tap')
 
 test('should register the correct decorator', async t => {

test/args.test.js

@@ -1,3 +1,5 @@
+'use strict'
+
 const t = require('tap')
 const test = t.test
 const parseArgs = require('../args')

test/data/custom-config.js

@@ -1,3 +1,5 @@
+'use strict'
+
 module.exports = {
   port: 5000,
   address: 'fastify.io:9999',

test/data/custom-logger.js

@@ -1,3 +1,5 @@
+'use strict'
+
 module.exports = {
   name: 'Custom Logger',
   customLevels: {

test/data/object.js

@@ -1 +1,3 @@
+'use strict'
+
 module.exports = {}

test/generate-swagger.test.js

@@ -1,3 +1,5 @@
+'use strict'
+
 const path = require('path')
 const t = require('tap')
 const { test } = t

util.js

@@ -1,3 +1,5 @@
+'use strict'
+
 const fs = require('fs')
 const path = require('path')
 const url = require('url')