Use Node test runner

package.json

@@ -24,9 +24,8 @@
   },
   "scripts": {
     "lint": "standard",
-    "test": "ava",
-    "test:watch": "ava --watch",
-    "coverage": "c8 ava"
+    "test": "NODE_ENV=test node --test",
+    "coverage": "NODE_ENV=test node --test --experimental-test-coverage"
   },
   "publishConfig": {
     "access": "public"
@@ -35,19 +34,11 @@
     "lodash": "^4.17.21"
   },
   "devDependencies": {
-    "ava": "^4.0.1",
-    "c8": "^7.11.0",
     "nhsuk-frontend": "^6.1.2",
     "nunjucks": "^3.2.3",
     "standard": "^17.0.0"
   },
   "engines": {
     "node": ">=20"
-  },
-  "c8": {
-    "reporter": [
-      "text",
-      "lcovonly"
-    ]
   }
 }

test/lib/decorate.js

@@ -0,0 +1,131 @@
+const assert = require('node:assert/strict')
+const test = require('node:test')
+const nunjucks = require('nunjucks')
+const { decorate } = require('../../lib/decorate.js')
+
+const env = nunjucks.configure([
+  './',
+  './node_modules/nhsuk-frontend/packages/components',
+  './test/fixtures'
+])
+env.addGlobal('decorate', decorate)
+
+const data = {
+  data: {
+    account: {
+      'email-address': '[email protected]'
+    },
+    country: 'england',
+    'passport-issued': {
+      day: '31',
+      month: '12',
+      year: '1999'
+    },
+    status: 'published'
+  }
+}
+
+test('Returns form component without decorate attribute', () => {
+  const result = env.render('input-not-decorated.njk', data)
+
+  assert.match(result, /id=""/)
+  assert.match(result, /name=""/)
+})
+
+test('Returns form component without any session data', () => {
+  const result = env.render('input.njk', {})
+
+  assert.match(result, /id=""/)
+  assert.match(result, /name=""/)
+})
+
+test('Decorates form component', t => {
+  const result = env.render('input.njk', data)
+
+  assert.match(result, /for="account-email-address"/)
+  assert.match(result, /id="account-email-address"/)
+  assert.match(result, /name="\[account\]\[email-address\]"/)
+  assert.match(result, /value="test@example.org"/)
+})
+
+test('Decorates form component with items', () => {
+  const result = env.render('radios.njk', data)
+
+  assert.match(result, /for="country-1"/)
+  assert.match(result, /for="country-2"/)
+  assert.match(result, /id="country-1".*name="\[country\].*value="england".*checked/)
+  assert.match(result, /id="country-2".*name="\[country\].*value="scotland"/)
+})
+
+test('Decorates form component with items (data stored in array)', () => {
+  const result = env.render('radios.njk', {
+    data: { country: ['england'] }
+  })
+
+  assert.match(result, /for="country-1"/)
+  assert.match(result, /for="country-2"/)
+  assert.match(result, /id="country-1".*name="\[country\].*value="england".*checked/)
+  assert.match(result, /id="country-2".*name="\[country\].*value="scotland"/)
+})
+
+test('Decorates button component', () => {
+  const result = env.render('button.njk', data)
+
+  assert.match(result, /name="\[status\]"/)
+  assert.match(result, /value="published"/)
+})
+
+test('Does not decorate button link component', () => {
+  const result = env.render('button-href.njk', data)
+
+  assert.doesNotMatch(result, /name="\[status\]"/)
+  assert.doesNotMatch(result, /value="published"/)
+})
+
+test('Uses label text if no value given for option', () => {
+  const result = env.render('radios-no-values.njk', data)
+
+  assert.match(result, /id="country-1".*name="\[country\].*value="England"/)
+  assert.match(result, /id="country-2".*name="\[country\].*value="Scotland"/)
+  assert.match(result, /id="country-3".*name="\[country\].*value="Wales"/)
+  assert.match(result, /id="country-4".*name="\[country\].*value="Northern Ireland"/)
+  assert.match(result, /id="country-6".*name="\[country\].*value="Another country"/)
+})
+
+test('Decorates date input component', () => {
+  const result = env.render('date-input.njk', data)
+
+  assert.match(result, /for="passport-issued-day"/)
+  assert.match(result, /for="passport-issued-month"/)
+  assert.match(result, /for="passport-issued-year"/)
+  assert.match(result, /id="passport-issued-day".*name="\[passport-issued\]\[day\].*value="31"/)
+  assert.match(result, /id="passport-issued-month".*name="\[passport-issued\]\[month\].*value="12"/)
+  assert.match(result, /id="passport-issued-year".*name="\[passport-issued\]\[year\].*value="1999"/)
+})
+
+test('Strips data from key path', () => {
+  const result = env.render('input-data-in-key-path.njk', data)
+
+  assert.match(result, /for="account-email-address"/)
+  assert.match(result, /id="account-email-address"/)
+  assert.match(result, /name="\[account\]\[email-address\]"/)
+  assert.match(result, /value="test@example.org"/)
+})
+
+test('Add message if error', () => {
+  const result = env.render('input.njk', {
+    ...data,
+    ...{
+      errors: {
+        'account.email-address': {
+          msg: 'Enter an email address in the correct format'
+        }
+      }
+    }
+  })
+
+  assert.match(result, /id="account-email-address-error"/)
+  assert.match(result, /Error:/)
+  assert.match(result, /Enter an email address in the correct format/)
+  assert.match(result, /aria-describedby="account-email-address-error"/)
+})