change successful test status from <=300 to < 300

tests/index.test.cjs

@@ -0,0 +1,65 @@
+const { readdir, stat, readFile } = require('fs/promises')
+const test = require('brittle')
+const path = require('path')
+const https = require('https')
+
+test('check that all urls can be reached', async (t) => {
+  const docs = await readMarkdownFiles()
+
+  let urls = await Promise.all(docs.map(async (doc) => {
+    const content = (await readFile(doc)).toString()
+    const urlRegex = /(?<url>https?:\/\/[^\s)"'`]+)/gi
+    return content.match(urlRegex)
+  }))
+
+  urls = urls.flat().filter(u => u !== null).filter(u => !u.startsWith('http://localhost'))
+
+  const cache = new Map()
+  const responses = await Promise.all(urls.map(async url => {
+    if (cache.get(url)) return cache.get(url)
+    const result = await checkUrl(url.trim())
+    cache.set(url, result)
+    return { result, url }
+  }))
+
+  for (const response of responses) {
+    t.ok(response.result, `${response.url} should return 200 code`)
+  }
+})
+
+async function readMarkdownFiles (folderPath = path.join(__dirname, '..')) {
+  let result = []
+  const files = await readdir(folderPath)
+
+  for (const file of files) {
+    const filePath = path.join(folderPath, file)
+    const stats = await stat(filePath)
+
+    if (!filePath.includes('node_modules') && stats.isDirectory()) {
+      result = result.concat(await readMarkdownFiles(filePath))
+    } else if (path.extname(filePath) === '.md') {
+      result.push(filePath)
+    }
+  }
+
+  return result
+}
+
+function checkUrl (url) {
+  return new Promise((resolve, reject) => {
+    try {
+      https.get(url, (res) => {
+        if (res.statusCode >= 200 && res.statusCode < 300) {
+          resolve(true)
+        } else {
+          resolve(false)
+        }
+      }).on('error', () => {
+        resolve(false)
+      })
+    } catch (err) {
+      console.log(err)
+      resolve(false)
+    }
+  })
+}