[GithubGistLastCommit] GitHub gist last commit (#8272)

* Add github-gist-last-commit.service.js

* Still having difficulty with the reponse in the test file for github-gist-last-commit  being in svg format, rather than json

* Yay, tests are greeeeen, the best sight for sore eyes xD

* Apply suggestions from code review - destructuring+rename and path change

Co-authored-by: Caleb Cartwright <calebcartwright@users.noreply.github.com>

* Removed the unnecessary test from github-gist-last-commit

Co-authored-by: Caleb Cartwright <calebcartwright@users.noreply.github.com>

services/github/github-gist-last-commit.service.js

@@ -0,0 +1,47 @@
+import Joi from 'joi'
+import { formatDate } from '../text-formatters.js'
+import { age as ageColor } from '../color-formatters.js'
+import { GithubAuthV3Service } from './github-auth-service.js'
+import { documentation, errorMessagesFor } from './github-helpers.js'
+
+const schema = Joi.object({
+  updated_at: Joi.string().required(),
+}).required()
+
+export default class GithubGistLastCommit extends GithubAuthV3Service {
+  static category = 'activity'
+  static route = { base: 'github-gist/last-commit', pattern: ':gistId' }
+  static examples = [
+    {
+      title: 'GitHub Gist last commit',
+      namedParams: {
+        gistId: '8710649',
+      },
+      staticPreview: this.render({ commitDate: '2022-07-29T20:01:41Z' }),
+      keywords: ['latest'],
+      documentation,
+    },
+  ]
+
+  static defaultBadgeData = { label: 'last commit' }
+
+  static render({ commitDate }) {
+    return {
+      message: formatDate(commitDate),
+      color: ageColor(Date.parse(commitDate)),
+    }
+  }
+
+  async fetch({ gistId }) {
+    return this._requestJson({
+      url: `/gists/${gistId}`,
+      schema,
+      errorMessages: errorMessagesFor('gist not found'),
+    })
+  }
+
+  async handle({ gistId }) {
+    const { updated_at: commitDate } = await this.fetch({ gistId })
+    return this.constructor.render({ commitDate })
+  }
+}

services/github/github-gist-last-commit.tester.js

@@ -0,0 +1,24 @@
+import { createServiceTester } from '../tester.js'
+export const t = await createServiceTester()
+
+t.create('last commit in gist (ancient)').get('/871064.json').expectBadge({
+  label: 'last commit',
+  message: 'september 2015',
+  color: 'red',
+})
+
+// not checking the color badge, since in August 2022 it is orange but later it will become red
+t.create('last commit in gist (still ancient but slightly less so)')
+  .get('/870071abadfd66a28bf539677332f12b.json')
+  .expectBadge({
+    label: 'last commit',
+    message: 'october 2020',
+  })
+
+t.create('last commit in gist (gist not found)')
+  .get('/55555555555555.json')
+  .expectBadge({
+    label: 'last commit',
+    message: 'gist not found',
+    color: 'red',
+  })